vCSA 5.5 won’t join AD Domain‏

Just a quick post on something that was not immediately obvious when it happened to me.

When deploying  vCSA 5.5 and trying to add it to the domain, I was presented with the following error.

I immediately did all the all the usual checks, making sure it had a static IP and correct DNS servers etc..

The one thing missing however was a FQDN for the hostname (in the network tab).

All I had was “vCSAname”

But what was required to join a domain was “vCSAname.domain.local”

After I applied this change the vCSA connected to the domain without a problem.

As always with these niggles its simple when you know how!