You can't connect to a server?

[Cornelius]

You should also try the following steps:

@Rikku

• Check your firewall and make sure it doesn’t block TeamSpeak at all.
• Check your security software to make sure it doesn’t block any ports or protocols (some like to block UDP traffic which is essential for TeamSpeak)
• Check your router and search for any firewall, SPI Firewall, DDoS Protection, Flood Protection or similar and disable those option
• Occasionally it helped to disable “UDP Checksum Offload” for the network card. On Windows this can be found in the device manager, properties of the network adapter under the advanced tab.

If none of this helps, you could also check your logs to see if you are getting error messages, etc.