Remoteapp rdweb connection problem

I've published some apps with RemoteApp from my 2012 R2 RDS server. I don't have a Gateway server installed. I have a number of Windows 7 desktops which I'm connecting from, using IE9, IE10, IE11. When I use web access by going to
<RDS Server IP>/rdweb from some of the PCs and launch a RemoteApp application it works fine. However, from a number of my other desktops I get an error popup "RemoteApp Disconnected. The remote computer could not be found." At
first I thought it might be IE version, but I have two different IE9 desktops and one works and the other doesn't. Same for IE 10. I know that IE11 has some problems with rdweb. I have compared the different desktops and can't find a reason
why some are working and some are not. I've checked firewall settings, IE settings, DNS entries, AD Computer objects, network settings and as far as I can determine the machines are configured identically. Cleared the IE caches on both. Logging
in with the same user. I'm at my wits end why some of these machines (which are all identical Dell 745s) will not connect. All the postings I've seen about this error have said it is caused by bad Gateway server configurations, but I'm
not using a Gateway server, and that doesn't explain why some of my machines work fine. Any help in troubleshooting this would be appreciated.

Hi,
1. On the problem PCs, when you click to launch a RemoteApp there should be a prompt with a name listed for Remote computer. Are you able to ping this name from the problem computers? Is the same ip address being returned as on the working
PCs?
2. Are you able to open Remote Desktop Connection from a problem PC and connect to the name that shows on the prompt?
3. Does the prompt show Gateway server with a name next to it? Based on what you have said Gateway server should
not show up in the prompt when launching a RemoteApp.
4. Please verify that mstsc.exe version 6.3.9600 is on the client PCs. 6.3.9600 is the RDP 8.1 Client which is what you should be using with Server 2012 R2.
5. If you have any third-party security/antivirus/antimalware/etc. installed on the problem PCs please try completely
uninstalling it on one of them and them test again to see if the problem still exists.
6. On the problem PCs please make sure they have the same subnet mask, default gateway, dns servers, etc. as the PCs that are working. From what you have written I believe you have already checked this but I wanted to mention it because I have seen
people check a ton of stuff and then realize the PC was on a different subnet or other basic networking issue.
7. On the server, please check the incoming Remote Desktop rules in Windows Firewall with Advanced Security (wf.msc) to make sure their Scope is set to Any remote ip address.
IE 9/10/11 works fine with 2012 RD Web.
Thanks.
-TP

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