Very recently the IO::Socket::SSL perl module was updated (somewhere between versions 1.15 and 1.17) with a big change, to default to IPV6 rather than IPV4 if IO::Socket::INET6 was installed. On many servers this is causing an issue since they are by default IPV6 enabled on distros like Centos. The fix is simple and just released (do a forced update in WHM or let it update with upcp tonight) , however if you are already affected, the self update command won't work so you need to edit the cpgsd.pl script itself and restart it. Near the top of /var/cpanel/cpgsd.pl (near line 68) you will see the folllowing line:
Change this to
use IO::Socket::SSL qw(inet4);
Then restart cpgsd
That should take care of it. Put in a ticket if you run into problems with it.