Hi everyone!
Why can the connection to an MCP serv...
# questionsp
plain-orange-3218
11/24/2025, 7:10 PMHi everyone!
Why can the connection to an MCP server over SSE be lost? Both OpenHands and the MCP server are on the same host. Through MCP Inspector the server responds correctly, but when starting a new conversation (not always, but often — I still haven’t identified the pattern) the Docker log shows an error (into the thread)
Copy code
File "/app/.venv/lib/python3.13/site-packages/mcp/shared/session.py", line 285, in send_request
raise McpError(
...<8 lines>...
)
mcp.shared.exceptions.McpError: Timed out while waiting for response to ClientRequest. Waited 30.0 seconds.
10:39:36 - openhands:INFO: utils.py:127 - Initializing MCP agent for url='<http://fct01-slt-msk1.yclients.cloud:8100/sse>' api_key='******' with SSE connection...
10:39:37 - openhands:INFO: client.py:57 - Connected to server with tools: ['gitlab_mr_diff']plain-orange-3218
11/24/2025, 7:10 PM Copy code
[Agent Controller 2ab04e5654b34965ba3dacf6666a750b] **MCPAction**
NAME: ai_review
ARGUMENTS: {'repo_slug': 'yclients/biz.erp', 'project_id': '12', 'mr_iid': '26954', 'conversation_id': 'conv1'}
10:39:06 - openhands:INFO: utils.py:127 - Initializing MCP agent for url='<http://fct01-slt-msk1.yclients.cloud:8000/sse>' api_key='******' with SSE connection...
10:39:36 - openhands:ERROR: client.py:103 - McpError connecting to <http://fct01-slt-msk1.yclients.cloud:8000/sse>: Timed out while waiting for response to ClientRequest. Waited 30.0 seconds.
10:39:36 - openhands:ERROR: utils.py:152 - Failed to connect to url='<http://fct01-slt-msk1.yclients.cloud:8000/sse>' api_key='******': Timed out while waiting for response to ClientRequest. Waited 30.0 seconds.
Traceback (most recent call last):
File "/app/openhands/mcp/utils.py", line 138, in create_mcp_clients
await client.connect_http(server, conversation_id=conversation_id)
File "/app/openhands/mcp/client.py", line 100, in connect_http
await self._initialize_and_list_tools()
File "/app/openhands/mcp/client.py", line 40, in _initialize_and_list_tools
async with self.client:
^^^^^^^^^^^
File "/app/.venv/lib/python3.13/site-packages/fastmcp/client/client.py", line 260, in __aexit__
await self._disconnect()
File "/app/.venv/lib/python3.13/site-packages/fastmcp/client/client.py", line 298, in _disconnect
await runner_task
File "/app/.venv/lib/python3.13/site-packages/fastmcp/client/client.py", line 309, in _session_runner
await stack.enter_async_context(self._context_manager())
File "/usr/local/lib/python3.13/contextlib.py", line 668, in enter_async_context
result = await _enter(cm)
^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.13/contextlib.py", line 214, in __aenter__
return await anext(self.gen)
^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.13/site-packages/fastmcp/client/client.py", line 237, in _context_manager
with catch(get_catch_handlers()):
~~~~~^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.13/site-packages/exceptiongroup/_catch.py", line 39, in __exit__
raise unhandled from exc.__cause__
File "/app/.venv/lib/python3.13/site-packages/exceptiongroup/_catch.py", line 65, in handle_exception
result = handler(matched)
File "/app/.venv/lib/python3.13/site-packages/fastmcp/utilities/exceptions.py", line 29, in _exception_handler
raise leaf
File "/app/.venv/lib/python3.13/site-packages/fastmcp/client/transports.py", line 216, in connect_session
yield session
File "/app/.venv/lib/python3.13/site-packages/fastmcp/client/client.py", line 245, in _context_manager
self._initialize_result = await self._session.initialize()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.13/site-packages/mcp/client/session.py", line 133, in initialize
result = await self.send_request(
^^^^^^^^^^^^^^^^^^^^^^^^
...<15 lines>...
)
^
File "/app/.venv/lib/python3.13/site-packages/mcp/shared/session.py", line 285, in send_request
raise McpError(
...<8 lines>...
)
mcp.shared.exceptions.McpError: Timed out while waiting for response to ClientRequest. Waited 30.0 seconds.
10:39:36 - openhands:INFO: utils.py:127 - Initializing MCP agent for url='<http://fct01-slt-msk1.yclients.cloud:8100/sse>' api_key='******' with SSE connection...
10:39:37 - openhands:INFO: client.py:57 - Connected to server with tools: ['gitlab_mr_diff']l
limited-student-10747
11/28/2025, 1:35 PMHey @plain-orange-3218, unfortunately I don’t know the answer for this, but if you can open a github issue about it we can track it and see if anyone else notices too
🙌 1
p
plain-orange-3218
11/28/2025, 4:00 PMThanks for the response! I’m still keeping an eye on this issue and noticed that it doesn’t occur when running locally on a different port. I’ll continue monitoring it further.
👍 1