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What do I do about hacker attacks?

I have a Windows Server 2008 setup behind a firewall without any port forwards to the server. I do have an Untangle Internet Security Appliance with an OpenVPN connection setup for (2) remote users. The remote users run a 'RemoteApp' from the server but do not actually log onto the server with a Terminal Server session. I have installed monitoring software on the server. One of the daily checks is a 'Hacker' check, which has been reporting more than (100) unsuccessful login attempts within a (24) hour period. Should I be concerned about the failed logins? What should I do to stop the failed login attempts?
1 Solution
John MeggersNetwork ArchitectCommented:
Based on what you describe, it sounds like access to the server is only via the VPN, that there are no ports open on the FW allowing traffic to the server. If that's not the case, and there are ports open on the FW to allow access to the server, then it's entirely possible these are real attempts to access the server, in which case, you "authentication layer" appears to be working.   If that is the case, what are you seeing in the VPN logs?  I agree with you, I would be curious to understand where these unsuccessful logins are coming from.  Is it possible they're the result of some internal process trying to access the server?  
sahinmanAuthor Commented:
One of the laptops with VPN access to the network was infected with malware. I performed a format/reinstall and the hacker attacks have gone to zero!
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