Remote desktop access denied

Server 2008R2 RDS.  When outside clients try to get remote access the get "access Denied"  even the administrators account.  When Server is Rebooted all users can get remote session and issue is resolved until next morning and then same issue appears.
BUCKBERGAsked:
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
Are there any critical, warning or errors in the event log relevant?

Is this issue reflected on the lan and wan before rebooting resolves it?
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Henrik JohanssonSystems engineerCommented:
We've seen this behavior when a RDSH is overloaded.
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Windows Server 2008

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