diff --git a/openhands/runtime/action_execution_server.py b/openhands/runtime/action_execution_server.py
index fe9ca8897e..727f49fbe5 100644
--- a/openhands/runtime/action_execution_server.py
+++ b/openhands/runtime/action_execution_server.py
@@ -21,7 +21,7 @@ from zipfile import ZipFile
 from binaryornot.check import is_binary
 from fastapi import Depends, FastAPI, HTTPException, Request, UploadFile
 from fastapi.exceptions import RequestValidationError
-from fastapi.responses import FileResponse, HTMLResponse, JSONResponse
+from fastapi.responses import FileResponse, JSONResponse
 from fastapi.security import APIKeyHeader
 from openhands_aci.editor.editor import OHEditor
 from openhands_aci.editor.exceptions import ToolError
@@ -57,10 +57,11 @@ from openhands.events.observation import (
 from openhands.events.serialization import event_from_dict, event_to_dict
 from openhands.runtime.browser import browse
 from openhands.runtime.browser.browser_env import BrowserEnv
+from openhands.runtime.file_viewer_server import start_file_viewer_server
 from openhands.runtime.plugins import ALL_PLUGINS, JupyterPlugin, Plugin, VSCodePlugin
+from openhands.runtime.utils import find_available_tcp_port
 from openhands.runtime.utils.async_bash import AsyncBashSession
 from openhands.runtime.utils.bash import BashSession
-from openhands.runtime.utils.file_viewer import generate_file_viewer_html
 from openhands.runtime.utils.files import insert_lines, read_lines
 from openhands.runtime.utils.memory_monitor import MemoryMonitor
 from openhands.runtime.utils.runtime_init import init_user_and_working_directory
@@ -532,6 +533,7 @@ class ActionExecutor:
 
 if __name__ == '__main__':
     logger.warning('Starting Action Execution Server')
+
     parser = argparse.ArgumentParser()
     parser.add_argument('port', type=int, help='Port to listen on')
     parser.add_argument('--working-dir', type=str, help='Working directory')
@@ -550,10 +552,13 @@ if __name__ == '__main__':
     # example: python client.py 8000 --working-dir /workspace --plugins JupyterRequirement
     args = parser.parse_args()
 
-    port_path = '/tmp/oh-server-url'
-    os.makedirs(os.path.dirname(port_path), exist_ok=True)
-    with open(port_path, 'w') as f:
-        f.write(f'http://127.0.0.1:{args.port}')
+    # Start the file viewer server in a separate thread
+    logger.info('Starting file viewer server')
+    _file_viewer_port = find_available_tcp_port(
+        min_port=args.port + 1, max_port=args.port + 10000
+    )
+    server_url, _ = start_file_viewer_server(port=_file_viewer_port)
+    logger.info(f'File viewer server started at {server_url}')
 
     plugins_to_load: list[Plugin] = []
     if args.plugins:
@@ -839,53 +844,5 @@ if __name__ == '__main__':
             logger.error(f'Error listing files: {e}')
             return []
 
