an error when I try to browse themes, how can I fix this?

[monsieur]

Hello, when I go into admin panel and try to browse themes, I get that error:

The following errors were encountered:

• There was a problem communicating with the MyBB themes server. Please try again in a few minutes.
  

Why do I get this? tnx

[nixer55]

The modules in the ACP just provide a quick way to browse through plugins and themes, you still have to download and install them manually.  In the meantime, bypass your install and try a direct link:

https://community.mybb.com/mods.php

If that works, and you're still having problems, suspect something interfering - many not involving MyBB.  Also should mention, know from experience private IPs tend not to work.