1. IETF RFC 6241: Network Configuration Protocol (NETCONF). June 2011.
Section 8.6, : "The is the session ID of the NETCONF session to be terminated. The session ID MUST NOT be the current session. If the is the current session, the server MUST send an with an of 'invalid-value' and an of 'session-id'." (Page 69)
DOI: https://doi.org/10.17487/RFC6241
2. Cisco IOS XE Programmability Configuration Guide, Cisco IOS XE 17.6: NETCONF Protocol.
Chapter: NETCONF Protocol, Section: NETCONF Protocol Operations, Subsection: : This section describes the operation and its parameters, adhering to the behavior specified in RFC 6241. It confirms that attempting to kill the current session results in an error. (The specific page varies by document version, but the content is consistent in the relevant section).