2012 RDS The two computers couldn't connect in the amount of time allotted

I have a loan 2012 server acting as a session host.

The server allows 1 user to connect, but for each subsequent user the connection hangs on "Configuring remote session" and eventually fails with "The two computers couldn't connect in the amount of time allotted"

When the logged in user logs out, another user can log in, but only 1 at a time.
This happens regardless of the source of the connection. The server has no firewall or AV installed presently.

The event log shows the connection is established but its as if the server does nothing with it afterwards.

Any ideas?
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PerimeterITAsked:
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Robin CMSenior Security and Infrastructure EngineerCommented:
Presumably you're up to date with all hotfixes, the big April Update etc.?
Can you log on to the console after the first RDP session has been established or does that hang too?
Does it work if you log on as an administrator as the second user?
Have you tried reseting user profiles?
You could try running Process Monitor in the first session (or on the console) and then watching what happens when the second logon gets processed.
Do look at all the RDS event logs as well as the system and application logs for suspect warnings and errors.
Are you connecting direct to the RDSH server or going via a connection broker?
What CPU and memory usage is the server showing before and during the second logon?
Check your Remote Desktop Licensing too - make sure it is working, can be contacted by the RDSH server, and that you have licences available.
Do you have NLA enabled for RDP connections, can you try disabling it? (Untick the box that says "allow connections only from computers running remote desktop with Network Level Authentication (recommended)".

Lots of stuff to try but we need to try and narrow the cause down and/or rule things out.
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PerimeterITAuthor Commented:
Presumably you're up to date with all hotfixes, the big April Update etc.?
The latest cycle of hotfixes won't install due to a random error.

Can you log on to the console after the first RDP session has been established or does that hang too?
The console works fine throughout

Does it work if you log on as an administrator as the second user?
No

Have you tried reseting user profiles?
Yes, no joy

You could try running Process Monitor in the first session (or on the console) and then watching what happens when the second logon gets processed.
Nothing seems to happen, it's like the TS services aren't functioning

Do look at all the RDS event logs as well as the system and application logs for suspect warnings and errors.
I see a log for the initial connection, but then nothing happens.

Are you connecting direct to the RDSH server or going via a connection broker?
Both, same result

What CPU and memory usage is the server showing before and during the second logon?
Negligible

Check your Remote Desktop Licensing too - make sure it is working, can be contacted by the RDSH server, and that you have licences available.
Licensing is working fine, I see 48 available user CALs

Do you have NLA enabled for RDP connections, can you try disabling it?
It's been off throughout the process



Looks like either the system files are wounded or the box has malware.

Time for an sfc /scannow and a full AV scan...
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PerimeterITAuthor Commented:
Turns out it was a group policy that was enforcing only 1 user can login at a time.
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PerimeterITAuthor Commented:
Found fix myself
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Windows Server 2012

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