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Full Discussion: Telnet connection closes before i execute GET command
Top Forums Shell Programming and Scripting Telnet connection closes before i execute GET command Post 303020520 by mohtashims on Sunday 22nd of July 2018 01:19:48 AM
Old 07-22-2018
Tools Telnet connection closes before i execute GET command
I tried the below steps for telnet command from a remote server:

1. telnet myservice.com 443
2. GET / HTTP/1.0
3. Press enter key twice

Please see the output below:
Code:
   bash-3.2$ hostname 
 remoteserver1 
  bash-3.2$ telnet myservice.com 443 
 Trying 191.172.172.133... 
 Connected to myservice.com. 
 Escape character is '^]'. 
 GET / HTTP/1.0 
 HTTP/1.1 302 Moved Temporarily 
 Server: Oracle-iPlanet-Web-Server/7.0 
 Date: Tue, 17 Jul 2018 14:04:20 GMT 
 Location: https://myservice.com:443/ 
 Content-length: 0 
  Connection to myservice.com closed by foreign host.

But, when I try the telnet command locally [from the same server where https://myservice.com:443/ service is running] it closes the connection even before I could get the response output of the GET command as shown below:
Code:
   bash-3.2$ hostname 
 localserver1 
  bash-3.2$ telnet myservice.com 443 
 Trying 191.172.172.133... 
 Connected to myservice.com. 
 Escape character is '^]'. 
 GET / HTTP/1.0 
  Connection to myservice.com closed by foreign host.

So, like you can see above the connection gets closed even before the GET command could return any output.

Please share a fix so that I can fire the GET command before the telnet connection closes.
Last edited by mohtashims; 07-22-2018 at 04:34 AM..
 

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LEARN ABOUT OPENSOLARIS

mconnect

mconnect(1)							   User Commands						       mconnect(1)

NAME

       mconnect - connect to SMTP mail server socket

SYNOPSIS

       mconnect [-p port] [-r] [hostname]

DESCRIPTION

       The  mconnect utility opens a connection to the mail server on a given host, so that it can be tested independently of all other mail soft-
       ware. If no host is given, the connection is made to the local host. Servers expect to speak the Simple Mail Transfer  Protocol	(SMTP)	on
       this connection. Exit by typing the quit command. Typing EOF sends an end of file to the server. An interrupt closes the connection immedi-
       ately and exits.

OPTIONS

       The following options are supported:

       -pport	 Specify the port number instead of the default SMTP port (number 25) as the next argument.

       -r	 Raw mode: disable the default line buffering and input handling. This produces an effect similar to  telnet(1) to port number 25.

OPERANDS

       The following operand is supported:

       hostname    The name of a given host.

USAGE

       The mconnect command is IPv6-enabled. See ip6(7P).

FILES

       /etc/mail/sendmail.hf	Help file for SMTP commands

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsndmu 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       telnet(1), sendmail(1M), attributes(5), ip6(7P)

       Postel, Jonathan B., RFC 821, Simple Mail Transfer Protocol,  Information Sciences Institute, University  of  Southern  California,  August
       1982.

SunOS 5.11							    28 Jan 2008 						       mconnect(1)
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