Hey Geralt, sorry to see you're having problems just did a quick check and the server seems to be up and open to connections, so I can only assume at this point its on your side so lets go through some trouble shooting steps.
First thing I always suggest is make sure you have patched correctly so when you open your client below in the left hand side of the client should be your current client version, it should say "Version 5.4.8 (184140)"
<IMG src="http://i.imgur.com/2AgwttH.png"><s>[img]</s>[url="http://i.imgur.com/2AgwttH.png">http://i.imgur.com/2AgwttH.png[/url]<e>[/img]</e></IMG>
If it turns out you're not properly patched, re-read the installation steps because you may have mis-read or missed an important step.
If you are still having problems connecting but your client is properly patched, in a spoiler or a pastebin, copy what's inside your config file and post it in a reply so we can take a look.
First thing I always suggest is make sure you have patched correctly so when you open your client below in the left hand side of the client should be your current client version, it should say "Version 5.4.8 (184140)"
<IMG src="http://i.imgur.com/2AgwttH.png"><s>[img]</s>[url="http://i.imgur.com/2AgwttH.png">http://i.imgur.com/2AgwttH.png[/url]<e>[/img]</e></IMG>
If it turns out you're not properly patched, re-read the installation steps because you may have mis-read or missed an important step.
If you are still having problems connecting but your client is properly patched, in a spoiler or a pastebin, copy what's inside your config file and post it in a reply so we can take a look.