IDM Replica error after reboot

I rebooted both IPA server and the replica server. After reboot, I am getting the following errors on the replica server.

Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Cannot contact any KDC for realm 'XXX.XX.XXX'. Unable to create GSSAPI-enc...AP connection.

Anyone experienced this type of error before?