> # iSNS Client Registration and Deregistration

> An iSNS client cannot query the iSNS server until it has registered. iSNS client deregistration can occur either explicitly or when the iSNS server detects that it can no longer reach the client (through ESI monitoring).

> iSNS client registration and deregistration result in status change notifications (SCNs) being generated to all interested iSNS clients.

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