Can you try as mentioned below:
VMware Site Recovery Manager 5.1 Release Notes
Generic Error Message Is Displayed When Server Pairing Fails Due to Certificate Policy Strictness
Attempts to pair servers between sites might fail, displaying the following error message:Site pairing or break operation failed. Details: VRM Server generic error. This error might occur when one site being configured to use a strict certificate policy and the other site being configured to use a lenient certificate policy. In such a case, the pairing should fail, as it does. After such a failure, modify the lenient
The @SRM_Guru Blog: The ultra-frustrating "Site pairing or break operation failed." error