diff --git a/ChangeLog b/ChangeLog
index ab07aff..85719d3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+0.4.4 - 2022-03-00
+    * SSHD master/NameSpace fix
+    * Redis via unix domain socket only
 0.4.3 - 2022-02-21
     * kali-linux-everything
     * sshd to user's network namespace
diff --git a/Makefile b/Makefile
index 73a08a8..b352569 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-VER := 0.4.3rc2
+VER := 0.4.4a
 
 all:
 	make -C router
diff --git a/config/etc/redis/redis.conf b/config/etc/redis/redis.conf
index e6bc58d..cba6e34 100644
--- a/config/etc/redis/redis.conf
+++ b/config/etc/redis/redis.conf
@@ -5,5 +5,6 @@ rename-command CONFIG ""
 rename-command MONITOR ""
 # COMMAND DOCS causes huge network traffic: redis-cli issues this for every connect. DENY IT.
 rename-command COMMAND ""
-#unixsocket /dev/shm/redis/redis.sock
+unixsocketperm 777
+unixsocket /redis-sock/redis.sock
 
diff --git a/docker-compose.yml b/docker-compose.yml
index cc54386..abf31b5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,15 +10,11 @@ services:
     cgroup_parent: sf.slice
     environment:
       - SF_REDIS_AUTH=${SF_REDIS_AUTH}
-    networks:
-      redis-net:
-        ipv4_address: ${SF_REDIS_IP}
-      master-net:
-        ipv4_address: ${SF_NET_MASTER_REDIS_IP}
+    network_mode: none
     command: [ "redis-server", "/redis.conf",  "--save", "\"\"", "--appendonly", "no", "--requirepass", "${SF_REDIS_AUTH}" ]
     volumes:
       - "${SF_BASEDIR:-.}/config/etc/redis/redis.conf:/redis.conf:ro"
-      # - "${SF_SHMDIR:-/dev/shm/sf}/redis:/dev/shm/redis"
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
 
   sf-encfsd:
     build: encfsd
@@ -37,12 +33,11 @@ services:
     # NOTE: _MUST_ not run in host's pid space because we use 'pgrep' to find lg's encfsd pid.
     environment:
       - SF_REDIS_AUTH=${SF_REDIS_AUTH}
-      - SF_REDIS_IP=${SF_REDIS_IP}
+      # - SF_REDIS_IP=${SF_REDIS_IP}
       - SF_SEED=${SF_SEED}
       - SF_DEBUG
     command: ["/encfsd.sh"]
-    networks:
-      redis-net:
+    network_mode: none
     devices:
       - "/dev/fuse:/dev/fuse"
     volumes:
@@ -53,6 +48,7 @@ services:
       - "${SF_SHMDIR:-/dev/shm/sf}/run/encfsd/user:/sf/run/encfsd/user"
       - "${SF_BASEDIR:-.}/sfbin:/sf/bin:ro"
       - "${SF_OVERLAYDIR:-/var/lib/docker/overlay2}:/var/lib/docker/overlay2:ro"
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
       - "/sys/fs/cgroup:/sys/fs/cgroup"
 
   # Note: If this one fails to start then most likelly bad ENCFS password.
@@ -72,12 +68,10 @@ services:
       - apparmor:unconfined
     environment:
       - SF_REDIS_AUTH=${SF_REDIS_AUTH:?}
-      - SF_REDIS_IP=${SF_REDIS_IP}
       - SF_DEBUG
     pid: "service:sf-encfsd"
     command: ["/destructor.sh"]
-    networks:
-      redis-net:
+    network_mode: none
     devices:
       - "/dev/fuse:/dev/fuse"
     volumes:
@@ -85,6 +79,7 @@ services:
       - "${SF_BASEDIR:-.}/data:/encfs/raw"
       - "${SF_SHMDIR:-/dev/shm/sf}/encfs-sec:/encfs/sec:shared"
       - "${SF_SHMDIR:-/dev/shm/sf}/run/encfsd/user/:/sf/run/encfsd/user"
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
       - "/var/run/docker.sock:/var/run/docker.sock"
       - "${SF_BASEDIR:-.}/sfbin:/sf/bin:ro"
 
@@ -97,9 +92,10 @@ services:
     pid: "host"
     cap_add:
     - SYS_PTRACE # access to /proc/<PID>/root/dev/pts/* to send messages to user.
+    network_mode: none
     volumes:
     - "/var/run/docker.sock:/var/run/docker.sock"
-    - "/var/run/containerd/io.containerd.runtime.v2.task:/var/run/containerd/io.containerd.runtime.v2.task"
+    - "/var/run/containerd/io.containerd.runtime.v2.task:/var/run/containerd/io.containerd.runtime.v2.task:ro"
     - "${SF_BASEDIR:-.}/config:${SF_BASEDIR:-.}/config"
     - "/sys/fs/cgroup:/sys/fs/cgroup"
 
