There is no site attached to that - but you could not ping that address in the logs. So the next question would be, was it just by coincidence, was it random or was it part of the problem. Your opponent could also just leave or is still downloading the map and quits for whatever reason.
Sorry that I can not pinpoint the error, but it is a very general error and hard to pinpoint.
The next steps could be:
- Remove everything related to FAF
- Install FAF again
- Reproduce the error and post the logs
If it still happens frequently, then create a bug report on GitHub and a developer can look into this.