421Misdirected Request
The request reached a server that is not configured to answer for the hostname you asked for.
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A connection-reuse problem. Modern clients reuse one connection for several hostnames that share a certificate, and if a server behind that connection does not serve one of those hostnames it answers 421 so the client opens a fresh connection instead.
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Status codes
69 of 69 codes. Click a row to copy it.
1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)