topic Re: Unable to launch application when terminal server agent is installed in General Topics

Unable to launch application when terminal server agent is installed

kegeorge — Thu, 22 Dec 2022 00:59:18 GMT

We recently installed the terminal server agent onto our Citrix environment. As soon as I installed it, we had reports that users were unable to launch our VoIP software called Avaya One-X Communicator. It crashes immediately after launching it. As soon as I disable the PAN Terminal Server Agent service users are able to launch it without issue.

The debug log does show port allocation fails for the application; however, I've tried other ranges and settings and am not able to solve this. I've also tried a different listening port even though Avaya does not use the default 5009. I've also opened a support case but they have been less than helpful.

12/21/22 15:45:32[Info 1001]: Port allocation fails for port 20012: process onexcui.exe session 1 count 2. NTSTATUS: 0xC0000043
12/21/22 15:45:32[Info 1001]: Port allocation fails for port 20012: process onexcui.exe session 1 count 2. NTSTATUS: 0xC0000043
12/21/22 15:45:32[Info 1001]: Port allocation fails for port 20014: process onexcui.exe session 1 count 4. NTSTATUS: 0xC0000043
12/21/22 15:45:32[Info 1001]: Port allocation fails for port 20014: process onexcui.exe session 1 count 4. NTSTATUS: 0xC0000043

Any ideas?

Thank you

Re: Unable to launch application when terminal server agent is installed

JayGolf — Wed, 28 Dec 2022 03:41:31 GMT

Hi @kegeorge ,

Have you had any luck with support from this?

Re: Unable to launch application when terminal server agent is installed

kegeorge — Thu, 29 Dec 2022 01:41:05 GMT

After some pushback that it is indeed an issue with the agent they recommended this KB article: Terminal Services Agent 7.0.7 Changes on User Apps requesting S... - Knowledge Base - Palo Alto Networks.

Setting Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Palo Alto Networks\TS Agent\Adv\HonorSrcPortRequest to "1" resolved our issue and the application now launches without issue.

1: Honor application-specified source port requests only if the port is not within the source port allocation range for the interactive user sessions

Re: Unable to launch application when terminal server agent is installed

PTCLtd — Wed, 21 May 2025 11:00:14 GMT

Perfect, thank you. Worked for me as well. For us it basically did not work whenever an app would comunicate in both directions because PAN agent would block the inbound listening port. The registry edit did the trick.