@@ -113,13 +109,12 @@ services:
       - sf-redis
     environment:
       - SF_REDIS_AUTH=${SF_REDIS_AUTH}
-      - SF_REDIS_IP=${SF_REDIS_IP}
       - SF_DEBUG
     command: ["/portd.sh"]
-    networks:
-      redis-net:
+    network_mode: none
     volumes:
       - "${SF_SHMDIR:-/dev/shm/sf}/self-for-guest:/config/self-for-guest"
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
       - "/var/run/docker.sock:/var/run/docker.sock"
       - "${SF_BASEDIR:-.}/sfbin:/sf/bin:ro"
 
@@ -168,14 +163,10 @@ services:
       - PRE_DOWN=/sf/bin/vpn_wg2status.sh /sf/run/vpn/status-nordvpn.log down %i
       - RECONNECT=604800 # Re-Connect every 7 days
       - SF_REDIS_AUTH=${SF_REDIS_AUTH}
-      - SF_REDIS_IP=${SF_REDIS_IP}
       - SF_DEBUG
     networks:
       vpn-net:
         ipv4_address: ${SF_NORDVPN_IP}
-      redis-net:
-    extra_hosts:
-      - "sf-redis:${SF_REDIS_IP}"
     sysctls:
       - net.ipv6.conf.all.disable_ipv6=1
       - net.ipv4.conf.all.rp_filter=2
@@ -184,6 +175,7 @@ services:
     volumes:
       - "${SF_SHMDIR:-/dev/shm/sf}/run/vpn:/sf/run/vpn"  # Between all VPNs
       - "${SF_SHMDIR:-/dev/shm/sf}/config-for-guest:/config/guest" # vpn_status to guest
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
       - "${SF_BASEDIR:-.}/sfbin:/sf/bin:ro"
 
   cryptostorm:
@@ -206,14 +198,10 @@ services:
       - PRE_DOWN=/sf/bin/vpn_wg2status.sh /sf/run/vpn/status-cryptostorm.log down %i
       - RECONNECT=604800 # Re-Connect every 7 days
       - SF_REDIS_AUTH=${SF_REDIS_AUTH}
-      - SF_REDIS_IP=${SF_REDIS_IP}
       - SF_DEBUG
     networks:
       vpn-net:
         ipv4_address: ${SF_CRYPTOSTORM_IP}
-      redis-net:
-    extra_hosts:
-      - "sf-redis:${SF_REDIS_IP}"
     sysctls:
       - net.ipv6.conf.all.disable_ipv6=1
       - net.ipv4.conf.all.rp_filter=2
@@ -221,6 +209,7 @@ services:
     volumes:
       - "${SF_SHMDIR:-/dev/shm/sf}/run/vpn:/sf/run/vpn"  # Between all VPNs
       - "${SF_SHMDIR:-/dev/shm/sf}/config-for-guest:/config/guest" # vpn_status to guest
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
       - "${SF_BASEDIR:-.}/sfbin:/sf/bin:ro"
 
   mullvad:
@@ -242,14 +231,10 @@ services:
       - PRE_DOWN=/sf/bin/vpn_wg2status.sh /sf/run/vpn/status-mullvad.log down %i
       - RECONNECT=604800 # Re-Connect every 7 days
       - SF_REDIS_AUTH=${SF_REDIS_AUTH}
-      - SF_REDIS_IP=${SF_REDIS_IP}
       - SF_DEBUG
     networks:
       vpn-net:
         ipv4_address: ${SF_MULLVAD_IP}
-      redis-net:
-    extra_hosts:
-      - "sf-redis:${SF_REDIS_IP}"
     sysctls:
       - net.ipv6.conf.all.disable_ipv6=1
       - net.ipv4.conf.all.rp_filter=2
@@ -257,6 +242,7 @@ services:
     volumes:
       - "${SF_SHMDIR:-/dev/shm/sf}/run/vpn:/sf/run/vpn"  # Between all VPNs
       - "${SF_SHMDIR:-/dev/shm/sf}/config-for-guest:/config/guest" # vpn_status to guest
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
       - "${SF_BASEDIR:-.}/sfbin:/sf/bin:ro"
 
