WSS handshake error

[nandhux91]

Hi. I am getting a WSServerHandshakeError: 401, message='Invalid response status when running my agents.py file in dev/start mode to connect with frontend app. It is clearly working in console mode.python agent.py dev

my .env:

LIVEKIT_URL=wss://friday-zagns3xh.livekit.cloud
LIVEKIT_API_KEY=
LIVEKIT_API_SECRET=

OPENAI_API_KEY=
ELEVEN_API_KEY=

error:

2025-09-19 00:01:30,321 - DEBUG asyncio - Using proactor: IocpProactor
2025-09-19 00:01:30,333 - DEV livekit.agents - Watching D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday
2025-09-19 00:01:32,842 - DEBUG asyncio - Using proactor: IocpProactor
2025-09-19 00:01:32,855 - INFO livekit.agents - starting worker {"version": "1.2.9", "rtc-version": "1.0.13"}
2025-09-19 00:01:32,855 - INFO livekit.agents - starting inference executor
2025-09-19 00:01:32,879 - INFO livekit.agents - initializing process {"pid": 53756, "inference": true}
2025-09-19 00:01:35,387 - DEBUG livekit.agents - initializing inference runner {"runner": "lk_end_of_utterance_multilingual", "pid": 53756, "inference": true}
None of PyTorch, TensorFlow >= 2.0, or Flax have been found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2025-09-19 00:01:40,690 - INFO livekit.agents - process initialized {"pid": 53756, "inference": true, "elapsed_time": 7.81}
2025-09-19 00:01:40,690 - DEBUG livekit.agents - inference runner initialized {"runner": "lk_end_of_utterance_multilingual", "elapsed_time": 5.303021100000478, "pid": 53756, "inference": true}
2025-09-19 00:01:40,690 - DEBUG asyncio - Using proactor: IocpProactor {"pid": 53756, "inference": true}
2025-09-19 00:01:41,081 - WARNING livekit.agents - failed to connect to livekit, retrying in 4s
Traceback (most recent call last):
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\worker.py", line 649, in _connection_task
ws = await self._http_session.ws_connect(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\aiohttp\client.py", line 1084, in _ws_connect
raise WSServerHandshakeError(
aiohttp.client_exceptions.WSServerHandshakeError: 401, message='Invalid response status', url='wss://friday-zagns3xh.livekit.cloud/agent'
2025-09-19 00:01:47,310 - WARNING livekit.agents - failed to connect to livekit, retrying in 6s

RuntimeError: failed to connect to livekit after 16 attempts
2025-09-19 00:03:52,383 - ERROR livekit.agents - worker failed
Traceback (most recent call last):
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\cli_run.py", line 79, in _worker_run
await worker.run()
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\worker.py", line 474, in run
await asyncio.gather(*tasks)
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\utils\log.py", line 16, in async_fn_logs
return await fn(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\worker.py", line 695, in _connection_task
raise RuntimeError(
RuntimeError: failed to connect to livekit after 16 attempts
2025-09-19 00:03:52,390 - INFO livekit.agents - shutting down worker {"id": "unregistered"}
2025-09-19 00:03:52,392 - INFO livekit.agents - process exiting {"reason": "", "pid": 53756, "inference": true}
2025-09-19 00:03:52,941 - ERROR livekit.agents - Error in _read_ipc_task
Traceback (most recent call last):
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\utils\aio\duplex_unix.py", line 35, in recv_bytes
len_bytes = await self._reader.readexactly(4)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\anandu.ashok\AppData\Local\Programs\Python\Python311\Lib\asyncio\streams.py", line 727, in readexactly
raise exceptions.IncompleteReadError(incomplete, n)
asyncio.exceptions.IncompleteReadError: 0 bytes read on a total of 4 expected bytes

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\utils\log.py", line 16, in async_fn_logs
return await fn(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\cli\watcher.py", line 120, in _read_ipc_task
msg = await channel.arecv_message(self._pch, proto.IPC_MESSAGES)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\ipc\channel.py", line 47, in arecv_message
return _read_message(await dplx.recv_bytes(), messages)
^^^^^^^^^^^^^^^^^^^^^^^
File "D:\Projects\MACHINE LEARNING\LLM\LIVEKIT\friday\friday\Lib\site-packages\livekit\agents\utils\aio\duplex_unix.py", line 43, in recv_bytes
raise DuplexClosed() from e
livekit.agents.utils.aio.duplex_unix.DuplexClosed

[TPatrawala90]

site-packages\livekit\agents\ipc\supervised_proc.py.

Go in the above file and find the code given below. It should be on line 167 and increase the timeout so there is more time for the connection. Changing it to 180 solved the issue for me.

logger.info("initializing process", extra=self.logging_extra())
start_time = time.perf_counter()
init_res = await asyncio.wait_for(
channel.arecv_message(self._pch, proto.IPC_MESSAGES),
timeout=180,
# timeout=self._opts.initialize_timeout,
)