The server certificate store for holding partner certificates is full. The number of certificates written to the store (%1) ...

The server certificate store for holding partner certificates is full.

The number of certificates written to the store (%1) reached the configured limit.  No more certificates will be written to the store until the next restart.
Cause: The server certificate store for holding peer certificates already has the maximum number of certificates permitted by configuration.
Resolution:
Delete the certificates from that store using Certificate Manager or using the LCSCertUtil tool supplied as part of the resource kit.