   router:
@@ -336,10 +322,7 @@ services:
     cgroup_parent: sf.slice
     depends_on:
       - sf-redis
-    # network_mode: none  # FIXME: Make redis available via shared socket so we dont need network on 'master'.
-    networks:
-      master-net:
-    # dns: 255.255.255.255
+    network_mode: none
     cap_add:
       - NET_ADMIN
       - SYS_ADMIN   # For nsenter
@@ -349,7 +332,6 @@ services:
       - SF_DEBUG
       - SF_FQDN=${SF_FQDN:-SF_FQDN-NOT-SET.hack.segfault.net}
       - SF_REDIS_AUTH=${SF_REDIS_AUTH}
-      - SF_REDIS_IP=${SF_NET_MASTER_REDIS_IP}
       - SF_RPC_IP=${SF_RPC_IP:?}
       - SF_TOR_IP=${SF_TOR_IP:?}
       - SF_DNS=${SF_NET_VPN_DNS_IP}
@@ -357,14 +339,13 @@ services:
     volumes:
       - "${SF_SHMDIR:-/dev/shm/sf}/master:/dev/shm/master"
       - "${SF_BASEDIR:-.}/config/db:/config/db"
-      # - "${SF_SHMDIR:-/dev/shm/sf}/redis:/dev/shm/redis"
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
       - "${SF_BASEDIR:-.}/config/etc/sf:/config/host/etc/sf:ro"
       - "${SF_BASEDIR:-.}/sfbin:/sf/bin:ro"
       - "/var/run/docker.sock:/var/run/docker.sock"
     entrypoint: ["/init-master.sh"]
 
   rpc:
-    # image: fabiocicerchia/nginx-lua
     image: nginx
     container_name: sf-rpc
     restart: ${SF_RESTART:-on-failure}
@@ -493,7 +474,6 @@ services:
       # WARNING: sshd's port forward/socks can access those networks.
       access-net:
         ipv4_address: ${SF_SSHD_IP}
-      redis-net:
     dns: ${SF_NET_ACCESS_DNS_IP}
     cap_add:
       - NET_ADMIN # need to set default route via sf-router
@@ -516,9 +496,9 @@ services:
       - SF_USER_PASSWORD=${SF_USER_PASSWORD:-segfault}
       - SF_FQDN=${SF_FQDN:-SF_FQDN-NOT-SET.hack.segfault.net}
       - SF_REDIS_AUTH=${SF_REDIS_AUTH}
-      - SF_REDIS_IP=${SF_REDIS_IP}
       - SF_RPC_IP=${SF_RPC_IP}
       - SF_SEED=${SF_SEED}
+      - SF_HM_SIZE_LG=8
       - SF_DEBUG
     volumes:
       - "${SF_BASEDIR:-.}/config:/config/host"
@@ -529,6 +509,8 @@ services:
       - "${SF_SHMDIR:-/dev/shm/sf}/config-for-guest:/config/guest"
       - "${SF_SHMDIR:-/dev/shm/sf}/self-for-guest:/config/self-for-guest:shared"
       - "/var/run/docker.sock:/var/run/docker.sock"
+      - "${SF_SHMDIR:-/dev/shm/sf}/run/redis/sock:/redis-sock"
+      # - /research/segfault/host/fs-root/bin/segfaultsh:/bin/segfaultsh:ro # FIXME-2022
 
   nginx:
     image: nginx
@@ -542,8 +524,6 @@ services:
       dmz-net:
         ipv4_address: ${SF_NGINX_IP}
     dns: 255.255.255.255
-    # cap_add:
-    #   - NET_ADMIN # need to set default route
     volumes:
       - "${SF_BASEDIR:-.}/sfbin/wait_semaphore.sh:/sf/bin/wait_semaphore.sh:ro"
       - "${SF_SHMDIR:-/dev/shm/sf}/encfs-sec/www-root:/sec:slave,ro"
@@ -582,22 +562,6 @@ networks:
       config:
         - subnet: ${SF_NET_DMZ}
 
-  redis-net:
-    name: sf-redis-net
-    driver: bridge
-    internal: true
-    ipam:
-      config:
-        - subnet: ${SF_NET_REDIS}
-
-  master-net:
-    name: sf-master-net
-    driver: bridge
-    internal: true
-    ipam:
-      config:
-        - subnet: ${SF_NET_MASTER}
-
   dns-doh-net:
     name: sf-dns-doh
     driver: bridge
diff --git a/encfsd/destructor.sh b/encfsd/destructor.sh
index 4ba58d0..45fd586 100755
--- a/encfsd/destructor.sh
+++ b/encfsd/destructor.sh
@@ -28,6 +28,7 @@ stop_lg()
 
 	red RPUSH portd:cmd "remport ${lid}" >/dev/null
 	rm -f "/sf/run/encfsd/user/lg-${lid}"
+	rm -f "/sf/run/pids/lg-${lid}.pid"
 
