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aa24b77d8b
The root cause is the fix for CVE-2024-0760 (part 3), which resets the TCP connection on a failed send. Specifically commit 4b7c61381f186e20a476c35032a871295ebbd385 stops reading on the socket because the TCP connection is throttling. When the tcpdns_send_cb callback thinks about restarting reading on the socket, this fails because the socket is a client socket. And nsupdate is a client and is using the same netmgr code. This commit removes the requirement that the socket must be a server socket, allowing reading on the socket again after being throttled.