|From what I have read it can be related to DNS but I don’t think it’s that in our case. |
If it were just one client stalling out here, I'd suspect the client. If it's all of them, then it's more likely to be your DNS setup.
So what troubleshooting steps have you taken that makes you think it isn't DNS? If you haven't actually done any troubleshooting on DNS and are just assuming it's not.....then I'd recommend you start by looking at DNS.
First, check to ensure the clients have the correct DNS address. Then check to ensure DNS is setup correctly and your records are correct for the clients.
How long have you had this domain setup? Has this issue always existed or is it new? If new, what, if anything, did you change on the DC/clients prior to the issue starting?
I think there is a service or setting somewhere, either on the client or DC, which can prevent the start-up dialogue boxes appearing at all
Which dialogue boxes are you talking about?