 	# Tear down container
 	[[ -n $is_container ]] && docker stop "lg-$lid" &>/dev/nuill
diff --git a/guest/Dockerfile b/guest/Dockerfile
index 2d54ce1..1b40cfa 100644
--- a/guest/Dockerfile
+++ b/guest/Dockerfile
@@ -497,6 +497,7 @@ RUN /pkg-install.sh EMU apt-get install -y --no-install-recommends \
 		fs-uae fs-uae-arcade \
 		vice
 RUN /pkg-install.sh HUGE apt-get install -y --no-install-recommends \
+	maven \
 	rust-src
 RUN /pkg-install.sh HACK ghbin shadow1ng/fscan 'amd64$' fscan \
 	&& /pkg-install.sh HACK ghbin 'theaog/spirit' 'spirit.tgz$' spirit \
@@ -523,7 +524,7 @@ RUN /pkg-install.sh HACK ghbin shadow1ng/fscan 'amd64$' fscan \
 	&& /pkg-install.sh HACK ghbin 'hahwul/dalfox' 'inux_amd64' dalfox \
 	&& /pkg-install.sh HACK ghbin 'pwnesia/dnstake' 'linux_amd64' dnstake \
 	&& /pkg-install.sh HACK bash -c '{ curl -sf https://gobinaries.com/gwen001/gitlab-subdomains | PREFIX=/usr/bin sh; }' \
-	&& /pkg-install.sh HACK bash -c '{ curl -sf https://gobinaries.com/gwen001/github-endpoints | PREFIX=/usr/bin sh; }' \
+	&& /pkg-install.sh HACK bash -c '{ curl -sf https://gobinaries.com/gwen001/github-endpoints | PREFIX=/usr/bin sh; }'
 RUN sed 's/deb-src.*//' -i /etc/apt/sources.list \
 	&& apt-get update
 
diff --git a/host/fs-root/bin/docker_sshd.sh b/host/fs-root/bin/docker_sshd.sh
index 6a6a3f2..e596ee3 100755
--- a/host/fs-root/bin/docker_sshd.sh
+++ b/host/fs-root/bin/docker_sshd.sh
@@ -1,11 +1,12 @@
 #! /bin/bash
 
+source /sf/bin/funcs_redis.sh
+
 # CY="\e[1;33m" # yellow
 CR="\e[1;31m" # red
 # CC="\e[1;36m" # cyan
 CN="\e[0m"    # none
 
-
 SLEEPEXIT()
 {
 	local s
@@ -64,6 +65,8 @@ LG_PID_DIR="${SF_RUN_DIR}/pids"
 [[ -d "${LG_PID_DIR}" ]] && rm -rf "${LG_PID_DIR}"
 mkdir -p "${LG_PID_DIR}"
 chown 1000 "${LG_PID_DIR}" || SLEEPEXIT 255 5 "${CR}Not found: ${LG_PID_DIR}${CN}"
+[[ -d "${SF_RUN_DIR}/logs" ]] && chown 1000 "${SF_RUN_DIR}/logs"
+chmod 777 "/sf/run/redis/sock/redis.sock"
 
 # Wait for systemwide encryption to be available.
 # Note: Do not need to wait for /everyone because no other service
@@ -105,6 +108,13 @@ chmod 644 "${SF_CFG_HOST_DIR}/etc/ssh/id_ed25519"
 cp "${SF_CFG_HOST_DIR}/etc/ssh/id_ed25519" "${SF_CFG_GUEST_DIR}/id_ed25519"
 # [[ ! -f "${SF_CFG_GUEST_DIR}/id_ed25519" ]] && cp "${SF_CFG_HOST_DIR}/etc/ssh/id_ed25519" "${SF_CFG_GUEST_DIR}/id_ed25519"
 
