I have disabled firwall policy for now, and all the communicatons are also blocked with the Client and Server, don't know from where to start :(
(Now the below thing is only for users like me who should have taken precaution)
I had logged case with symantec and all they pointed out STEP 3 in this document was had to be taken seriously before planing the implementation
http://www.symantec.com/business/support/index?page=content&id=TECH224034&profileURL=https%3A%2F%2Fsymaccount-profile.symantec.com%2FSSO%2Findex.jsp%3FssoID%3D1425889035040w10CtFxF5v6I5nBIlkzx1QGbe81iU1nXOhU3F
Step 3: Prepare Symantec Endpoint Protection 11.x managers for migration
•Turn off replication at each site that is configured as a replication partner before you upgrade Symantec Endpoint Protection Manager.
After those clients have updated their policy, you can proceed with the upgrade.
Caution: If this rule set is not disabled, you may face issues at a later stage when you upgrade your clients.
•Remove client packages assigned to the client groups.
If your Symantec Endpoint Protection 11.0 site has client packages assigned to the client groups, remove those packages. The Maintain existing client features when upgrading option on the 11.0 package causes the upgrade to remove all protection technologies from the clients.
I understand the seriousness of what i have done and i don't want any other person doing a stupid thing like me and create a loss for their compnay, so my question is:
While upgrading, why can't symantec POP up a window asking and reminding user "Have you Removed client packages assigned to the client groups ? " Or anyother way asking user that PS : default policy will be applied and so and so ports will be blocked, OR any other message which basically would help user to think before he clicks the NEXT button.
This reminder will help a user to be sure to cross check, his default policy, espcially firewall policy (default) which blocks file sharing (if NTP is installed) and avoid a big outage like mine.
"Your best teacher, is your last mistake"