BTW, I set icap_service_failure_limit -1 because If I don't the HTTP clients get the ERR_ICAP_FAILURE page for *a very long time* if I restart the c-icap service. I have no idea how much they would have to wait because I can't afford users seeing this page for more than a minute. The following test was done in 2 minutes with the default icap_service_failure_limit: # /etc/init.d/squid reload # /etc/init.d/c-icap restart # squidclient mgr:info HTTP/1.1 200 OK Server: squid Mime-Version: 1.0 Date: Thu, 21 Dec 2017 08:07:07 GMT Content-Type: text/plain;charset=utf-8 Expires: Thu, 21 Dec 2017 08:07:07 GMT Last-Modified: Thu, 21 Dec 2017 08:07:07 GMT X-Cache: MISS from inf-fw2 X-Cache-Lookup: MISS from inf-fw2:3128 Connection: close Squid Object Cache: Version 3.5.27-20171101-re69e56c Build Info: Service Name: squid Start Time: Mon, 18 Dec 2017 08:29:33 GMT Current Time: Thu, 21 Dec 2017 08:07:07 GMT Connection information for squid: Number of clients accessing cache: 569 Number of HTTP requests received: 3381083 Number of ICP messages received: 0 Number of ICP messages sent: 0 Number of queued ICP replies: 0 Number of HTCP messages received: 0 Number of HTCP messages sent: 0 Request failure ratio: 0.00 Average HTTP requests per minute since start: 786.7 Average ICP messages per minute since start: 0.0 Select loop called: 93431818 times, 2.760 ms avg Cache information for squid: Hits as % of all requests: 5min: 0.9%, 60min: 2.0% Hits as % of bytes sent: 5min: 5.2%, 60min: 9.5% Memory hits as % of hit requests: 5min: 88.4%, 60min: 60.2% Disk hits as % of hit requests: 5min: 0.0%, 60min: 0.1% Storage Swap size: 29156 KB Storage Swap capacity: 89.0% used, 11.0% free Storage Mem size: 30648 KB Storage Mem capacity: 93.5% used, 6.5% free Mean Object Size: 18.03 KB Requests given to unlinkd: 49975 Median Service Times (seconds) 5 min 60 min: HTTP Requests (All): 0.05633 0.04047 Cache Misses: 0.10281 0.11465 Cache Hits: 0.00000 0.00000 Near Hits: 0.01745 0.01955 Not-Modified Replies: 0.00000 0.00000 DNS Lookups: 0.04048 0.03868 ICP Queries: 0.00000 0.00000 Resource usage for squid: UP Time: 257853.454 seconds CPU Time: 6005.270 seconds CPU Usage: 2.33% CPU Usage, 5 minute avg: 6.76% CPU Usage, 60 minute avg: 2.99% Maximum Resident Size: 5549424 KB Page faults with physical i/o: 0 Memory accounted for: Total accounted: 1004217 KB memPoolAlloc calls: 980681181 memPoolFree calls: 999432183 File descriptor usage for squid: Maximum number of file descriptors: 65536 Largest file desc currently in use: 4399 Number of file desc currently in use: 4052 Files queued for open: 0 Available number of file descriptors: 61484 Reserved number of file descriptors: 100 Store Disk files open: 0 Internal Data Structures: 2074 StoreEntries 1911 StoreEntries with MemObjects 1687 Hot Object Cache Items 1617 on-disk objects Two minutes later and clients are still seeing ERR_ICAP_FAILURE, so I'm setting back to icap_service_failure_limit -1. # /etc/init.d/squid reload # squidclient mgr:info HTTP/1.1 200 OK Server: squid Mime-Version: 1.0 Date: Thu, 21 Dec 2017 08:09:26 GMT Content-Type: text/plain;charset=utf-8 Expires: Thu, 21 Dec 2017 08:09:26 GMT Last-Modified: Thu, 21 Dec 2017 08:09:26 GMT X-Cache: MISS from inf-fw2 X-Cache-Lookup: MISS from inf-fw2:3128 Connection: close Squid Object Cache: Version 3.5.27-20171101-re69e56c Build Info: Service Name: squid Start Time: Mon, 18 Dec 2017 08:29:33 GMT Current Time: Thu, 21 Dec 2017 08:09:26 GMT Connection information for squid: Number of clients accessing cache: 569 Number of HTTP requests received: 3382478 Number of ICP messages received: 0 Number of ICP messages sent: 0 Number of queued ICP replies: 0 Number of HTCP messages received: 0 Number of HTCP messages sent: 0 Request failure ratio: 0.00 Average HTTP requests per minute since start: 786.6 Average ICP messages per minute since start: 0.0 Select loop called: 93457469 times, 2.761 ms avg Cache information for squid: Hits as % of all requests: 5min: 1.2%, 60min: 2.0% Hits as % of bytes sent: 5min: 10.9%, 60min: 9.7% Memory hits as % of hit requests: 5min: 88.3%, 60min: 60.1% Disk hits as % of hit requests: 5min: 0.0%, 60min: 0.1% Storage Swap size: 29156 KB Storage Swap capacity: 89.0% used, 11.0% free Storage Mem size: 30648 KB Storage Mem capacity: 93.5% used, 6.5% free Mean Object Size: 18.03 KB Requests given to unlinkd: 49975 Median Service Times (seconds) 5 min 60 min: HTTP Requests (All): 0.05046 0.04047 Cache Misses: 0.11465 0.11465 Cache Hits: 0.00000 0.00000 Near Hits: 0.00000 0.01955 Not-Modified Replies: 0.00000 0.00000 DNS Lookups: 0.04237 0.03868 ICP Queries: 0.00000 0.00000 Resource usage for squid: UP Time: 257992.456 seconds CPU Time: 6009.530 seconds CPU Usage: 2.33% CPU Usage, 5 minute avg: 4.90% CPU Usage, 60 minute avg: 2.98% Maximum Resident Size: 5549728 KB Page faults with physical i/o: 0 Memory accounted for: Total accounted: 997578 KB memPoolAlloc calls: 980907766 memPoolFree calls: 999669215 File descriptor usage for squid: Maximum number of file descriptors: 65536 Largest file desc currently in use: 4399 Number of file desc currently in use: 3676 Files queued for open: 0 Available number of file descriptors: 61860 Reserved number of file descriptors: 100 Store Disk files open: 0 Internal Data Structures: 1895 StoreEntries 1732 StoreEntries with MemObjects 1687 Hot Object Cache Items 1617 on-disk objects Clients are now browsing, and squid/c-icap are apparently communicating. 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