По логам вроде все нормально а подключения нет, service restart squid не помогает, только если сервер целиком перезагрузить то начинает работать.
# service squid status squid (pid ***** is running...
2018/04/23 05:34:12| Starting Squid Cache version 3.1.23 for x86_64-redhat-linux-gnu...
2018/04/23 05:34:12| Process ID 47***
2018/04/23 05:34:12| With 10*** file descriptors available
2018/04/23 05:34:12| Initializing IP Cache...
2018/04/23 05:34:12| DNS Socket created at [::], FD 8
2018/04/23 05:34:12| DNS Socket created at 0.0.0.0, FD 9
2018/04/23 05:34:12| Adding nameserver ******.*****.* from /etc/resolv.conf
2018/04/23 05:34:12| Adding nameserver ******.*****.* from /etc/resolv.conf
2018/04/23 05:34:12| User-Agent logging is disabled.
2018/04/23 05:34:12| Referer logging is disabled.
2018/04/23 05:34:13| Unlinkd pipe opened on FD 14
2018/04/23 05:34:13| Local cache digest enabled; rebuild/rewrite every 3600/3600 sec
2018/04/23 05:34:13| Store logging disabled
2018/04/23 05:34:13| Swap maxSize 0 + 262144 KB, estimated 20164 objects
2018/04/23 05:34:13| Target number of buckets: 1008
2018/04/23 05:34:13| Using 8192 Store buckets
2018/04/23 05:34:13| Max Mem size: ***144 KB
2018/04/23 05:34:13| Max Swap size: 0 KB
2018/04/23 05:34:13| Using Least Load store dir selection
2018/04/23 05:34:13| Set Current Directory to /var/spool/squid
2018/04/23 05:34:13| Loaded Icons.
2018/04/23 05:34:13| Accepting HTTP connections at [::]:****, FD 15.
2018/04/23 05:34:13| HTCP Disabled.
2018/04/23 05:34:13| Squid plugin modules loaded: 0
2018/04/23 05:34:13| Adaptation support is off.
2018/04/23 05:34:13| Ready to serve requests.
2018/04/23 05:34:14| storeLateRelease: released 0 objects
