Yesterday we had access to our server. There are two computer that are hard wired to the router/modem. We have internet connections and HAD server connections last night. We came in the morning and neither one of the computers that are mapped to the info on the server has access to server now. Its saying we are not connected. Then I got an error saying that the system detected a possible attempt to compromise security. We are a tax firm and HAVE GO TO ACCESS OUR SERVER! HELP

Try rebooting everything (server, computers, router, switches). The "possible attempt to compromise security" does not sound like a real Windows error message. Sounds more like Malware that tries to get you to install/buy more crap. Try running ad-aware/spybot/malwarebytes etc. -Ryan Adams Free Computer Tips and more:http://RyanTAdams.com Paid Tech Support: Black Diamond

Hopefully, as a tax service, which contains all the information needed to do identity theft, you have a paid professional configuring and monitoring your firewall router. What server OS are you running? Can you logon to the server? A one sentence question will result in a one sentence answer.

He said he was taking care of everything. He works for ATT and does this on the side. I have never heard him say anything about firewall router. How do we get this? Yes, I can log into the server and we are using windows 2000 server

Please describe as best you can what connects to what. For example do you see a router and modem or is it a combo unit or just a modem? How many lan ports on this router? Is the server and two pcs connected to it? Do you get internet to the server? Where did you get the security popup saying there may be a security issue? Can the pcs ping the server? Each other? A one sentence question will result in a one sentence answer.

Thank you for your help during all of this. I finally got the system to work. We had to re-map the network then finally we figured out the password and were able to get all the computers working. Thank you again!

BTW just because this person works for AT&T [telephony] does not mean they know about firewalls and how to configure them. You have a huge liability as well as being put out of business if your server gets hacked and that tax info leaves the premises. A one sentence question will result in a one sentence answer.