diff --git a/deploy/README.md b/deploy/README.md
index 4c09e46..f29eb07 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -46,6 +46,10 @@ cd "$REPO_ROOT"
 ./deploy/scripts/deploy_client.sh "$REPO_ROOT" "$PUBLISH_DIR" "$BASE_PATH"
 ```
 
+Optional 4th arg:
+- server config path used when generating `media_proxy.config.php`
+- use this for secondary grids that do not use `server/config.toml`
+
 ## 4) Install/Reload Service Unit
 
 ```bash
@@ -67,6 +71,9 @@ cd "$REPO_ROOT"
 ./deploy/scripts/up.sh "$REPO_ROOT" "$PUBLISH_DIR" "$BASE_PATH" "$UNIT_NAME"
 ```
 
+Optional 5th arg:
+- server config path used when generating the media proxy session-check URL
+
 ## 6) Apache Websocket Proxy
 
 Install your vhost include from the provided snippet:
@@ -108,7 +115,7 @@ ProxyPassReverse /listen/8000/  http://127.0.0.1:8000/
 
 `deploy/php/media_proxy.php` is copied into your publish directory by `deploy_client.sh`.
 
-When `server/.env` contains `CHGRID_HOST_ORIGIN`, `deploy_client.sh` also generates `media_proxy.config.php` in the publish directory so the proxy can enforce the same origin and validate authenticated sessions without extra Apache-specific config. The generated file derives the local auth-check URL from `server/config.toml`, so custom signaling ports continue to work, and the proxy reuses `CHGRID_HOST_ORIGIN` for its internal auth check.
+When `server/.env` contains `CHGRID_HOST_ORIGIN`, `deploy_client.sh` also generates `media_proxy.config.php` in the publish directory so the proxy can enforce the same origin and validate authenticated sessions without extra Apache-specific config. The generated file derives the local auth-check URL from the selected server config file (default `server/config.toml`), so custom signaling ports and secondary grid configs continue to work, and the proxy reuses `CHGRID_HOST_ORIGIN` for its internal auth check.
 
 If you deploy the PHP proxy some other way, you can still provide `CHGRID_HOST_ORIGIN` directly through your PHP/web-server environment.
 
diff --git a/deploy/scripts/deploy_client.sh b/deploy/scripts/deploy_client.sh
index b8cc316..55f1079 100755
--- a/deploy/scripts/deploy_client.sh
+++ b/deploy/scripts/deploy_client.sh
@@ -5,6 +5,7 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 REPO_ROOT="${1:-$(cd "$SCRIPT_DIR/../.." && pwd)}"
 PUBLISH_DIR="${2:-$REPO_ROOT/deploy/publish/chgrid}"
 BASE_PATH="${3:-/chgrid/}"
+SERVER_CONFIG_PATH="${4:-$REPO_ROOT/server/config.toml}"
 CLIENT_DIR="$REPO_ROOT/client"
 PHP_PROXY_DIR="$REPO_ROOT/deploy/php"
 SERVER_ENV_FILE="$REPO_ROOT/server/.env"
@@ -45,7 +46,7 @@ if [[ -n "${CHGRID_HOST_ORIGIN:-}" ]]; then
     config_python="$SERVER_VENV_PYTHON"
   fi
   session_check_url="$(
-    "$config_python" - "$REPO_ROOT/server/config.toml" <<'PY'
+    "$config_python" - "$SERVER_CONFIG_PATH" <<'PY'
 from pathlib import Path
 import sys
 
@@ -105,3 +106,4 @@ find "$PUBLISH_DIR" -type f -exec chmod 644 {} +
 
 echo "client deploy complete: $PUBLISH_DIR"
 echo "client base path: $BASE_PATH"
+echo "server config path: $SERVER_CONFIG_PATH"
diff --git a/deploy/scripts/up.sh b/deploy/scripts/up.sh
index 84fd564..d666285 100755
--- a/deploy/scripts/up.sh
+++ b/deploy/scripts/up.sh
@@ -6,7 +6,8 @@ REPO_ROOT="${1:-$(cd "$SCRIPT_DIR/../.." && pwd)}"
 PUBLISH_DIR="${2:-$REPO_ROOT/deploy/publish/chgrid}"
 BASE_PATH="${3:-/chgrid/}"
 SERVICE_NAME="${4:-chat-grid.service}"
+SERVER_CONFIG_PATH="${5:-$REPO_ROOT/server/config.toml}"
 
-"$REPO_ROOT/deploy/scripts/deploy_client.sh" "$REPO_ROOT" "$PUBLISH_DIR" "$BASE_PATH"
+"$REPO_ROOT/deploy/scripts/deploy_client.sh" "$REPO_ROOT" "$PUBLISH_DIR" "$BASE_PATH" "$SERVER_CONFIG_PATH"
 sudo systemctl restart "$SERVICE_NAME"
 sudo systemctl status "$SERVICE_NAME" --no-pager