Main Location endpoints not reporting "Cannot verify peer's SSL certificate, unknown CA"

I have just migrated our Enterprise Console from one server to another, all seemed to go well. All the endpoints are all reporting back to their local SUM apart from the endpoints in the location of the new Enterprise Console/SUM.

It must be something to do with the certificate on the new server as getting this error below reported in the Router log on the failing endpoints. I've tried reinstalling Sophos endpoint software on the clients, both from the new console and from the new share, it installs fine and updates just doesn't report back to the new server.

23.07.2015 19:56:56 076C W Failed to get certificate, retrying in 600 seconds
23.07.2015 20:07:05 076C I Getting parent router IOR from 200.100.1.28:8192
23.07.2015 20:07:05 076C I Getting a new router certificate...
23.07.2015 20:07:05 076C W SSL connection alert, peer address 200.100.1.28
23.07.2015 20:07:05 076C W Cannot verify peer's SSL certificate, unknown CA
23.07.2015 20:07:05 076C E Router::ReportInvalidCertificate: Caught Empty IOR string from iiopAddressesInIOR
23.07.2015 20:07:05 076C E ACE_SSL (4544|1900) error code: 336134278 - error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
23.07.2015 20:07:05 076C W SSL connection alert, peer address 200.100.1.28
23.07.2015 20:07:05 076C W Cannot verify peer's SSL certificate, unknown CA
23.07.2015 20:07:05 076C E Router::ReportInvalidCertificate: Caught Empty IOR string from iiopAddressesInIOR
23.07.2015 20:07:05 076C E ACE_SSL (4544|1900) error code: 336134278 - error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
23.07.2015 20:07:05 076C E Router::GetCertificate: Caught CORBA system exception, ID 'IDL:omg.org/CORBA/TRANSIENT:1.0'
OMG minor code (2), described as '*unknown description*', completed = NO

How can I fix the certificate on the new server?

Thanks