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Full Discussion: PING to AIX works but TELNET FTP SSH doesn't work
Operating Systems AIX PING to AIX works but TELNET FTP SSH doesn't work Post 303031696 by rbatte1 on Monday 4th of March 2019 12:23:05 PM
Old 03-04-2019
I would add:-
  • Possible router/firewall issues
  • Excessive server load (either CPU meaning it never fully connected or too much network traffic leaving it unable to respond)
  • DNS lookup failure, i.e. the DNS used by the server went off and the timeout was too long to allow the connection. The server will try to reverse lookup your connection for logging.
  • Client side issue perhaps?

It's all a bit vague so I can only be vague in suggestions.




Robin
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LEARN ABOUT CENTOS

unbound-streamtcp

unbound-streamtcp(1)						      unbound						      unbound-streamtcp(1)

NAME

       unbound-streamtcp - unbound DNS lookup utility

SYNOPSIS

       unbound-streamtcp [-unsh] [-f ipaddr[@port]] name type class

DESCRIPTION

       unbound-streamtcp sends a DNS Query of the given type and class for the given name to the DNS server over TCP and displays the response.

       If  the	server to query is not given using the -f option then localhost (127.0.0.1) is used. More queries can be given on one commandline,
       they are resolved in sequence.

       The available options are:

       name   This name is resolved (looked up in the DNS).

       type   Specify the type of data to lookup.

       class  Specify the class to lookup for.

       -u     Use UDP instead of TCP. No retries are attempted.

       -n     Do not wait for the answer.

       -s     Use SSL.

       -h     Print program usage.

       -f ipaddr[@port]
	      Specify the server to send the queries to. If not specified localhost (127.0.0.1) is used.

EXAMPLES

       Some examples of use.

       $ unbound-streamtcp www.example.com A IN

       $ unbound-streamtcp -f 192.168.1.1 www.example.com SOA IN

       $ unbound-streamtcp -f 192.168.1.1@1234 153.1.168.192.in-addr.arpa. PTR IN

EXIT CODE

       The unbound-streamtcp program exits with status code 1 on error, 0 on no error.

AUTHOR

       This manual page was written by Tomas Hozza <thozza@redhat.com>.

NLnet Labs							   Mar 21, 2013 					      unbound-streamtcp(1)
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