You can probably not establish a connection because the connection details have been entered incorrectly in your software.  The most common error is an incorrectly entered password.  The best way to enter the password is by keying it manually because hidden characters and spaces are often copied along with the password when using copy and paste.  Do not use spaces, and be careful with uppercase letters.  The password is case-sensitive.

Do you have sufficient credit on your account?  You can check this in My Eweka.

Sometimes it helps to briefly close the newsreader after updating the configuration and restart the application.

Perhaps the DNS server of your Internet provider is temporarily not working correctly.  Check whether the DNS server settings on your computer are correct and match the details of your Internet provider.  In order to correct the DNS problem, you can enter the IP address of the server in the server address line.  See the Service Status for the correct IP address.

NOTE:  The IP address of a server can change over the course of time.  This can potentially cause you to experience problems.

You may need to delete and reinstall the newsreader.