You can see that the connection is available (this is also apparent when the VM is ping'd). When telneting, you can see that the connection to the VM was successful however maintaining that connection on 7001 was unsuccessful, thus closing the foreign port. The telnet response message connection on 7001 is Connection closed by foreign host.

telnet 172.16.101.155 7001
Trying 172.16.101.155
Connected to 172.16.101.155.
Escape character
Connection closed by foreign host.

This is caused when trying to bind to port 7001, it means something has to use such port. If nothing is using such port then you cannot connect to it, which in this case it's weblogic admin server.

You can investigate the issue by running following command within terminal, netstat -nat | grep LISTEN

# netstat -nat | grep LISTEN
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      
tcp        0      0 0.0.0.0:38972               0.0.0.0:*                   LISTEN      
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      
tcp        0      0 127.0.0.1:631               0.0.0.0:*                   LISTEN      
tcp        0      0 ::ffff:127.0.0.1:7001       :::*                        LISTEN  (Available Locally!)    
tcp        0      0 ::1:7001                    :::*                        LISTEN  (Available Locally!)
tcp        0      0 ::1:25                      :::*                        LISTEN      
tcp        0      0 :::23                       :::*                        LISTEN      
tcp        0      0 ::1:631                     :::*                        LISTEN   

You need to alter the iptables to allow port 7001 to be accepted. In order to alter the iptables, you need to log into terminal as root. Once logged in, perform the following command:

[root@localhost bin]# sudo iptables -I INPUT -p tcp --dport 7001 -j ACCEPT

[root@localhost bin]# /etc/init.d/iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[  OK  ]

Once you've done that, you need to either restart the iptables or to restart the VM instance. The command below allows you to restart te iptables services

/etc/init.d/iptables restart

[oracle@localhost OIM11gR2PS2_domain]$ netstat -anp | grep 7001
tcp        0      0 fe80::20c:29ff:fe5e:26:7001 :::*                        LISTEN      3667/java           
tcp        0      0 ::1:7001                    :::*                        LISTEN      3667/java           
tcp        0      0 ::ffff:127.0.0.1:7001       :::*                        LISTEN      3667/java           
tcp        0      0 ::ffff:172.16.101.155:7001  :::*                        LISTEN      3667/java   

When Weblogic console is down, the port numbers will not be listening to bind against...

[oracle@localhost OIM11gR2PS2_domain]$ netstat -anp | grep 7001
(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.)
unix  3      [ ]         STREAM     CONNECTED     17001  2479/trashapplet    
[oracle@localhost OIM11gR2PS2_domain]$ 
 

About the author