Port issue

[Rahul Pednekar]

Dear all

I'm not able to telnet to port no. 8005 of my server. if i try from server 'A'
#telnet 192.16.7.108 8005

I get a message that its connected but when I issue the same command for the server 'B' i.e.
# telnet 192.16.6.116 8005

I get a message 'could not connect the host'
for your information both are application servers and recently i have changed the IP address of server 'B' using 'setparms' I have also checked the '/etc/services' and i found it that nothing is commented in it.

please assist guyz!

[mirco_1 · Accepted solution]

hi,

the ip is the real?

because is different sublan.

The gatway is ok?

DM

[Kent Ostby]

Try just doing a "regular telnet" to that same IP from server B. Does that get you a login prompt?

[John Dvorchak]

I will assume that you used to telnet to port 8005 before the IP change on "B". Can you ping the new IP address? Please send us the output from the "B" system:

netstat -rn
ifconfig lan0

lan0 assumes that is the active LAN, the netstat -rn will also list the interface number.

[Arunvijai_4]

Hello,

Could you able to ping to Server 'B' ? Also, doing a traceroute may help.

-Arun

[paolo barila]

Try also from the server B to itself

serverB# telnet 192.16.6.116 8005

to check if you have a daemon listening there.


Pablo

[Rahul Pednekar]

Hi All
Thanks for the replies. to understand, bith the servers are in diffrent sublan also i can ping and telnet to each other too. I have changed the ip address of server 'B' and i did not reboot the server. also the server has port aggregation set. one more thing while loading the application the app asks the port 8005/9005 to be opened. once again I'm able to telnet server port 'A' to itself but not 'B' the command i use is
# telnet 192.16.7.116 8005

please assist.

Thanks...
Rahul

[Arunvijai_4]

Hi Rahul,

First of all, after changing your IP address manually, could you able to ping from any other machines ? Did you add the static route ? Is routing table updated ? Check these stuffs first before proceeding to telnet.

-Arun

P.S: Remember to assign points.

[Muthukumar_5]

Can you check this?

Machine A:

grep 8005 /etc/services
telnet localhost 8005
telnet machineB 8005

Machine B:

grep 8005 /etc/services
telnet localhost 8005
telnet machineA 8005

what you are getting for this?

--
Muthu

[Rahul Pednekar]

Hi all
thanks for reply..

How do i check the static route and routing table? please give me the command.

there is no find anything like 8005 in /etc/sevices. on both the servers.

Thnaks in advance..

will surely assign points....:)

[paolo barila]

The routing seems correct since you're able to ping the servers each other (anyway the command to check is # netstat -r)

Please check on server A & B and post:

# netstat -a | grep 8005

There could be a firewall between A and B, ask your network administrator.

[Rahul Pednekar]

hi all

the command #netstat -a | grep 8005 dose not give any output but just gives a prompt. what was the output expected?

Reply to muthukumar

Machine A:
#grep 8005 /etc/services
no output
telnet localhost 8005
Trying....
telnet machineB 8005
Trying...

Machine B:
grep 8005 /etc/services
no output
telnet localhost 8005
Trying....
telnet machineA 8005
Trying....

please try guyz....

Thanks..:(

[paolo barila]

You should see something like

# netstat -a | grep 8005
tcp 0 0 *.8005 *.* LISTEN <-----

If you don't see anything then your application is not listening on port 8005

so check your application

[Muthukumar_5]

You must have an entry in /etc/services for a port and service name. So that service lookup with telnet will work. Else it will make problem.

Try to add servicename and port in /etc/services and start a service with /sbin/init.d/servicename start or configure with inetd.conf file.

Check the netstat statistics as,

# netstat -na | grep port-number

will have to give informations there.

--
Muthu

[Arunvijai_4]

Hi Rahul,

You need to add an entry in /etc/services for port 8005 and restart the application.

-Arun

[Rahul Pednekar]

thanks everybody

Rahul