You probably edited the DNS and forgot about it.Hey guys, just woke up and made an interesting discovery. My PS3 doesn't ask me to update. It says i have the newest firmware. I even signed out of PSN and signed back in just to make sure. On the other hand my roommate's PS3 asks him to update to 3.56. We are both using the same (PS3_Custom_Firmware_v3.55_Backup_Manager_Patched_ Wutangrza-kmeaw) CFW.
The only difference is that i installed 3.55 via recovery method in addition to the CFW via recovery as well. My roommate installed them both just from XMB. Hope this info helps somehow. Right now im online playing black ops on CFW 3.55!