11-06-2018
ping uses the ICMP protocol. It uses no ports. It does not need tcp or ssh.
ping can be blocked, but you gave us no system information.
See this for how ping can be blocked -
How to Block Ping ICMP Requests to Linux Systems
Good, complete questions get better answers - we need the UNIX OS and version to give specific help.
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A similar error arising for me , please find the debug logs.
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KFAFH_DR: protocol failure due to unexpected closure from server end
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Escape character is '^]'.
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