I am a little bit unsure in which category this would fit best, so I put it here.
I have this really odd problem with my webservers that keeps happening, mostly during evenings, when I’ve been at the PC for a while. Although I can’t say for certain that time of day or anything like that has a role in this.
I use Opera as my daily web browser, and at some point during the day, when I’m trying to access my webservers, I start to receive an error ERR_CONNECTION_TIMED_OUT. This may happen to only one of my webservers, a few of them, but most often all of them at the same time. This problem may also resolve itself after a while.
However, if I try to reach the same webserver from a different browser, like Firefox or Chrome, there is no issue. The issue stays isolated to the Opera browser it seems. The webservers do have an nginx reverseproxy infront of them. And when this problem occurs, I don’t see any incoming requests in the logs on the reverseproxy from the Opera browser, suggesting that the problem occurs before being redirected by the nginx server? I also don’t see any error logs or similar anywhere.
I was able to find some potentially interesting stuff from the dev console in the browser, provided in a screenshot below.
If anyone has got any input to this, on how to continue troubleshooting, or things to check, that would be greatly appreciated! And if something in this brief explanation is unclear, please let me know and I will try to give more information and context.
Screenshot from the dev console in my Opera browser when trying to reach my Grafana server:
