RDS not connecting to the Host Session Server

I have a Remote Desktop Services "RemoteApp" setup that has been working for months, that is now, apparently, not able to resolve the Host Session server and connect to it.  I'm getting the "Your computer can't connect to the remote computer using the specified forward proxy configuration" error message.  So, it appears to me that the RemoteApp is getting thru the Remote Gateway Server, but is then having a problem completing the connection thru to the Host Session Server.  Nothing on the server has been touched (other than a loss of power at one point!?), and everything was working fine as recently as 4PM EST on 2/15/2018?  If anyone has had a similar experience with RDS, any help or advice would be greatly appreciated.
Jim KlocksinOwner, Data ArchitectsAsked:
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Britt ThompsonSr. Systems EngineerCommented:
If you have any kind of access to this machine you can try and recreate the RDP listener. In 2008 you can do this from the GUI and you can do it via the registry in 2008+

info from: http://kb.parallels.com/en/123673

Export the following registry key for safety:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp

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Delete the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp

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Download attached registry file:
RDP-Tcp.reg

NOTE: If your OS is Windows Server 2012 R2, additional file will be required:

RDP-Tcp2012.reg

Double-click the RDP-Tcp.reg file and click on Yes apply registry changes. Do the same with RDP-Tcp2012.reg if required.
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Britt ThompsonSr. Systems EngineerCommented:
If you had a power issue and this popped up immediately after I would suspect some settings on your firewall were not saved to memory and were erased during the outage. Confirm you have your NAT and firewall rules configured properly.

Can you RDP directly into the session host server using mstsc /admin?
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Jim KlocksinOwner, Data ArchitectsAuthor Commented:
Good point, but I can't RDP into the host session server because of this problem.  Since this is so critical to everything I do, I'm flying back to New Jersey today so I won't have computer access after around 10AM EST this morning and, at the moment, I know that I have no internet access back in New Jersey so I'm actually not going to be able to see any comments after 10AM EST today, essentially until I get this resolved.  BTW, since I know that I have no internet on my network in New Jersey, this indicates to me that my problem is more likely to be my server itself rather than how my RDP is set up (which hasn't changed since it was last working around 5PM on Thursday, 2/15...).
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Jim KlocksinOwner, Data ArchitectsAuthor Commented:
Unfortunately, right now I have no way to do what you mentioned in your last comment.  However, I should be back in New Jersey sometime before 6PM EST tonight and, at that point, I "should" have access to my server.  This is what I do know, 1) According to my internet provider my Comcast Business modem is working fine so I have to assume that if I connect either of my workstations or my server DIRECTLY to the cable modem I should have access to the internet and 2) I am able to ping my network (Gateway Server FQDN) with no problem, further indicating that the cable modem is providing access to the internet.  I will be in a much better position to respond to your comments once I'm on-site in New Jersey and have direct access to my computers there.  That said, I'm not crazy about leaving 80 degree weather for 30-40 degree weather, but you gotta do what you gotta do and this is my entire livelihood at stake here!  Again, I'll be in a much better position (and I truly believe, I'll be able to connect to the internet even if I have to bypass my SonicWALL firewall to do it, so I'll be able to communicate via EE despite the RDP issues that I'm currently having) to actually work on some of this later on today!  Thanks again for your input.
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Jim KlocksinOwner, Data ArchitectsAuthor Commented:
Now that I'm back in New Jersey and have direct access to my server and network, I'm realizing that the issue is NOT related to RDP at all, but rather a problem with my server and to some extent my workstation located here.  So I'm going to close out this question and ask another one that I've uncovered since returning back to my home office.
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Jim KlocksinOwner, Data ArchitectsAuthor Commented:
I do fully appreciate your taking the time to provide me with possible solutions to the problem that I believed existed on my network when I was at a remote location in Florida.  Upon my return to New Jersey, I now realize that I have even bigger problems that actually have nothing to do with Remote Desktop Services, but your time is valuable and I do want to acknowledge that.  Thanks, again!
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