@lkh @SDF@social.sdfeu.org Interesting. The gopher server had been restarted a few days or hours after that post of mine, but I didn't get the time to comment here on that. But indeed now at least some services are unreachable again, including IMAP, as I'm getting a connection error rather than the expired certificate error.

Was there some issue with social.sdf.org, seeing that your mention of @SDF@social.sdf.org does not show up as a link, even though I can load social.sdf.org right now? (that said, issues with social.sdf.org aren't exactly rare, perhaps a bigger issue here is mastodon just not handling these issues better and not handling it as a mention even when (I presume) the remote server is not reachable)