If you recently performed maintenance on your Microsoft Lync servers, including patching, Lync may experience an error that the server cannot validate the certificate.   Can’t Sign in to Lync   The server cannot validate the certificate. Please try again later. If the problem continues, contact your support team.  

Identd is a service that sends a username in plain text across port 113 when requested. You specify a text name in the application (typically a username) and run the service. The original purpose of identD was to “validate” a user was who they are saying they are when they cross over the Internet. In the...

In Mac OS X 10.11 El Captain, GateKeeper protection feature is enabled by default. This feature blocks any application that is not signed by the App Store or verified Mac Developers. This is verified through a unique certificate every application comes bundled with (or should come bundled with). The fact is, there are a ton of Mac...

File Transfer Protocol (FTP) is a popular Transmission Control Protocol (TCP) that allows users to transfer files between hosts and or servers. It’s extremely fast, reliable, and straightforward. Anyone with a PC can quickly setup free FTP software to use. To use FTP, you need at least 2 PC’s – one acting as a host and...

If you are trying to run a bottled Mac X application that requires X11, you may receive the following error message upon launching it. This error is most common if you are running Mac X 10.11 El Captain:   The application X11 could not be opened.   An error occurred while starting the X11 server: “Failed to...