Hi,
Hope you are doing well.
Under Configuration->Proxies->Advanced Settings-> We have timeout for errors for long running connections with the value 24 hours.
The Rule to Block on All Errors in Error Handler should be present/enabled. If it is switched off which will lead to keeping connections alive for always. So implementing a long running connection handler is advised if it is disabled or not present currently.
It works for ICAP as well when MWG is acting as ICAP server.
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Regards
Alok Sarda