+# Create semaphore (buckets)
+i=0
+while [[ $i -lt $SF_HM_SIZE_LG ]]; do
+	echo -e "DEL 'sema:lg-$i'\nRPUSH 'sema:lg-$i' 1" | red
+	((i++))
+done
+
 # SSHD resets the environment variables. The environment variables relevant to the guest
 # are stored in a file here and then read by `segfaultsh'.
 # Edit 'segfaultsh' and add them to 'docker run --env' to pass any of these
@@ -115,12 +125,14 @@ SF_DNS=\"${SF_DNS}\"
 SF_TOR_IP=\"${SF_TOR_IP}\"
 SF_SEED=\"${SF_SEED}\"
 SF_REDIS_AUTH=\"${SF_REDIS_AUTH}\"
-SF_REDIS_IP=\"${SF_REDIS_IP}\"
 SF_RPC_IP=\"${SF_RPC_IP}\"
 SF_USER=\"${SF_USER}\"
 SF_DEBUG=\"${SF_DEBUG}\"
 SF_BASEDIR=\"${SF_BASEDIR}\"
 SF_SHMDIR=\"${SF_SHMDIR}\"
+SF_RAND_OFS=\"$RANDOM\"
+SF_HM_SIZE_LG=\"$SF_HM_SIZE_LG\"
+SF_NS_NET=\"$(readlink /proc/self/ns/net)\"
 SF_FQDN=\"${SF_FQDN}\"" >/dev/shm/env.txt
 
 # Note: Any host added here also needs to be added in segfaultsh with --add-host
diff --git a/host/fs-root/bin/segfaultsh b/host/fs-root/bin/segfaultsh
index 8296b4b..15bbcd7 100755
--- a/host/fs-root/bin/segfaultsh
+++ b/host/fs-root/bin/segfaultsh
@@ -3,6 +3,9 @@
 # This is called by SSHD inside SF-HOST docker.
 # - All environments have been cleared by SSHD.
 # - Redirects not allowed in restricted shells.
+# - bash's 'source' is prohibited (use 'eval' instead)
+# - This script might be executed inside the LG's network namespace
+#   (if 'ssh -M -S ~/.ssh/foobar' and 'ssh -S ~/.ssh/foobar' is used for multiplexing/Mastering)
 #
 # This script can be run from the source directory for testing.
 # SF_BASEDIR must point to the source directory.
@@ -10,10 +13,8 @@
 #    export SF_BASEDIR=/home/sf-user/x/segfault-0.2.2a
 #    cd /segfault/host/fs-root/bin
 #    SF_DEBUG=1 SF_EMU=1 SF_SEED=foobar3 ./segfaultsh
-#
+
 # Load/restore environment variables from file
-# `source' is prohibited from outside directory in restricted bash shell (bash -r)
-# use `eval' trick to load environemnt variables into a restricted shell
 # SF_DEBUG can be set by ssh-client with -o SetEnv SF_DEBUG=1 or by
 # docker compose '.env' file.
 SSH_SF_DEBUG="${SF_DEBUG}" # Set by SSH client
@@ -21,7 +22,7 @@ SSH_SF_DEBUG="${SF_DEBUG}" # Set by SSH client
 [[ -z $SF_DEBUG ]] && SF_DEBUG="${SSH_SF_DEBUG}"
 unset SSH_SF_DEBUG
 eval "$(</sf/bin/funcs_redis.sh)"
-# Debug Trace
+# Debug Trace. see sf_trace-DISABLED
 [[ -f /bin/sf_trace ]] && eval "$(</bin/sf_trace)"
 
 CY="\e[1;33m" # yellow
@@ -51,12 +52,58 @@ _log()
 	# Replace ' with '"'"'
 	str="${*//\'/\'\"\'\"\'}"
 	# NOTE: segfault.log must be owned 1000:1000
-	bash -c "{ echo -en '[$(date '+%F %T' -u)]${p:- }'; echo -e '[${LID}] $str';} 2>/dev/null >>'/sf/run/logs/segfault.log'"
+	bash -c "{ echo -en '[$(date '+%F %T' -u)]${p:- }'; echo -e '[${LID}][$$] $str';} 2>/dev/null >>'/sf/run/logs/segfault.log'"
 }
 
