diff --git a/CHANGELOG.md b/CHANGELOG.md
index face090..b5cb675 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ All notable changes to the Zlux App Server package will be documented in this fi
     
 ## v2.12.0
 - enhancement: new versions of components can change the location of their plugins, as the app-server will now re-inspect the plugin locations on each startup. (#280)
+- bugfix: Removed error message "components/app-server/bin/configure.sh 26: .: FSUM6807 expression syntax error" seen in startup of Zowe in v2.11.0, caused by incorrect shell syntax. (#283)
 
 
 ## v2.11.0
diff --git a/bin/configure.sh b/bin/configure.sh
index ec64045..36276d8 100755
--- a/bin/configure.sh
+++ b/bin/configure.sh
@@ -23,30 +23,28 @@ fi
 
 cd ${COMPONENT_HOME}/share/zlux-app-server/bin
 
-if [ -n "$ZWE_components_app_server_node_mediationLayer_enabled" -a -z "$ZWE_components_app_server_agent_mediationLayer_enabled" ]; then
-  if [ "${ZWE_RUN_ON_ZOS}" != "true" ]; then
-    zss_def_template="zss.apiml_static_reg.yaml.template"
-    zss_configured=false
-    if [ -n "${ZWE_components_app_server_agent_https_port}" ]; then
-      export ZSS_PORT="${ZWE_components_app_server_agent_https_port}"
-      export ZSS_PROTOCOL=https
-      zss_configured=true
-    elif [ -n "${ZWED_components_app_server_agent_http_port}" ]; then 
-      export ZSS_PORT="${ZWE_components_app_server_http_port}"
-      export ZSS_PROTOCOL=http
-      zss_configured=true
-    fi
-
-    if [ "${zss_configured}" = "true" ] && [ -n "${ZWE_STATIC_DEFINITIONS_DIR}" ]; then
-      zss_registration_yaml=${ZWE_STATIC_DEFINITIONS_DIR}/zss.apiml_static_reg_yaml_template.${ZWE_CLI_PARAMETER_HA_INSTANCE}.yml
-      zss_def="../${zss_def_template}"
-      zss_parsed_def=$( ( echo "cat <<EOF" ; cat "${zss_def}" ; echo ; echo EOF ) | sh 2>&1)
-      echo "${zss_parsed_def}" > "${zss_registration_yaml}"
-      chmod 770 "${zss_registration_yaml}"
-    fi
+if [ "$ZWE_components_gateway_enabled" = "true" ]; then
+  if [ "$ZWE_components_zss_enabled" = "true" ]; then
+    if [ "${ZWE_RUN_ON_ZOS}" != "true" ]; then
+      zss_def_template="zss.apiml_static_reg.yaml.template"
+      export ZSS_PORT="${ZWE_components_zss_port}"
+      if [ "${ZWE_components_zss_tls}" != "false" ]; then
+        export ZSS_PROTOCOL=https
+      else
+        export ZSS_PROTOCOL=http
+      fi
   
-    unset ZSS_PORT
-    unset ZSS_PROTOCOL
+      if [ -n "${ZWE_STATIC_DEFINITIONS_DIR}" ]; then
+        zss_registration_yaml=${ZWE_STATIC_DEFINITIONS_DIR}/zss.apiml_static_reg_yaml_template.${ZWE_CLI_PARAMETER_HA_INSTANCE}.yml
+        zss_def="../${zss_def_template}"
+        zss_parsed_def=$( ( echo "cat <<EOF" ; cat "${zss_def}" ; echo ; echo EOF ) | sh 2>&1)
+        echo "${zss_parsed_def}" > "${zss_registration_yaml}"
+        chmod 770 "${zss_registration_yaml}"
+      fi
+    
+      unset ZSS_PORT
+      unset ZSS_PROTOCOL
+    fi
   fi
 fi
 
diff --git a/defaults/serverConfig/defaults.yaml b/defaults/serverConfig/defaults.yaml
index 38fc57e..c2daa70 100644
--- a/defaults/serverConfig/defaults.yaml
+++ b/defaults/serverConfig/defaults.yaml
@@ -61,11 +61,10 @@ components:
       loopbackAddress: "${{ function a(){ if (process.env.ZOWE_LOOPBACK_ADDRESS) { return process.env.ZOWE_LOOPBACK_ADDRESS; } else { return undefined; } }; a() }}"
       mediationLayer:
         server:
-          # if ZWE_DISCOVERY_SERVICES_LIST exists, its more accurate than zowe.externalDomains, as that doesn't handle containers well.
-          # if exists, its in the format of "https://discovery-0.discovery-service.zowe.svc.cluster.local:7553/eureka/"
+          # strange but true: to contact discovery in a container, instead reach for the gateway hostname.
           hostname: '${{ function a() {
-                         if (process.env.ZWE_DISCOVERY_SERVICES_LIST) {
-                           return process.env.ZWE_DISCOVERY_SERVICES_LIST.split(",")[0].split("/")[2].split(":")[0];
+                         if (process.env.ZWE_RUN_IN_CONTAINER=="true" && process.env.ZWE_GATEWAY_HOST) {
+                           return process.env.ZWE_GATEWAY_HOST;
                          } else { 
                            return zowe.externalDomains[0] } };
                      a() }}'
@@ -78,7 +77,13 @@ components:
                                   return zowe.externalDomains[0] } };
                             a() }}'
           port: ${{ components.discovery.port }}
-          gatewayPort: ${{ zowe.externalPort }}
+          # strange but true: to contact gateway in a container, dont use the external port.
+          gatewayPort: '${{ function a() {
+                         if (process.env.ZWE_RUN_IN_CONTAINER=="true") {
+                           return components.gateway.port;
+                         } else { 
+                           return zowe.externalPort } };
+                     a() }}'
           isHttps: true
           cachingService:
             enabled: ${{ components['app-server'].node.mediationLayer.enabled && components['caching-service'].enabled }}