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Cannot connect to Server 2008 R2 RDS server

Posted on 2011-09-20
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Last Modified: 2013-11-21
Hi,

Got a problem with this server. It's a new install, Server 2008 R2 with RDS roles installed, along with DNS, DHCP and acting as a DC.

If I try to RD in from an XP machine I get:
An authentication error has occurred (Code: 0x80090330)
Remote computer: xxx.xxx.xxx.xxx

I can fix that by editing the default RDP file and adding in:
enablecredsspsupport:i:0

I suppose I got a few issues.
1) listed above
2) from a win7 computer I just get the username/password prompt then (cannot connect to the remote computer)
3) I'm just concerned that when I put the machines in onsite, their thinclients are going to have problems connecting too

This is my first RDS server, am I missing something obvious? I've got a certificate in there by the way.

This either happened after some updates or after I made it a DC. Was doing it all at once so I can't remember.

Any help would be great. Thanks
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Question by:Talds_Alouds
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by:AJS2011NZ
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The issue with XP is NLA. You can disable NLA on the RDP settings. Why is the RDS server a DC? This is not recommended best practice. Is it a trusted certificate or a self signed certificate? From the Win 7 workstation it will provide a reason as to why it failed to connect, can you post this?
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by:jimmernet
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try downloading the latest rdp client for xp from microsoft.

http://support.microsoft.com/kb/969084

cheers
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by:Talds_Alouds
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Thanks for your responses. Well, I updated the RDP client - surprised MS update didn't offer it.
I got the same problem but with a little more info:

An authentication error has occurred.
The specified data could not be decrypted.
Remote computer: xxx.xxx.xxx.xxx

In repsonse to AJS2011NZ:
Yeah I know it's not good practice but the client only has 5 seats and an RDS server is required by a piece of software they're running. It's a self signed cert. Where exactly do I disable NLA?
I've also just had a look in the event log for error information and I don't have anything. After I punch in the IP and hit connect, it asks for the user/pass. I type that in and all I get is the picture attached.

 RDP error
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by:jimmernet
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for what it's worth the link to the update page I gave you contains this...

Known issues affecting Windows XP package

    By default, Network Level Authentication (NLA) is disabled in Windows XP Service Pack 3 (SP3). To enable NLA, you have to turn on the Credential Security Service Provider (CredSSP). For more information, click the following article number to view the article in the Microsoft Knowledge Base:
    951608  Description of the Credential Security Service Provider (CredSSP) in Windows XP Service Pack 3
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by:Talds_Alouds
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Ok,
and the only way to do that is to type in the command in the default rdp connection?

So what are we thinking for the win7 machine?
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by:AJS2011NZ
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Hi, you can disable the require NLA on the RDS Server. You need to go to the RDP Connection options and take the check out. NLA Option
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by:Talds_Alouds
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Are you talking about TS 2003? I'm on server 2008R2.
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by:footech
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No, that option is not available on Server 2003.
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by:Talds_Alouds
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Can you please tell me how to get to it? Can't find it sorry.
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by:footech
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You can either dig down through Administrative Tools >  (can't remember the exact name here), or just right click on Computer in the Start Menu, choose Properties, then Remote Settings.
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by:Talds_Alouds
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Oh yeah I've checked all that. The window you posted was different looking to the one in remote settings. That's been on 'any version...' for a long time...
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by:footech
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The screenshot that AJS2011NZ posted is from Server 2008 R2.  Just a different way of looking at it (if you go to RD Session Host Configurator, then right click on the RDP-Tcp connection and choose properties).

If you're not able to connect from a Win 7 machine then something really wrong is happening.  Off the top of my head, either the service is not running, firewall is blocking the port, or you're trying to log in with a user that doesn't have permissions.
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by:footech
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Any progress here?  Were you able to disable NLA?  Are you able to connect now or still having issues?
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Talds_Alouds earned 0 total points
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Sorry, it was already NOT using NLA. I just rebuilt the box and all was ok. Don't know what the problem was - corrup certificate? I don't know but it's working now and that's the main thing.
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by:Talds_Alouds
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Accepting my own solution as I rebuilt.
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