Sir I have phpbb2 forum which in on linux whm server. some one try to hack it. How to stop these sql injections and server security mode. I have csf firewall. Please suggest. Thanks
sit back and let csf handle the excessive connections, or ask your host to firewall the adress performing the attacks. If its sql injections then make sure your phpbb is fully patched for any known exploits.
Good thing you have CSF, but I wouldn't just stop at having it active. Make sure you have mod security enabled. Also, make sure CSF bans the malicious user after 5 failures or so. Definitely be sure you are current on the version of phpbb2, MySQL, PHP, Apache, and every other package the server uses. Also, make sure you go through the "check server security" link and fix any major issues.