Very occasionally and randomly (last happened yesterday, then the time prior ~3 weeks earlier, and then it was a couple of days before that)
Whilst trying to access the company's website (which is hosted offsite), we will be unable to access the site with just the word "Error" in the top left corner of the page.
-Can telnet to the site's IP address no problem
-Can ping the sites DNS name ok
However this is isolated only to this site, if we connect to the website from a mobile device connected to 3G or connect from another computer offsite the website can be accessed no problem.
This will only remain for about 5 minutes before everything starts working normally again.
This office has a student lab with about 20PCs (which on the last incident none were being used and most were not even turned on) and my concern is that there could be some sort of attempted security breach on the network.
I don't know if this is way off track, but I was wondering what could be the next step to isolate this down further?