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So, I am using telnet to connect to a host and port. But right after I connect the host closes the connection. So, I get the hand-shake of
[SYN]
[SYN,ACK]
[ACK]
Then, I get:
[FIN,ACK]
My question is what is the diagnosis of this type of connection problem?
I am not sure if it connection refused because of the initial hand-shake.
Connection refused? Firewall? Another type of error?
It means the server has closed the connection, which could be for a large number of reasons, including normal operation.