Just downloaded and unable to login

Hello Warmane team!

I just downloaded the Wotlk client and attempted to log into my account through wow.exe and got the following error message:
"Could not log into World of Warcraft at this time. Please try again later."

Can you please advise me on how to resolve that and log in successfully?

Merry Christmas and best regards,
Petar Ivanov from Bulgaria

Please, remove your real name from the post.

Double check realmlist is right.
Others have had the same issue as you. You could check other threads related to not being able to connect, and read for solutions.