Adding a server to a DAG, Operation fails with Error 0x6f7

Error:

When you trying to add members to the DAG (Database Availability Group) you get the error as shown below:

Solution:

As this is in my testlab I didn’t assign a default gateway to the MAPI network adapter. Go to the properties of TCP/IP and add in the DG, after this you will be able to add the servers to the DAG.

Hope it helps.