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Remote Desktop doesn't get blocked even though firewall says it is blocked

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Hi, I noticed a weird behavior with the firewall.  I noticed while testing Remote Desktop on a Windows 7 machine that the Mcafee Firewall did not need to be configured to allow port 3389 to pass on the pc to allow Remote Desktop.  It's weird because Mcafee has already created a rule in the ports section (see picture) that is available but not checked.  I would assume that means that it is blocked. 

I was able to successfully remote desktop into the pc within the local subnet or from the outside Internet. 

Is this a flaw or part of the design?

Thanks,

Jon

Los Angeles, CA

1 Solution

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Re: Remote Desktop doesn't get blocked even though firewall says it is blocked

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What I got back see if anything helps

He may have the connecting system in a Trusted subnet, or just the system itself has been trusted.

He may have changed the port that mstsc listens on (I’ve done this on my home systems, so it is possible), so that port may be enabled and the standard port isn’t.

He may have connected either inbound or outbound prior to this, so if you look in Internet Connections for Programs, he might have MSTSC/RDP in the FULL ACCESS mode.

He can test if it’s open by doing a port scan from an UNtrusted system, and/or telnet to 3389 (or whatever tcp port) i.e. “telnet 192.168.1.23 3389” from a cmd prompt.

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6 Replies
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Re: Remote Desktop doesn't get blocked even though firewall says it is blocked

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Interesting will ask.

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Re: Remote Desktop doesn't get blocked even though firewall says it is blocked

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Hi, Any update?

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Re: Remote Desktop doesn't get blocked even though firewall says it is blocked

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Sorry did ask but forgot to follow up here

Tech was going to reproduce the issue and report back but did not. I cahsed him up last call but I think he needs a reminder.

Email sent to him

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Re: Remote Desktop doesn't get blocked even though firewall says it is blocked

Jump to solution

What I got back see if anything helps

He may have the connecting system in a Trusted subnet, or just the system itself has been trusted.

He may have changed the port that mstsc listens on (I’ve done this on my home systems, so it is possible), so that port may be enabled and the standard port isn’t.

He may have connected either inbound or outbound prior to this, so if you look in Internet Connections for Programs, he might have MSTSC/RDP in the FULL ACCESS mode.

He can test if it’s open by doing a port scan from an UNtrusted system, and/or telnet to 3389 (or whatever tcp port) i.e. “telnet 192.168.1.23 3389” from a cmd prompt.

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Re: Remote Desktop doesn't get blocked even though firewall says it is blocked

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Thanks for all your help. I'm not sure if the behavior 'fixed' itself upon reboot but now the port is closed when accessed from outside.  I verified this by engaging/disengaging the MSTSC/RDP port and identifying whether I could connect or not.  I know when I tested this when I wrote the post that outside connections were flowing through the port even if the port was unchecked.  Well, main thing is it's working now.

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Re: Remote Desktop doesn't get blocked even though firewall says it is blocked

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So you tried what I posted or it fixed itself? If it is the latter mine was not the correct answer.

Glad to see it is working

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