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I am unable to telnet a partner server IP (103.x.x.x) from our server. 

I am getting following error
telnet: connect to address 103.x.x.x: Connection timed out

but I am able to telnet other server IP from our server. Also I am able to ping that partner server from other server

what will be the reason? i ask the partner check weather our server IP is blocked by their firewall. they checked and told no

I am using CentOS 7.2

Please help me to fix the issue

Thanks in advance

user231410
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1 Answers1

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If you received a Connection timed out error message on telnet but can ping it, there is a firewall somewhere droping your telnet connection.

To discover where there is a firewall, use tcptraceroute 103.x.x.x 23.

It is like the common traceroute, but uses TCP packets, not ICMP packets. You will be able to detect where the packets are being droped.

ThoriumBR
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