Failed to resolve hostname

I have installed TS3 and when I try to connect to the server I get:

Failed to resolve hostname hatsu.pl

The server name is Hatsu.pl:9990

I did reset DNS via cmd then added TS3 to windows defender as allowed. I don't have any other firewall or anything.

Here is log:

2015-08-30 13:19:46 Info TeamSpeak 3 Client 3.0.17 (2015-08-04 07:38:33)
2015-08-30 13:19:46 Info SystemInformation: Windows 7 SP1 (7601) x64 (AMD or Intel) Binary: 64bit
2015-08-30 13:19:46 Info Using hardware aes
2015-08-30 13:19:46 Direct Sound Debug setting timer resolution to 1ms
2015-08-30 13:19:46 Info Loading plugin: clientquery_plugin
2015-08-30 13:19:46 Info Loading plugin: lua_plugin
2015-08-30 13:19:46 Info Loading plugin: teamspeak_control_plugin
2015-08-30 13:19:46 Info Loading plugin: test_plugin
2015-08-30 13:19:46 Info Loading plugin: ts3g15
2015-08-30 13:19:46 Query Info listening on XXXXXXXXXX
2015-08-30 13:19:46 Windows Audio Session Devel DeviceDeleteList::waitForDeletes - enter
2015-08-30 13:19:46 Windows Audio Session Devel DeviceDeleteList::waitForDeletes - leave
2015-08-30 13:19:46 Info *** Time [SERVERVIEWMANAGER]: 206
2015-08-30 13:19:47 Input Info Default monitoring enabled
2015-08-30 13:19:47 Info *** Time [MAINWINDOW]: 577
2015-08-30 13:19:47 Info *** Time [INIT]: 578
2015-08-30 13:19:47 ClientUI Info Qt version: 5.4.1
2015-08-30 13:19:47 ClientUI Info Using configuration location: C:\Users\Przemo\AppData\Roaming\TS3Client\settings .db
2015-08-30 13:19:47 ClientUI Info Last update check was: N sie 30 15:17:29 2015
2015-08-30 13:19:47 ClientUI Info Checking for update
2015-08-30 13:19:47 Update Info Checking for updates...
2015-08-30 13:19:48 Newsticker Info Newsticker language change detected
2015-08-30 13:19:48 Newsticker Info Newsticker next check:
2015-08-30 13:19:48 Info Statistics report: Not yet, next report on So wrz 12 14:43:16 2015
2015-08-30 13:19:48 Newsticker Info Newsticker not found for language pl
2015-08-30 13:19:48 Newsticker Info Newsticker not found for language en
2015-08-30 13:22:31 ClientUI Info Connect to server: Hatsu.pl
2015-08-30 13:22:31 ClientUI Info Trying to resolve Hatsu.pl
2015-08-30 13:22:31 TSDNS Info DNS resolve unsuccessful for "hatsu.pl"
2015-08-30 13:22:31 TSDNS Info SRV DNS resolve unsuccessful for "_ts3._udp.hatsu.pl"
2015-08-30 13:22:31 TSDNS Info No SRV TSDNS found at "_tsdns._tcp.hatsu.pl"
2015-08-30 13:22:31 TSDNS Info No TSDNS found at "hatsu.pl"
2015-08-30 13:22:31 ClientUI Info Lookup finished: 9990 0 2
2015-08-30 13:22:31 ClientUI Info Failed to resolve Hatsu.pl

Failed to resolve hostname