I've done the following and this seems to have solved the issue for me:
1) added a line in /etc/default/squid
SQUID_ARGS='-D'
(disable startup DNS checks, since my server is not always fully started by the time squid starts)
I'm fairly sure that squid used to be started with -D by default and I'd see it as a regression
that it isn't now.
2) replaced "restart squid" with "reload squid" in /etc/resolvconf/update-libc.d/squid.
I've done the following and this seems to have solved the issue for me:
1) added a line in /etc/default/squid
SQUID_ARGS='-D'
(disable startup DNS checks, since my server is not always fully started by the time squid starts)
I'm fairly sure that squid used to be started with -D by default and I'd see it as a regression
that it isn't now.
2) replaced "restart squid" with "reload squid" in /etc/resolvconf /update- libc.d/ squid.