Bitrix Socket connection error - how to fix?

Question

1C-Bitrix

Hello!
Integration with zenconnector was set up on the Bitrix website.
Everything worked fine, but suddenly fell off. There were no changes in the code.
I started debugging, before sending the request, everything is quite cool.

However, after there was an attempt to make a request, I looked at the $httpClient object in the logs and saw the following: Tell me

, please, what could be the trouble?