-    @app.get('/view')
-    async def view_file(path: str, request: Request):
-        """View a file using an embedded viewer.
-
-        Args:
-            path (str): The absolute path of the file to view.
-            request (Request): The FastAPI request object.
-
-        Returns:
-            HTMLResponse: An HTML page with an appropriate viewer for the file.
-        """
-        # Security check: Only allow requests from localhost
-        client_host = request.client.host if request.client else None
-        if client_host not in ['127.0.0.1', 'localhost', '::1']:
-            logger.warning(f'Unauthorized file view attempt from {client_host}')
-            return HTMLResponse(
-                content='<h1>Access Denied</h1><p>This endpoint is only accessible from localhost</p>',
-                status_code=403,
-            )
-
-        if not os.path.isabs(path):
-            return HTMLResponse(
-                content=f'<h1>Error: Path must be absolute</h1><p>{path}</p>',
-                status_code=400,
-            )
-
-        if not os.path.exists(path):
-            return HTMLResponse(
-                content=f'<h1>Error: File not found</h1><p>{path}</p>', status_code=404
-            )
-
-        if os.path.isdir(path):
-            return HTMLResponse(
-                content=f'<h1>Error: Path is a directory</h1><p>{path}</p>',
-                status_code=400,
-            )
-
-        try:
-            html_content = generate_file_viewer_html(path)
-            return HTMLResponse(content=html_content)
-
-        except Exception as e:
-            logger.error(f'Error serving file viewer: {str(e)}')
-            return HTMLResponse(
-                content=f'<h1>Error viewing file</h1><p>{path}</p><p>{str(e)}</p>',
-                status_code=500,
-            )
-
     logger.debug(f'Starting action execution API on port {args.port}')
     run(app, host='0.0.0.0', port=args.port)
diff --git a/openhands/runtime/file_viewer_server.py b/openhands/runtime/file_viewer_server.py
new file mode 100644
index 0000000000..2e94a4ff2d
--- /dev/null
+++ b/openhands/runtime/file_viewer_server.py
@@ -0,0 +1,115 @@
+"""
+A tiny, isolated server that provides only the /view endpoint from the action execution server.
+This server has no authentication and only listens to localhost traffic.
+"""
+
+import os
+import threading
+from typing import Tuple
+
+from fastapi import FastAPI, Request
+from fastapi.responses import HTMLResponse
+from uvicorn import Config, Server
+
+from openhands.core.logger import openhands_logger as logger
+from openhands.runtime.utils.file_viewer import generate_file_viewer_html
+
+
+def create_app() -> FastAPI:
+    """Create the FastAPI application."""
+    app = FastAPI(
+        title='File Viewer Server', openapi_url=None, docs_url=None, redoc_url=None
+    )
+
+    @app.get('/')
+    async def root():
+        """Root endpoint to check if the server is running."""
+        return {'status': 'File viewer server is running'}
+
+    @app.get('/view')
+    async def view_file(path: str, request: Request):
+        """View a file using an embedded viewer.
+
+        Args:
+            path (str): The absolute path of the file to view.
+            request (Request): The FastAPI request object.
+
+        Returns:
+            HTMLResponse: An HTML page with an appropriate viewer for the file.
+        """
+        # Security check: Only allow requests from localhost
+        client_host = request.client.host if request.client else None
+        if client_host not in ['127.0.0.1', 'localhost', '::1']:
+            return HTMLResponse(
+                content='<h1>Access Denied</h1><p>This endpoint is only accessible from localhost</p>',
+                status_code=403,
+            )
+
+        if not os.path.isabs(path):
+            return HTMLResponse(
+                content=f'<h1>Error: Path must be absolute</h1><p>{path}</p>',
+                status_code=400,
+            )
+
+        if not os.path.exists(path):
+            return HTMLResponse(
+                content=f'<h1>Error: File not found</h1><p>{path}</p>', status_code=404
+            )
+
+        if os.path.isdir(path):
+            return HTMLResponse(
+                content=f'<h1>Error: Path is a directory</h1><p>{path}</p>',
+                status_code=400,
+            )
+
+        try:
+            html_content = generate_file_viewer_html(path)
+            return HTMLResponse(content=html_content)
+
+        except Exception as e:
+            return HTMLResponse(
+                content=f'<h1>Error viewing file</h1><p>{path}</p><p>{str(e)}</p>',
+                status_code=500,
+            )
+
+    return app
+
+
+def start_file_viewer_server(port: int) -> Tuple[str, threading.Thread]:
+    """Start the file viewer server on the specified port or find an available one.
+
+    Args:
+        port (int, optional): The port to bind to. If None, an available port will be found.
+
+    Returns:
+        Tuple[str, threading.Thread]: The server URL and the thread object.
+    """
+
+    # Save the server URL to a file
+    server_url = f'http://localhost:{port}'
+    port_path = '/tmp/oh-server-url'
+    os.makedirs(os.path.dirname(port_path), exist_ok=True)
+    with open(port_path, 'w') as f:
+        f.write(server_url)
+
+    logger.info(f'File viewer server URL saved to /tmp/oh-server-url: {server_url}')
+    logger.info(f'Starting file viewer server on port {port}')
+
+    app = create_app()
+    config = Config(app=app, host='127.0.0.1', port=port, log_level='error')
+    server = Server(config=config)
+
+    # Run the server in a new thread
+    thread = threading.Thread(target=server.run, daemon=True)
+    thread.start()
+
+    return server_url, thread
+
+
+if __name__ == '__main__':
+    url, thread = start_file_viewer_server(port=8000)
+    # Keep the main thread running
+    try:
+        thread.join()
+    except KeyboardInterrupt:
+        logger.info('Server stopped')