Kicked for no secure connection to VAC servers

Hey everyone,

I was playing on a server, building, etc. And then I got randomly kicked, the message said “A secure connection to VAC was unable to be made” or something by those lines.
I haven’t been using any third-party programs, nor any cheats either. Why did this happen to me?

Check this out: Secure connection failed, No Steam logon, or A connection to the VAC servers could not be made

If it was because you used cheat and it was detected, you wouldn’t get this message.