Inconsistent results returned by live-status on IOS-XR (Netconf NED)

[Scott.ODonnell@gmail.com]

We are seeing an odd problem in lab testing.
We have a test topology of ASR9902, 8201 and N540.

The services code attempts to retrieve the PID of the device using live-status through the netconf NED.
In many cases, the value is returned correctly but randomly it triggers an error of "does not have sufficient capabilities"
I can't find anything on this here or general google searches.
I'm looking for any direction on how to troubleshoot this.

The issue only seems to happen with the ASR9902. The other IOS-XR devices have no issue

Update:
It seems the live-status request works the first time it's called but not after that.
I'm wondering if there is threshold to the live-status requests or a concurrency problem.

[cohult · Accepted solution]

Check your port configuration for the device. We have seen XR devices sending a <hello> without capabilities when connecting to the device using SSH port 22 instead of the NETCONF SSH port 830.

[Scott.ODonnell@gmail.com]

Cohult - Amazing and thank you!
This was the problem.