The fact that other sites are working properly with the same access
types indicates a problem outside of Squid which affects it.
ServFail DNS result, PMTU or routing issues come to mind. If one
particular remote IP is inaccessible and the link hanging it can prevent
Squid having time to do failover recovery. connect_timeout determines
how much time is allowed for each attempt.
It's also worth checking your access.log and IP-cache (squidclient
mgr:ipcache) to see what addresses Squid has on record for
bugs.debian.org vs other similar working domains (ie www.debian.org) and
what it thinks of each IP.
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