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We are working on restoring the download link to the NSO trial version, The trial version was for some reason removed from software.cisco.com so that's why the link no longer works.
I believe you got good news to your original question in back in 2022:https://community.cisco.com/t5/nso-developer-hub-discussions/how-to-check-if-it-is-a-dry-run-in-python-for-a-service/m-p/4550700/highlight/true#M6825
This is one of the most tested/used functionalities in ConfD (hence NSO too). So it would be surprising if this is an NSO issue. But you never know. Check that you reply with ITER_RECURSE for parent lists/containers (not ITER_CONTINUE etc.)Subscriber...
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.
