Transport exceptions when client is disconnected unexpected (for example closing the browser tab) #1064

el07694 · 2024-01-28T16:14:34Z

el07694
Jan 28, 2024

Hello there,

I am getting some errors while trying to close a browser tab when the connection is full established.
The example i am running is on this repository.

How to go the error:

Run python server_video.py
Navigate to the ngrok url that ui of server_video.py provides in a QLineEdit.
Start a call from a browser.
Answer the call in pyqt5 app.
Close the browser tab
If the error doesn't happen in the console (server) after a few seconds repeat step 3-5 until reproduce.

Error message:

Traceback (most recent call last):
  File "C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py", line 1339, in _send_chunk
    await self.__transport._send_data(
  File "C:\Python\Lib\site-packages\aiortc\rtcdtlstransport.py", line 578, in _send_data
    raise ConnectionError("Cannot send encrypted data, not connected")
ConnectionError: Cannot send encrypted data, not connected

Task exception was never retrieved
future: <Task finished name='Task-2104' coro=<RTCSctpTransport._data_channel_flush() done, defined at C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py:1646> exception=ConnectionError('Cannot send encrypted data, not connected')>
Traceback (most recent call last):
  File "C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py", line 1677, in _data_channel_flush
    await self._send(
  File "C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py", line 1331, in _send
    await self._transmit()
  File "C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py", line 1557, in _transmit
    await self._send_chunk(chunk)
  File "C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py", line 1349, in _send_chunk
    raise e
  File "C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py", line 1339, in _send_chunk
    await self.__transport._send_data(
  File "C:\Python\Lib\site-packages\aiortc\rtcdtlstransport.py", line 578, in _send_data
    raise ConnectionError("Cannot send encrypted data, not connected")
ConnectionError: Cannot send encrypted data, not connected
Traceback (most recent call last):
  File "C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py", line 1339, in _send_chunk
    await self.__transport._send_data(
  File "C:\Python\Lib\site-packages\aiortc\rtcdtlstransport.py", line 578, in _send_data
    raise ConnectionError("Cannot send encrypted data, not connected")
ConnectionError: Cannot send encrypted data, not connected

What happens after that?

After that in some cases i cannot even revisit /index.html page.

How can i catch this errors and how can i resolve that?

jlaine · 2024-01-28T21:59:58Z

jlaine
Jan 28, 2024
Maintainer

Can you please indicate whether you can reproduce this on one of the examples we provide? If it's reproducible with our code I'm happy to investigate, but I cannot go debugging third party code.

0 replies

el07694 · 2024-01-28T23:25:29Z

el07694
Jan 28, 2024
Author

Ok, i will try to post tomorrow night

0 replies

el07694 · 2024-01-30T11:56:31Z

el07694
Jan 30, 2024
Author

Ok after a few tries i can reproduce a almost same error with server example.
The only change i made i server example is in server.py file i replace the default ip from 0.0.0.0 to 192.168.1.188
Then i run the python server.py command, i open the browser and i navigated to http://192.168.1.188:8080, i select to send video from the checkbox and i push the start button. The connection was established well, i can't see and video element playing (connectionstate doesn't go from connecting to connected) but this is not the only error (the light in the client area camera is enabled). After that i open a second tab, i close the first one and here is the output from console:


