There are different cases when you are not able to connect to the server due to DNS issues. You will find all the necessary instructions how to check your DNS settings if you click on the operating system below.
If the option "Obtain DNS server address automatically" is checked you should change it to "Use the following DNS server addresses" and enter 126.96.36.199 and 188.8.131.52. If you have these parameters set to some different values (not automatically), try setting the "Obtain DNS server address automatically" first.
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