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Terminal Services Security

Posted on 2012-03-12
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Last Modified: 2012-03-26
I have a remote web server that I access using Terminal Services.  I noticed (in the event log) that someone is attempting to access the machine.  There are numerous "invalid logon" attempts (every second).

This is a W2008 server.  What is the best way to secure this?   Is there a way to automatically block an IP that has repeated bad logons?

I need to be able to access this server from any location.  Is there a certificate method?
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Question by:No1Coder
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8 Comments
 
LVL 40

Expert Comment

by:als315
ID: 37710971
You can use certificate for authentification:
http://blogs.msdn.com/b/rds/archive/2010/04/09/configuring-remote-desktop-certificates.aspx
IP blocking is function of firewall, it is not possible in RDP settings.
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Author Comment

by:No1Coder
ID: 37711940
If I setup the certificate, does that require something extra on the client computers I will be using?
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LVL 40

Expert Comment

by:als315
ID: 37713128
You should install certificate on client:
http://www.petri.co.il/securing_rdp_communications.htm
May be this article will be interesting to you:
http://www.petri.co.il/securing-rdp-remote-desktop-and-terminal-server-connections.htm
This parameter was new for me:
Set an account lockout policy - There are tools that will use brute-force to guess passwords and log-on remotely. You cannot totally stop this, but you can minimized it by setting an account lockout policy. If someone tries to guess the password, then after a few guesses they will be locked out for a period of time.
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Author Comment

by:No1Coder
ID: 37729165
I setup account lockout policies but they don't seem to work for terminal service connections.  I am still seeing numerous invalid logon attempts every few seconds.  If the lockout was working, I would think it would lock the attemp out for 30 minutes.

These articles are fairly complex.  Event the wizards are pretty complex.  I'm afraid will will lock myself out, or lock out customer access to teh web sites.

I just want to be sure that terminal services connections are from me, although it can be fro multiple machines.

What is the best approach.
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LVL 40

Expert Comment

by:als315
ID: 37729290
As I've stated before - for successfull filtering of attacks you need firewall.
You can try to use internal server 2008 firewall, but usually some external (hardware or software) is used.
Here are some basics:
http://www.windowsnetworking.com/articles_tutorials/configure-Windows-Server-2008-advanced-firewall-MMC-snap-in.html
You can block individual Ips:
http://tech.avivo.si/2011/04/how-to-block-remote-ip-address-hacker-attack-on-windows-2008-server/
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LVL 40

Expert Comment

by:als315
ID: 37734290
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Author Comment

by:No1Coder
ID: 37746584
I don;t think IP filtering will work.  The attacks seem to be coming from more tahn one IP address.

Would a VPN connection be more secure?  I could establish a VPN, and then do terminal services.  I would not have to open the port (3389) publically.
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als315 earned 1000 total points
ID: 37746694
Good idea. This is usual setup.
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