Since May 1st, 2026, two of my servers are emailing these errors: Subject: Cron <root@server2> "/root/.acme.sh"/acme.sh --cron --home "/root/.acme.sh" > /dev/null [Fri May 1 10:34:24 AM EDT 2026] Please refer to https://curl.haxx.se/libcurl/c/libcurl-errors.html for error code: 28 Server2 has emailed twice (May 1st, May 5th) Server 3 has emailed twice (May 2nd, May 3rd) Nothing since the 5th though. I have two other servers that so far, are not giving me this error via email. All boxes are Debian 12 and during the first week of the month I always do a: apt-get update && apt-get upgrade My version of ISPConfig is 3.3.0p3 Should I updated to 3.3.1p1 ? Thanks.
Your issue currently looks more likely a time-to-time temporary network timeout, possibly IPv6-related, but definitely not an ISPConfig core failure. The errors stopped respectively after May 3 and 5, for two two servers, while others did not report any. Cron retries normally recover automatically, so I think there is nothing much to worry about. In any event, updating to ISPConfig 3.3.1p1 is still recommended for Debian 12 systems, as that what I'd always do at least, but I would treat it as maintenance / upgrading as it is not the direct fix for the mentioned curl error 28. Similarly if you want to the same for your Debian to version 13, but for that, I think the best is may be via migration to it, though a direct upgrade should work fine too. Thinking out loud, may be I should check with my servers whether they can already be upgraded to 26.04, but may be should put it on hold because I cannot find any news about ISPConfig support to it yet.
