Fixing SQL AG Routing "Cannot find host" using packet analysis (and a spell checker)

, 2017-11-30

I was setting up an availability group listener recently and when I tried to connect to the listener I got an error message to say “The host cannot be found” after the usual 15 seconds connection delay.

I checked the usual thing like TCP was enabled on the replicas and that routing was configured, but every time I tried I kept getting the “The host cannot be found” error. Now, I don’t know about you, but I find error messages like this completely infuriating especially when I knew the hostname of the listener resolved because I could ping the damn thing (and then connect straight to the IP address.

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