Code:
2018/06/05 21:26:17 kid1| Starting Squid Cache version 3.5.27 for amd64-portbld-freebsd11.1...
2018/06/05 21:26:17 kid1| Service Name: squid
2018/06/05 21:26:17 kid1| Process ID 96410
2018/06/05 21:26:17 kid1| Process Roles: worker
2018/06/05 21:26:17 kid1| With 942183 file descriptors available
2018/06/05 21:26:17 kid1| Initializing IP Cache...
2018/06/05 21:26:17 kid1| DNS Socket created at 0.0.0.0, FD 6
2018/06/05 21:26:17 kid1| Adding nameserver x.x.x.x from /etc/resolv.conf
2018/06/05 21:26:18 kid1| Logfile: opening log daemon:/var/log/squid/access.log
2018/06/05 21:26:18 kid1| Logfile Daemon: opening log /var/log/squid/access.log
2018/06/05 21:26:18 kid1| Unlinkd pipe opened on FD 13
2018/06/05 21:26:18 kid1| Local cache digest enabled; rebuild/rewrite every 3600/3600 sec
2018/06/05 21:26:18 kid1| Store logging disabled
2018/06/05 21:26:18 kid1| Swap maxSize 102400 + 262144 KB, estimated 28041 objects
2018/06/05 21:26:18 kid1| Target number of buckets: 1402
2018/06/05 21:26:18 kid1| Using 8192 Store buckets
2018/06/05 21:26:18 kid1| Max Mem size: 262144 KB
2018/06/05 21:26:18 kid1| Max Swap size: 102400 KB
2018/06/05 21:26:18 kid1| Rebuilding storage in /var/squid/cache (no log)
2018/06/05 21:26:18 kid1| Using Least Load store dir selection
2018/06/05 21:26:18 kid1| Set Current Directory to /var/squid/cache
2018/06/05 21:26:18 kid1| Finished loading MIME types and icons.
2018/06/05 21:26:18 kid1| HTCP Disabled.
2018/06/05 21:26:18 kid1| sendto FD 16: (13) Permission denied
2018/06/05 21:26:18 kid1| ipcCreate: CHILD: hello write test failed
2018/06/05 21:26:18 kid1| sendto FD 16: (13) Permission denied
2018/06/05 21:26:18 kid1| ipcCreate: CHILD: hello write test failed
Damit finde ich keinen Lösungsansatz.

google meint zwar ipv6 aktivieren...aber ich habs nicht geblockt und squid mit ipv6 gebaut.