Here is this morning's attempt at starting squid...first cache.log and then 
messages. This is the host where squid host that was working for few weeks, and 
I think a "yum update" added something into the mix. I am not so sure this is a 
IPv6 issue, actually. Any advice appreciated.

My debug setting:
        debug_options 28,9

# cat cache.log
2012/05/21 12:18:25.286| ACL::~ACL: '
2012/05/21 12:18:25.286| ACL::~ACL: '
2012/05/21 12:18:25.286| ACL::~ACL: '
2012/05/21 12:18:25.286| ACL::~ACL: '
2012/05/21 12:18:25 kid1| Starting Squid Cache version 3.2.0.17 for 
x86_64-unknown-linux-gnu...
2012/05/21 12:18:26 kid1| Address.cc(958) GetSockAddr: Ip::Address::GetSockAddr 
: Cannot convert non-IPv4 to IPv4. from [::]
2012/05/21 12:18:29 kid1| Starting Squid Cache version 3.2.0.17 for 
x86_64-unknown-linux-gnu...
2012/05/21 12:18:30 kid1| Address.cc(958) GetSockAddr: Ip::Address::GetSockAddr 
: Cannot convert non-IPv4 to IPv4. from [::]
2012/05/21 12:18:33 kid1| Starting Squid Cache version 3.2.0.17 for 
x86_64-unknown-linux-gnu...
2012/05/21 12:18:34 kid1| Address.cc(958) GetSockAddr: Ip::Address::GetSockAddr 
: Cannot convert non-IPv4 to IPv4. from [::]
2012/05/21 12:18:37 kid1| Starting Squid Cache version 3.2.0.17 for 
x86_64-unknown-linux-gnu...
2012/05/21 12:18:38 kid1| Address.cc(958) GetSockAddr: Ip::Address::GetSockAddr 
: Cannot convert non-IPv4 to IPv4. from [::]
2012/05/21 12:18:41 kid1| Starting Squid Cache version 3.2.0.17 for 
x86_64-unknown-linux-gnu...
2012/05/21 12:18:42 kid1| Address.cc(958) GetSockAddr: Ip::Address::GetSockAddr 
: Cannot convert non-IPv4 to IPv4. from [::]
2012/05/21 12:18:42.335| ACL::~ACL: '
2012/05/21 12:18:42.335| ACL::~ACL: '
2012/05/21 12:18:42.335| ACL::~ACL: '
2012/05/21 12:18:42.335| ACL::~ACL: '
2012/05/21 12:18:42.335| ACL::~ACL: '
2012/05/21 12:18:42.335| ACL::~ACL: '

# grep squid messages
May 21 12:18:25 splprx01 squid[17095]: Squid Parent: will start 1 kids
May 21 12:18:25 splprx01 squid[17095]: Squid Parent: (squid-1) process 17098 
started
May 21 12:18:25 splprx01 squid[17098]: Starting Squid Cache version 3.2.0.17 
for x86_64-unknown-linux-gnu...
May 21 12:18:26 splprx01 squid[17098]: Address.cc(958) GetSockAddr: 
Ip::Address::GetSockAddr : Cannot convert non-IPv4 to IPv4. from [::]
May 21 12:18:26 splprx01 squid[17095]: Squid Parent: (squid-1) process 17098 
exited due to signal 6 with status 0
May 21 12:18:29 splprx01 squid[17095]: Squid Parent: (squid-1) process 17101 
started
May 21 12:18:29 splprx01 squid[17101]: Starting Squid Cache version 3.2.0.17 
for x86_64-unknown-linux-gnu...
May 21 12:18:30 splprx01 squid[17101]: Address.cc(958) GetSockAddr: 
Ip::Address::GetSockAddr : Cannot convert non-IPv4 to IPv4. from [::]
May 21 12:18:30 splprx01 squid[17095]: Squid Parent: (squid-1) process 17101 
exited due to signal 6 with status 0
May 21 12:18:33 splprx01 squid[17095]: Squid Parent: (squid-1) process 17104 
started
May 21 12:18:33 splprx01 squid[17104]: Starting Squid Cache version 3.2.0.17 
for x86_64-unknown-linux-gnu...
May 21 12:18:34 splprx01 squid[17104]: Address.cc(958) GetSockAddr: 
Ip::Address::GetSockAddr : Cannot convert non-IPv4 to IPv4. from [::]
May 21 12:18:34 splprx01 squid[17095]: Squid Parent: (squid-1) process 17104 
exited due to signal 6 with status 0
May 21 12:18:37 splprx01 squid[17095]: Squid Parent: (squid-1) process 17107 
started
May 21 12:18:37 splprx01 squid[17107]: Starting Squid Cache version 3.2.0.17 
for x86_64-unknown-linux-gnu...
May 21 12:18:38 splprx01 squid[17107]: Address.cc(958) GetSockAddr: 
Ip::Address::GetSockAddr : Cannot convert non-IPv4 to IPv4. from [::]
May 21 12:18:38 splprx01 squid[17095]: Squid Parent: (squid-1) process 17107 
exited due to signal 6 with status 0
May 21 12:18:41 splprx01 squid[17095]: Squid Parent: (squid-1) process 17112 
started
May 21 12:18:41 splprx01 squid[17112]: Starting Squid Cache version 3.2.0.17 
for x86_64-unknown-linux-gnu...
May 21 12:18:42 splprx01 squid[17112]: Address.cc(958) GetSockAddr: 
Ip::Address::GetSockAddr : Cannot convert non-IPv4 to IPv4. from [::]
May 21 12:18:42 splprx01 squid[17095]: Squid Parent: (squid-1) process 17112 
exited due to signal 6 with status 0
May 21 12:18:42 splprx01 squid[17095]: Squid Parent: (squid-1) process 17112 
will not be restarted due to repeated, frequent failures
May 21 12:18:42 splprx01 squid[17095]: Exiting due to repeated, frequent 
failures

-----Original Message-----
From: Amos Jeffries [mailto:[email protected]] 
Sent: Saturday, May 19, 2012 7:12 PM
To: [email protected]
Subject: Re: [squid-users] IPv6 error prevents Squid start

On 20/05/2012 2:34 a.m., Zill, Gregory (OMA-GIS) wrote:
> Added debug_options 28,9 to squid.conf
>
> May 19 11:20:08 splprx01 ntpd[1593]: synchronized to 10.226.0.19, 
> stratum 3 May 19 11:20:08 splprx01 ntpd[1593]: time reset -0.311298 s 
> May 19 11:20:08 splprx01 ntpd[1593]: kernel time sync status change 
> 2001 May 19 11:29:01 splprx01 ntpd[1593]: synchronized to 10.226.0.19, 
> stratum 3 May 19 11:32:14 splprx01 squid[2018]: Squid Parent: will 
> start 1 kids May 19 11:32:14 splprx01 squid[2018]: Squid Parent: 
> (squid-1) process 2021 started May 19 11:32:14 splprx01 squid[2021]: Starting 
> Squid Cache version 3.2.0.17 for x86_64-unknown-linux-gnu...
> May 19 11:32:15 splprx01 squid[2021]: Address.cc(958) GetSockAddr: 
> Ip::Address::GetSockAddr : Cannot convert non-IPv4 to IPv4. from [::] 
> May 19 11:32:15 splprx01 squid[2018]: Squid Parent: (squid-1) process 
> 2021 exited due to signal 6 with status 0

This is the kernel / syslog trace of what the kernel sees happening. You need 
to look in squid cache.log for the Squid debug messages.

Amos
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