There are several causes that can cause this particular problem ranging from the third party antivirus programs installed on your computer, firewall port issues or server connection problem.

Microsoft has hardened authentication for its DCOM Server in response to a vulnerability. Check for the impact on your network now before the change becomes permanent. Microsoft’s June security ...

A firewall is merely the first ... Also, note that if your only connection to the internet is through a proxy server or NAT, this test will not work as expected for you. Instead, the proxy ...