telnet ipaddress port not connecting

vinaytp · 11-11-2009, 06:57 AM

Hi all...

In a remote machine port 25 is open its enabled in firewall also...but not able to connect through telnet..why ?

netstat -an | grep 25

Code:

tcp        0      0 0.0.0.0:44525               0.0.0.0:*                   LISTEN      
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      
tcp        0      0 127.0.0.1:9021              127.0.0.1:52527             ESTABLISHED 
tcp        0      0 127.0.0.1:25                127.0.0.1:53250             ESTABLISHED

telnet <ipaddress> 25

Code:

telnet 172.17.65.206 25
Trying 172.17.65.206...
telnet: connect to address 172.17.65.206: No route to host

Can Anyone please help me...

Thanks in advance....

centosboy · 11-11-2009, 07:19 AM

Quote:

Originally Posted by vinaytp

Hi all...

In a remote machine port 25 is open its enabled in firewall also...but not able to connect through telnet..why ?

netstat -an | grep 25

Code:

tcp        0      0 0.0.0.0:44525               0.0.0.0:*                   LISTEN      
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      
tcp        0      0 127.0.0.1:9021              127.0.0.1:52527             ESTABLISHED 
tcp        0      0 127.0.0.1:25                127.0.0.1:53250             ESTABLISHED

telnet <ipaddress> 25

Code:

telnet 172.17.65.206 25
Trying 172.17.65.206...
telnet: connect to address 172.17.65.206: No route to host

Can Anyone please help me...

Thanks in advance....

because only localhost listens on port 25.

if sendmail, you need to edit this line in sendmail.mc

Code:

DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl

or even add another line

Code:

DAEMON_OPTIONS(`Port=smtp,Addr=172.17.65.206, Name=MTA')dnl

or just go with this

Code:

DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA')dnl

for listening on all addresses

JohnGraham · 11-11-2009, 07:24 AM

Quote:

Originally Posted by vinaytp

telnet <ipaddress> 25

Code:

telnet 172.17.65.206 25
Trying 172.17.65.206...
telnet: connect to address 172.17.65.206: No route to host

That there "no route to host" message is telling you it's not a port issue - it's unable to find the machine with the IP address 172.17.65.206. Can you ping it? Are they on the same subnet? What's the address of the machine you're trying to telnet *from*?

John G

centosboy · 11-11-2009, 07:56 AM

Quote:

Originally Posted by JohnGraham

That there "no route to host" message is telling you it's not a port issue - it's unable to find the machine with the IP address 172.17.65.206. Can you ping it? Are they on the same subnet? What's the address of the machine you're trying to telnet *from*?

John G

well it is kind of a port issue.

172.17.65.206 - is not listening on port 25