I an unable to get online plugins it give me not reachable, Although i can ping internet on server through putty.
How we can solve it ?
Perhaps you use selinux (that prevents php script from reaching out the internet, among other thigns). I cannot say for sure. Check if you have selinux enabled, if you do, disable it or follow the options in the FOP2 FAQ that you can see from the "Get Help" menu in our site, that has specific selinux configurations to enable those connections without disabling selinux globally. You can also check the web server error log and see if you notice a specific error that might point out what is your issue exactly.