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How to check any IP blocked?

My VM is a testing web server, which enabled firewall port for http and https.

On Azure, the http and https port are also added to inbound rules.

The VM installed a web API program to send message to client (A) and client program reply message as XML format.

When the client A program try to reply the server program. The error message "The underlying connection was closed: An unexpected error occurred on a send." shown on.

I tried to install the client program to other machine (B), it can reply message without error.

The VM turned on the firewall logging. It is no any dropped packet. IIS log cannot found client (A) IP reply.

Is it client (A) IP socket blocked by Azure Network device?


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