I had a problem with my network recently…7 users cannot surf net overnight. The settings all remains unchanged. I’ve tried reformatting their PC and reinstall everything, but only 5 of them can resume to surf the net. I’ve also scan all the PC with the latest virusscan and no virus is found. My network’s 3 cisco router is covered by a watchguard connecting to another cisco router before going to Internet. I found out that the PC ping will always stop between the firewall and the router going to the Internet. What could have happen?
