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Telnet from linux shell to GSM module has no response message

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Last Modified: 2012-07-20
Hello Expert,

I have GSM module connected to my local network. When I telnet using putty, Every command I send to modem is ok that I issued AT command "atz" and GSM modules response "OK" back to me. please see below

===================
Using putty connect to 192.168.1.111 port 11111
===================
atz
atz

OK
atz
atz

OK
atz
atz

OK
===================


The problem is when I login to my linux server on the same local network and telnet to GSM modules, I can send AT Command but no response message back to me please see below


===================
shell>telnet 192.168.1.111 port 11111
===================
shell> telnet 192.168.1.111 11111

atz
atz




atz
atz


atz
atz
atz
atz




atz
atz


===================

Please help to investigate. Thank you.
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