 LOG(){ _log "" "$@"; }
-LOG_E() { _log "${CR}ERROR${CN}" "$@";}
-LOG_W() { _log "${CDY}WARN${CN}" "$@";}
+LOG_E() { _log " ${CR}ERROR${CN} " "$@";}
+LOG_W() { _log " ${CDY}WARN${CN} " "$@";}
+
+# NOTE: This function might get called from ERREXIT and before all variables are set.
+logout()
+{
+	local fn
+	local pid
+	local is_last
+	# bash signal race condition: Might be called twice if signal arrives while
+	# in this function.
+	trap '' SIGHUP
+	trap '' SIGTERM
+	touch "${TS_LOGOUT_FILE:?}"
+	[[ -f "${LG_PID_FILE:?}" ]] && rm -f "${LG_PID_FILE}"
+	# Delete IS_LOGGED_IN_FILE if this is the last session to exit.
+	is_last=1
+	for fn in "${LG_PID_DIR:?}/pid-${LID:?}."*; do
+		[[ ! -f "$fn" ]] && break # No pid file exists for this LID
+		pid=${fn##*.}
+		[[ ! -d "/proc/${pid}" ]] && {
+			# FIXME: This should never happen...but it does
+			# (e.g. when 'Failed to set up guest instance' is triggered)
+			LOG_E "Stale: pid-${LID}.${pid} [removed]"
+			rm -f "${fn}" 
+			continue
+		}
+		unset is_last
+	done
+
+	[[ -n $is_last ]] && {
+		LOG "Last PID"
+		[[ -f "${IS_LOGGED_IN_FILE:?}" ]] && rm -f "${IS_LOGGED_IN_FILE}"
+	}
+}
+
+sem_wait()
+{
+	redq BLPOP "${LG_SEM:?}" 15 || ERREXIT 238 "Could not get lock: ${LG_SEM}"
+	IS_SEM_WAIT=1
+}
+
+sem_release()
+{
+	[[ -z $IS_SEM_WAIT ]] && return
+	unset IS_SEM_WAIT
+	echo -e "DEL '${LG_SEM}'\nRPUSH '${LG_SEM}' 1" | red1 || ERREXIT 237 "Could not release lock: ${LG_SEM}"
+}
 
 ERREXIT()
 {
@@ -68,9 +115,12 @@ ERREXIT()
 	shift 1
 	[[ -n $1 ]] && echo -e >&2 "${CR}ERROR:${CN} $*"
 
+	logout
+	sem_release
 	exit "$code"
 }
 
+
 if [[ -z $SF_DEBUG ]]; then
 	DEBUGF(){ :;}
 	SF_DOCKER_LOG="none"
@@ -230,23 +280,6 @@ init_defaults()
 	SF_ENCFS_SEC_DIR="${SF_SHMDIR}/encfs-sec"
 }
 
-logout()
-{
-	# bash signal race condition: Might be called twice if signal arrives while
-	# in this function.
-	trap '' SIGHUP
-	trap '' SIGTERM
-	touch "${TS_LOGOUT_FILE:?}"
-	rm -f "${LG_PID_FILE:?}"
-	# Delete IS_LOGGED_IN_FILE if this is the last session to exit.
-	for fn in "${LG_PID_DIR}/pid-${LID}."*; do
-		[[ -f "$fn" ]] && break
-		# HERE: Last pid file for this lid.
-		LOG "Last PID"
-		rm -f "${IS_LOGGED_IN_FILE:?}"
-		break
-	done
-}
 
 # shellcheck disable=SC2317 # Not reachable
 cb_sighup()
@@ -304,6 +337,10 @@ init_vars()
 		CPUS=4
 	fi
 
+	# Check if we are still in sshd's Network Namespace
+	IS_SSHD_NS_NET=1
+	[[ ${SF_NS_NET:?} != "$(readlink /proc/self/ns/net)" ]] && unset IS_SSHD_NS_NET # Already inside LG's Network Namespace
+
 	trap cb_sighup SIGHUP
 	trap cb_sigterm SIGTERM
 }
@@ -417,39 +454,22 @@ echo_pty()
 }
 
 
-wait_file_exist()
-{
-	local fn
-	local max_sec
-	local n
-	max_sec="$1"
-	fn="$2"
-
-	n=0
-	while [[ $n -lt $max_sec ]]; do
-		[[ -f "$fn" ]] && return 0 # True
-		((n++))
-		sleep 1
-	done
-
-	return 255
-}
-
-
 sshd_to_ns()
 {
-	local upid
+	# local upid
 	local str
 
-	# Find PID of sleep process (uid=1000)
-	str=$(docker top "lg-${LID}" -o uid,pid | grep ^"1000 ")
-	upid="${str##* }"
-	[[ -z $upid ]] && ERREXIT 222 "Oops. Cant find pid of sleep process."
-	ln -s "/proc/${upid}/ns/net" "/dev/shm/ns-net-${PPID}"
-	DEBUGF "Moving SSHD(=$PPID) to net-NS(=$upid)"
-	kill -USR1 $PPID || ERREXIT 221 "Oops. Could not signal SSHD ($PPID)."
-}
+	[[ -z $IS_SSHD_NS_NET ]] && return  # Already in LG's network namespace?
 
