During SRM Site pairing from OnPrem to VMC SDDC, below error might be seen
This document assumes that you have fresh deployment of OnPrem SRM and it has not been configured/paired with any site. If you have an existing configured/paired production/development/test OnPrem SRM instance, please contact support and do not proceed.
In the above screenshot you should have registered OnPrem vSphere Replication appliance as well however this document focuses on SRM DNS error.
Cloud SRM reaches out to OnPrem PSC and checks for OnPrem SRM url, to setup site pairing with.
If the OnPrem SRM is registered with hostname and not FQDN, above error might come up.
High level steps that we need to follow
Verify OnPrem SRM is registered with OnPrem PSC via hostname.
Unregister OnPrem SRM with OnPrem PSC
Change the OnPrem hostname to fqdn
Generate new self signed cert for OnPrem SRM
Register OnPrem SRM with OnPrem PSC via FQDN
Complete SRM site pairing operation
To verify if the OnPrem SRM is registered with hostname and not with FQDN ; navigate to OnPrem PSC by editing below url