Not able to ssh from outside network and after ssh my server internet connection is getting lost

Hello Team,

I've installed RHEL7.2 64 bit with Minimum Setting option at my server HP Proliant DL20 Gen 9 Intel and have public address and a virtual internal network.

I've done port forwarded to my server internal private IP Address to public address so that i can ssh from outside.

After fresh installation i've setup internet connection at very begnnning at the time of installation & after installation i was able to ping google.com on console and was able to ssh internally, but as soon as i try to ssh from outside network my internet connection is getting lost and even after rebooting and restarting network service i tried ping google.com its says unable to resolve host.

So after looking many link for solution at web and ended up in reinstalled my Operating system and tried ping google.com surprisingly it was working and tried again ssh internally and after that ping google.com it was working, but as soon as i tried ssh from outside network the internet connection got lost.

NOTE : Early i was using RHEL6 and there was no problem even after ssh from outside network it was working just fine and the reason the switch from RHEL6 to RHEL7 is docker have support for RHEL7 and above.

I've a strong feeling that something is getting updated in network script or somewhere else at my server machine.

I'm lost here, can you please help me, need assistance.

Appericate your help.

Thank You.

Regards,
Amit