+	# Load PID of container's init process (uid=1000)
+	[[ -z $LG_PID ]] && {
+		LG_PID=$(<"/sf/run/pids/lg-${LID}.pid")
+		[[ -z $LG_PID ]] && ERREXIT 222 "Init PID not found."
+	}
+	ln -sf "/proc/${LG_PID}/ns/net" "/dev/shm/ns-net-${PPID}"
+	DEBUGF "Moving SSHD(=$PPID) to net-NS(=$LG_PID)"
+	kill -USR1 "$PPID" || ERREXIT 221 "Oops. Could not signal SSHD ($PPID)."
+}
 
 spawn_shell_exit()
 {
@@ -459,10 +479,7 @@ spawn_shell_exit()
 	# Move SSHD to guest's network namespace (for -L/-R to work)
 	sshd_to_ns
 
-	wait_file_exist 20 "${LG_SEMA_INIT_DONE_FN}" || {
-		exec_devnull docker stop "lg-${LID}"
-		ERREXIT 237 "Oops. Found a stale lock file."
-	}
+	sem_release
 
 	# Update current IP:
 	tofile "${YOUR_IP:?}" "/config/self-for-guest/lg-${LID}/ip"
@@ -618,7 +635,7 @@ check_banned()
 		echo -e "${CR}@@@@@ YOUR IP (${YOUR_IP}) HAS BEEN BANNED. Contact us if you feel that this is wrong. @@@@@${CN}"
 	fi
 	sleep 30
-	exit 0
+	exit 255
 }
 
 # wait_for_conn_limit <ID> <ts_window>
@@ -856,7 +873,7 @@ check_banned
 
 mk_hostname
 HNLID_FILE="${HNLID_DIR}/hn2lid-${SF_HOSTNAME}"
-LG_SEMA_INIT_DONE_FN="${SF_USER_DB_DIR}/init-done"
+LG_SEM="sema:lg-$(( (SF_NUM + SF_RAND_OFS) % SF_HM_SIZE_LG ))"
 
 # Keep guest waiting until there are sufficient resources
 wait_for_resources
@@ -933,6 +950,9 @@ res=$(echo -e "RPUSH encfs \"$$ ${LID} M ${encfspass}\"\n\
 BLPOP \"encfs-$$-${LID}-M\" 20" | red) || ERREXIT 230 "Can't reach EncFSD"
 echo_pty -n "...."
 
+# Only one LG at a time (and wait any other connection to call 'docker exec' until it's fully running.
+sem_wait
+
 # Attach to container if already running
 [[ -n $IS_TRY_EXISTING ]] && {
 	# If state is not running then stop it.
@@ -967,10 +987,6 @@ echo_pty -n "...."
 selfdir="/config/self-for-guest/lg-${LID}"
 xmkdir "${selfdir}"
 
-# Give docker-run and following command 5 seconds to complete
-# before allowing any docker-exec to spawn user shell.
-[[ -f "${LG_SEMA_INIT_DONE_FN}" ]] && rm -f "${LG_SEMA_INIT_DONE_FN:?}"
-
 # Note: cgroup-parents: with cgroup-v1 the full path needs to be specified (e.g. sf.slice/sf-guest.slice) whereas with
 # cgroup-v2 only sf-guest.slice need to be specified.
 exec_devnull docker run \
@@ -1009,8 +1025,8 @@ exec_devnull docker run \
 	-v "${SF_ENCFS_SEC_DIR}/www-root/www/${SF_HOSTNAME,,}:/onion:slave" \
 	--user 1000:1000 \
 	-d \
-	"sf-guest${SF_GUEST_CONTAINER_NAME_SUFFIX}" bash -c "exec -a '[init-${LID}-${SF_HOSTNAME}]' sleep infinity" || ERREXIT 251 "Failed to set up guest container..."
-# Note: Run 'sleep' as user 1000:1000 so that sf-host's SSHD can move itself into this guest's
+	"sf-guest${SF_GUEST_CONTAINER_NAME_SUFFIX}" bash -c "exec -a '[init-${LID}-${SF_HOSTNAME}]' sleep infinity" || ERREXIT 251 "Failed-#1 to set up guest container..."
+# Note: Run 'init/sleep' as user 1000:1000 so that sf-host's SSHD can move itself into this guest's
 # network namespace. 
 
 echo_pty -n ".."
@@ -1041,6 +1057,7 @@ CID=${arr[0]}
 LG_PID=${arr[1]}
 C_IP=${arr[2]}
 [[ -z $C_IP ]] && ERREXIT 249 "Could not get container's IP address."
+tofile "${LG_PID:?}" "/sf/run/pids/lg-${LID}.pid"
 
