Just went through a hellish debugging process trying to figure out why the server list wouldn't appear. I thought maybe it was a port forwarding issue and went down a deep VPN rabbithole that yielded no results. I am using a Lutris install on Ubuntu. Since this workaround isn't anywhere in this Help section, I just want to add the solution here:
Download this .zip and extract.
https://github.com/Zaela/p99-login-middlemand
In the terminal, navigate to the folder you extracted and run the command make
Now go to your EQ install location and find the file eqhost.txt
Update its contents to read:
Host=localhost:5998```
The servers should now appear.