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Old 05-10-2017, 07:28 AM   #1
shubha_nand
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Connection closed by foreign host


Hi All,

Iam trying to telnet an database server from Linux machine, it shows connected after few seconds a message is displayed "connection closed by foreign host". Iam connecting through root user.

Could you please is telnet connecting to the database server? what does this message mean? and how to resolve it?
------------

telnet ORA.XXX.COM 1526
trying <IP Address>
connected to ORA.XXX.COM.
escape Character is ']'
Connection closed by foreign host


Thanks,
shubha
 
Old 05-10-2017, 07:32 AM   #2
pan64
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most probably the server waits for something.
Telnet connected to that given host/port successfully, but did not send any information over the line. That's why the foreign host closed the connection.
 
Old 05-10-2017, 07:37 AM   #3
shubha_nand
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Thank you for the information.
So, can we ignore this message? Or can we resolve if it is a issue?
Basically, if telnet is working fine then we need to write a script to telnet other servers and ports, so please let us know if we can go ahead even with this connection closed by foreign host message?

Thanks.
 
Old 05-10-2017, 07:37 AM   #4
TB0ne
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Quote:
Originally Posted by shubha_nand View Post
Hi All,

Iam trying to telnet an database server from Linux machine, it shows connected after few seconds a message is displayed "connection closed by foreign host". Iam connecting through root user.

Could you please is telnet connecting to the database server? what does this message mean? and how to resolve it?
------------

telnet ORA.XXX.COM 1526
trying <IP Address>
connected to ORA.XXX.COM.
escape Character is ']'
Connection closed by foreign host
And aside from what pan64 said...you are connecting to a server over a network, as ROOT...over TELNET???? That is possibly the most insecure thing I've heard about in many years. Telnet should NEVER be used, and logging in as root anywhere except the console should never be done. There is simply no reason for either...SSH should be used, and logging in as your 'regular' user should be fine.

And if you're using telnet just to TEST connectivity to a DB listener, it's not going to give you much more than a "yes you connected" type message like you got.
 
Old 05-10-2017, 07:42 AM   #5
pan64
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Quote:
Originally Posted by shubha_nand View Post
Thank you for the information.
So, can we ignore this message? Or can we resolve if it is a issue?
Basically, if telnet is working fine then we need to write a script to telnet other servers and ports, so please let us know if we can go ahead even with this connection closed by foreign host message?

Thanks.
I have no idea what do you want to achieve at all, so I cannot tell you what can you ignore or you how can go further.
As it was already stated using root account and telnet are not really suggested.
 
Old 05-10-2017, 07:43 AM   #6
shubha_nand
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I tried with user account as well, I get the same message after few seconds.

Thanks.
 
Old 05-10-2017, 07:45 AM   #7
pan64
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yes, obviously it does not depend on that user id.
 
Old 05-10-2017, 07:52 AM   #8
michaelk
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You can not connect to the database server using telnet. telnet uses ASCII and as far as I know Oracle uses a binary protocol. All you can tell from telnet is that some service is running on port 1526.

What are you actually trying to accomplish?

Last edited by michaelk; 05-10-2017 at 08:00 AM.
 
  


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