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To troubleshoot communication problems between servers, it is better to ideally follow the TCP/IP stack:
Application Layer: are the services up and running on both servers? Are they correctly configured (eg. bind the correct IP and correct port)? Do application and system logs show meaningful errors?
Transport Layer: are the ports used by the application open (try telnet!)? Is it possible to ping the server?
Network Layer: is there a firewall on the network or on the OS correctly configured? Is the IP stack correctly configured (IP, routes, dns, etc.)? Are switches and routers working (check the ARP table!)?
Physical Layer: are the servers connected to a network? Are packets being lost?
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