Can't establish RDP-Connection; 2 CALs available? 2008R2 RDS

Hi,
i encountered a suspect problem.
We have a Windows Server 2008R2 with installed RDS-Role. For many years, we used a 5-User-CAL - no problems.
No we got some new Users (8 in total), so we bought a separate 5-User-RDS-Cal (2012 R2, downgraded it to 2008 by phone).
Actual, we have the problem, that only 6 Users can connect via RDP to the server. If the 7. tries to connect, the RDP-Connection can't be established; error (translated from german): "This computer cannot establish a connection to the remote computer".
If i kick a user from the server, i can immediatly connect from my workstation.
The RDS-Licensemanager is installed on the same system; it show's 2x5 CALs (correctly installed). If i run a report, it says:8 from 10 total licenses used - so we should have 2 free.
Here's a screenshot from the report: ddlw.org/img/h5mrh1qv.jpg (sorry, can't insert pictures at this moment)
The Best-practice-analyzer for RDS show's up no error, even in the the eventlog there are no RDS-relevant Errors/Warnings/Informations.
Both CALs are definitly RDS-USER-Cals, and the RDS-Host is setup for User-Cals.
Maybe, someone has a solution for our problem?

Hi,
On the server, please log on as an admin and open RD Session Host Configuration (tsconfig.msc). Next double-click on RDP-Tcp. On the Network Adapter tab, please make sure Unlimited Connections is selected.
After making the above change please test to see if you are able to have all users log on at the same time.
Thanks.
-TP

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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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Copyright (c) 1991, 2005, Oracle. All rights reserved.
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TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 18-KAS-2
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Copyright (c) 1997, 2005, Oracle. All rights reserved.
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Reply from 169.254.121.46: bytes=32 time<1ms TTL=128
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TNS-12502: TNS:listener received no CONNECT_DATA from client
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TNS-12502: TNS:listener received no CONNECT_DATA from client
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TNS-12502: TNS:listener received no CONNECT_DATA from client
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TNS-12502: TNS:listener received no CONNECT_DATA from client
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TNS-12502: TNS:listener received no CONNECT_DATA from client

After a seach when I click on one of the resulting links I get : Unable to connect -Firefox can't establish a connection

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Did this fix your problems? Please report back to us!
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Firefox can't establish a connection to the server at localhost

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