“Unable to connect to server” is one of the error messages that often appears when we encounter connection problems – here’s what to do to fix it. If you have problems connecting to a website, one of the main error messages that we see appears on the screen of our PC, smartphone or tablet, which says Cannot connect to the server. This is a very general warning, and it is no coincidence that it may appear while we are using online software or services installed on our device. How to troubleshoot network connectivity problems?