I work in a building containing 4 offices, the building is a converted residential building so the offices are only as big as the average bedroom, we are all connected to the same broadband, and each office has its own connection box to allow for multiple computers to use the modem (there are 3 computers in 2 of the offices, 2 in 1 and 1 in the other).

I have had reoccurring issues with one computer in one of the offices, the error code above keeps appearing, and the computer won't send or receive email and this error code appears every time it tries to check for new emails.

I fixed it temporarily by changing my firewall settings, then it stopped again, the firewall settings were as they should have been so I then changed my security and port blocking settings on my norton security antivirus.

This also worked... for about 3 weeks, and now today, all 3 of the computers in that office are having the same issues.

I have changed the ports on WLM, double checked all server names/addresses. And have checked and unchecked pretty much every box in the options there are..

I am therefore assuming it connection box or modem issue, but the computers are still connected to internet.

AND the other computers work fine, internet and emails all as they should be.

Could someone please help! To say im frustrated about this is a massive understatement...