In brief: I cannot Remote desktop a particular server – say "X" from "A" server, but with MSTSC /ADMIN switch I was able to RD "X" server. But the same "X" server can be RD'd from "B" server even without ADMIN Switch.

All servers are 2012 R2 DataCenter

I am getting this weird error – An internal error has occurred, while trying to MSTSC. I was trying to remote desktop to a server from one of our servers that has connectivity allowed. All required Ports are allowed and I was able to Remote desktop to that particular server using /admin switch but not with mstsc alone. I was able to RD to other servers fine, but not to this particular server. When I try to RD it, I am getting MSTSC crash in event viewer, I get credential page and then after entering credentials I see certificate warning and then post accepting that, it says establishing connection and after few seconds it says – An internal Error has occurred. 🙁

I see event viewer and found Event ID 1000 –

Below is the error log:

Faulting application name: mstsc.exe, version: 6.3.9600.16384, time stamp: 0x5215e2b5
Faulting module name: ntdll.dll, version: 6.3.9600.17278, time stamp: 0x53eebd22
Exception code: 0xc0000005
Fault offset: 0x00000000000326a0
Faulting process id: 0x1d78
Faulting application start time: 0x01d0236d841ae5c5
Faulting application path: C:\Windows\system32\mstsc.exe
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: ce466ba8-8f61-11e4-80f4-002dd8150a44
Faulting package full name:
Faulting package-relative application ID:

I am really worried, because I was able to RD this particular failing server from a different machine, but not from this particular server.

Any idea? Please help in this case. Let me know if further information is required.