Container is not visible in PVA after upgrade of PVA Agent to version 6.0-2145.
A special configuration file of the container is absent from
Check .owner file in container private area. It should contain the full hostname of the server.
~# cat /vz/private/1000/.owner pcs1.example.com
If it does not include the full hostname, add it manually :
~# echo `hostname -f` > /vz/private/<CTID>/.owner