There has never been any support in RESTCONF for explicitly setting "nc:operation". I just tried supplying "_xmlns:nc" and "_nc:operation" on a 5.2 release and it doesnot work, I get an HTTP 400 error.

Note that for JSON it should be module name which is used as prefix,not the prefix defined in the YANG model. This means, for "_xmlns:nc"to be a valid node identifier, a module named _xmlns.yang is required.

Naming a node "_xmlns:nc" is not a valid node identifier, if there isn't aprefix defined as "_xmlns" somewhere. Analogous for "_nc:operation".See RFC 7950 Section 14 YANG ABNF Grammar, e.g.: node-identifier = [prefix ":"] identifier It is hard to tel...

Hi! Is the response just cut and the connection closed or is theremissing content? How many devices are in the list? What version of NSO are you using? EDIT: Have you tried the RESTCONF Query API? It might have better performance.

You need to report this as a bug using the usual channels for that.