squid does not accept WCCP of Cisco router since 3.5.27-1ubuntu1.12

Bug #1952158 reported by amk
This bug affects 1 person
Affects Status Importance Assigned to Milestone
squid (Ubuntu)

Bug Description

WCCP peering between squid and CIsco IOS 15.8(3)M2 stopped as of

Start-Date: 2021-10-07 06:27:37
Commandline: /usr/bin/unattended-upgrade
Upgrade: squid-common:amd64 (3.5.27-1ubuntu1.11, 3.5.27-1ubuntu1.12)

1) The release of Ubuntu you are using: 18.04
2) The version of the package you are using: 3.5.27-1ubuntu1.12
3) What you expected to happen:

Unattended upgrade will not break working setup. Valid wccp packets from the router continue to get accepted and processed by squid.

4) What happened instead

The squid cache.log is logging a loop of ERROR messages:

ERROR: Ignoring WCCPv2 message: ntohl(wccp2_i_see_you.type) == WCCP2_I_SEE_YOU
ERROR: Ignoring WCCPv2 message: !security_info
ERROR: Ignoring WCCPv2 message: !security_info
ERROR: Ignoring WCCPv2 message: !security_info

Router logged Oct 7 04:28:45.918: %WCCP-1-SERVICELOST: Service web-cache lost on WCCP client x.x.x.x
Since then debug wccp logs periodically WCCP-EVNT:IPv4:S0: HIA from x.x.x.x with bad rcv_id 0 (expected yy)

wccp service detail shows: WCCP Client information: State: NOT Usable (initializing)

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