On 2026-03-17 10:04, Alex Rousskov wrote:
On 2026-03-17 03:04, Dieter Bloms wrote:

I run squid 7.5 on debian trixie as follow: ...
It's working very well, but sometimes (very rarely) the ICAP error page ERR_ICAP_FAILURE is displayed.
I've created network dumps and also run Squid in debug mode.
It looks to me as though Squid isn’t sending all the data to the ICAP scanner, causing it to terminate the connection after the configured 5-minute timeout. I’ve tried two ICAP virus scanners (c-icap and Avira ICAP Proxy https://oem.avira.com/en/solutions/anti-malware#ICAP),
and both exhibited the same behavior.

Is this a known issue, or should I file a bug report?

FWIW, my quick search did not find any recently changed ICAP bugs with similar symptoms. I can volunteer to look through your debugging cache.log if you can share a pointer to a compressed file with me, privately if needed. I prefer ALL,9 logs from the affected worker, but will look at what you have.

Thank you for sharing those debugging logs! The logs confirmed that this is a known bug that was fixed in master/v8 a year ago. It is now fixed in Squid v7 as well (commit 8a1c5cf). That v7 fix should become a part of the future v7.6 release.

Alex.

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