======== Running on http://192.168.1.188:8080 ========
(Press CTRL+C to quit)
INFO:pc:PeerConnection(ddbcdb13-5698-4eb3-9f43-c6a5a02ef310) Created for 192.168.1.188
INFO:pc:PeerConnection(ddbcdb13-5698-4eb3-9f43-c6a5a02ef310) Track audio received
INFO:pc:PeerConnection(ddbcdb13-5698-4eb3-9f43-c6a5a02ef310) Track video received
INFO:aioice.ice:Connection(3) Could not bind to 169.254.119.55 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(3) Could not bind to 169.254.248.136 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(4) Could not bind to 169.254.119.55 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(4) Could not bind to 169.254.248.136 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(0) Could not bind to 169.254.119.55 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(0) Could not bind to 169.254.248.136 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(3) Could not bind to 169.254.144.162 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(4) Could not bind to 169.254.144.162 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(0) Could not bind to 169.254.144.162 - [WinError 10049] The requested address is not valid in its context
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b08:7c00:d807:7791:5584:8e87', 58976) -> ('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 51182)) State.FROZEN -> State.WAITING
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 58979) -> ('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 51182)) State.FROZEN -> State.WAITING
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b2a:9700:2edd:267f:a8c1:a4c0', 58982) -> ('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 51182)) State.FROZEN -> State.WAITING
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b08:7c00:d807:7791:5584:8e87', 58976) -> ('2a02:587:4b08:7c00:d807:7791:5584:8e87', 51183)) State.FROZEN -> State.WAITING
INFO:aioice.ice:Connection(0) Check CandidatePair(('192.168.1.188', 58985) -> ('192.168.1.188', 51181)) State.FROZEN -> State.WAITING
INFO:pc:PeerConnection(ddbcdb13-5698-4eb3-9f43-c6a5a02ef310) Connection state is connecting
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b08:7c00:d807:7791:5584:8e87', 58976) -> ('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 51182)) State.WAITING -> State.IN_PROGRESS
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 58979) -> ('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 51182)) State.WAITING -> State.IN_PROGRESS
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b2a:9700:2edd:267f:a8c1:a4c0', 58982) -> ('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 51182)) State.WAITING -> State.IN_PROGRESS
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b08:7c00:d807:7791:5584:8e87', 58976) -> ('2a02:587:4b08:7c00:d807:7791:5584:8e87', 51183)) State.WAITING -> State.IN_PROGRESS
INFO:aioice.ice:Connection(0) Check CandidatePair(('192.168.1.188', 58985) -> ('192.168.1.188', 51181)) State.WAITING -> State.IN_PROGRESS
INFO:aioice.ice:Connection(0) Check CandidatePair(('192.168.1.188', 58985) -> ('192.168.1.188', 51181)) State.IN_PROGRESS -> State.SUCCEEDED
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b08:7c00:7523:c33b:cc49:66f9', 58979) -> ('2a02:587:4b08:7c00:d807:7791:5584:8e87', 51183)) State.FROZEN -> State.IN_PROGRESS
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b2a:9700:2edd:267f:a8c1:a4c0', 58982) -> ('2a02:587:4b08:7c00:d807:7791:5584:8e87', 51183)) State.FROZEN -> State.FAILED
INFO:aioice.ice:Connection(0) ICE completed
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b2a:9700:2edd:267f:a8c1:a4c0', 58982) -> ('2a02:587:4b08:7c00:d807:7791:5584:8e87', 51183)) State.FAILED -> State.IN_PROGRESS
INFO:aioice.ice:Connection(0) Check CandidatePair(('2a02:587:4b2a:9700:2edd:267f:a8c1:a4c0', 58982) -> ('2a02:587:4b08:7c00:d807:7791:5584:8e87', 51183)) State.IN_PROGRESS -> State.FAILED
INFO:aioice.ice:Connection(0) Consent to send expired
INFO:pc:PeerConnection(ddbcdb13-5698-4eb3-9f43-c6a5a02ef310) Connection state is failed
Traceback (most recent call last):
  File "C:\Python\Lib\site-packages\aiortc\rtcsctptransport.py", line 1339, in _send_chunk
    await self.__transport._send_data(
  File "C:\Python\Lib\site-packages\aiortc\rtcdtlstransport.py", line 578, in _send_data
    raise ConnectionError("Cannot send encrypted data, not connected")
ConnectionError: Cannot send encrypted data, not connected

INFO:pc:PeerConnection(ddbcdb13-5698-4eb3-9f43-c6a5a02ef310) Connection state is closed

The problem is related with the last lines: ConnectionError: Cannot send encrypted data, not connected

Tip: Try to hide the log messages, close the index.html tab (by opening a new tab and closing the previous) and wait the error to appear in server side.
When this error happens sometimes await pc.close() terminates well but some other never return a result (program freezes).

Also i cannot exit the server with ctrl+C without an error.

On possible solution is to use javascript onbeforeunload event to stop the communication from client.

Note that after few repeats: 9 or 10 times then there is a bigger related error.

First of all, can someone reproduce it?

0 replies

el07694 · 2024-02-12T14:00:46Z

el07694
Feb 12, 2024
Author

Any update?

0 replies

MatriQ · 2024-04-14T00:37:12Z

MatriQ
Apr 14, 2024

I faced the same issue when sometimes I close peer connection from aiortc, and it will block the whole progress.

0 replies

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Transport exceptions when client is disconnected unexpected (for example closing the browser tab) #1064

el07694 Jan 28, 2024

Replies: 5 comments

jlaine Jan 28, 2024 Maintainer

el07694 Jan 28, 2024 Author

el07694 Jan 30, 2024 Author

el07694 Feb 12, 2024 Author

MatriQ Apr 14, 2024

el07694
Jan 28, 2024

jlaine
Jan 28, 2024
Maintainer

el07694
Jan 28, 2024
Author

el07694
Jan 30, 2024
Author

el07694
Feb 12, 2024
Author

MatriQ
Apr 14, 2024