>Hi Frank,
>
>When installing Express be sure you selected Network Service user, not admin or another. If you select admin for user, you can access SQL from server but not from clients. SQL Express is asking user during installation, care about that.
>

Hi Metin,

it may have something to do with me installing a named instance and not a default instance. This apparently uses dynamic ports, not the default 1433. I switched to a static port and was able to connect using a string like: tcp:192.168.XXX.XXX,1433\SQLExpress

Now I am trying to work out why using a string like GFSL01\SQLExpress won't work.

I did look at the SQL Server service and see that the Built-in account is Local System, is that what you are suggesting should be Network Service?