I have a Server with 10 SQL Server named instances.
On 3 of them (the last 3 I've installed) I am unable to connect remotely using ServerName\InstanceName.
However, I am able to access remotely to these 3 Instances with:
- CName that points to the Instance IP Address
- ServerName, InstancePort
Locally, on the Server where my Instances are installed I am able to connect with ServerName\InstanceName.
All other instances work fine, i.e. I am able to connect remotely with ServerName\InstanceName.
My SQL Server Browser Service is running and I have a firewall rule to allow connections to UDP 1434 (otherwise the other 7 Instances would not work either). The Ports from all the Instances are also open on my Firewall (otherwise I would not be able to connect to using the CName (IP Address of the Instance).
I am running the latest build, SQL Server 2016 SP2 CU3 (13.0.5216.0).
I have nothing on my SQL Server Log, Server Log and Firewall Log.
Has anyone experience something similar or can give me a hint on what I should be looking at?