 # Set up Root FS / inode limits and move encfsd to lg's cgroup
 setup_encfsd || ERREXIT 244 "Could not set FS quota."
@@ -1057,15 +1074,12 @@ res=$(red SET "ip:${C_IP}" "${LID} ${CID} ${LG_PID}") || ERREXIT 252 "Failed to
 exec_devnull docker exec sf-master bash -c "nsenter.u1000 -t \"${LG_PID}\" -n iptables -t nat -A OUTPUT -p tcp --dst 255.0.0.1 -j DNAT --to-destination 127.0.0.1"
 
 # Setup container
-exec_devnull docker exec --user 0:0 "lg-${LID}" /sf/bin/sf-setup.sh || ERREXIT 252 "Failed to set up guest container..."
+exec_devnull docker exec --user 0:0 "lg-${LID}" /sf/bin/sf-setup.sh || ERREXIT 252 "Failed-#2 to set up guest container..."
 touch "/config/self-for-guest/lg-${LID}/THIS-DIRECTORY-IS-IN-MEMORY-ONLY"
 tofile "${C_IP:?}" "/config/self-for-guest/lg-${LID}/c_ip"
 
 echo_pty -e "....[${CG}OK${CN}]"
 
-# Mark as init-complete:
-touch "${LG_SEMA_INIT_DONE_FN}"
-
 # Show help how to connect elegantly
 [[ -n $IS_NEW_SERVER ]] && print_ssh_access
 
diff --git a/host/fs-root/etc/ssh/sshd_config b/host/fs-root/etc/ssh/sshd_config
old mode 100644
new mode 100755
diff --git a/sfbin/funcs_redis.sh b/sfbin/funcs_redis.sh
index 23e81ff..377326b 100644
--- a/sfbin/funcs_redis.sh
+++ b/sfbin/funcs_redis.sh
@@ -1,29 +1,48 @@
 
 # BUG-ARP-CACHE, _must_ use IP address
-[[ -z $SF_REDIS_IP ]] && { echo >&2 "SF_REDIS_IP= not set"; return 255; }
+# [[ -z $SF_REDIS_IP ]] && { echo >&2 "SF_REDIS_IP= not set"; return 255; }
 # SF_REDIS_SERVER="${SF_REDIS_SERVER:-sf-redis}"
-REDCMD=("redis-cli" "--raw" "-h" "${SF_REDIS_IP}")
+# REDCMD=("redis-cli" "--raw" "-h" "${SF_REDIS_IP}")
+REDCMD=("redis-cli" "--raw" "-s" "/redis-sock/redis.sock")
 export REDISCLI_AUTH="${SF_REDIS_AUTH}"
 
 # Redis Retrieve
 redr()
 {
 	local res
-	bash -c "{ echo '[###] [$(date '+%F %T' -u)] #######################'; ip l sh dev eth1; ip a s dev eth1; arp -n; }  2>>'/dev/shm/lg-${LID}.err'  >>'/dev/shm/lg-${LID}.log'"
+	
 	res=$("${REDCMD[@]}" "$@") || return 255
 	[[ -z $res ]] && return 200
 	echo "$res"
 	return 0
 }
 
-# Redis Set
+# Quiete retrieve
+redq()
+{
+	local res
+	res=$("${REDCMD[@]}" "$@") || return 255
+	[[ -z $res ]] && return 200
+	return 0
+}
+
+# Redis Set, Last line is "OK" on success.
 red()
 {
 	local res
 
 	res=$("${REDCMD[@]}" "$@") || return 255
 	[[ -z $res || "${res##*$'\n'}" != "OK" ]] && return 200
-	# echo "$res"
+	return 0
+}
+
+# Redis Set, last line is "1" on success.
+red1()
+{
+	local res
+
+	res=$("${REDCMD[@]}" "$@") || return 255
+	[[ -z $res || "${res##*$'\n'}" != "1" ]] && return 200
 	return 0
 }
 
diff --git a/sfbin/sf b/sfbin/sf
index 956bd05..b75ba47 100755
--- a/sfbin/sf
+++ b/sfbin/sf
@@ -217,6 +217,10 @@ WARN_ENTER
 
 # Delete stale run files..
 [[ -d "${SF_SHMDIR}/run/encfsd/user" ]] && rm -rf "${SF_SHMDIR}/run/encfsd/user"
+[[ ! -d "${SF_SHMDIR}/run/redis/sock" ]] && mkdir -p "${SF_SHMDIR}/run/redis/sock"
+chmod 700 "${SF_SHMDIR}/run/redis"
+chown 999 "${SF_SHMDIR}/run/redis/sock" # docker/redis user
+chmod 711 "${SF_SHMDIR}/run/redis/sock"
 # exec docker-compose "$@"
 docker-compose "$@"
 ret=$?