That FAQ post contains the list of all known connection issues, including updating your router firmware (point 4 under notes - viewtopic.php?f=6&t=3507&p=32731#pms-pms_faq_connectivity_router
) and restarting your router (the first bullet point under that same link). You provided no indication that you had read the FAQ or tried anything from there, so I directed you to the FAQ.
Connections can fail for a variety of reasons, and you just saying "it can't find my PS3" doesn't help diagnose why. That's why I directed you to the FAQ with an additional note on how to provide more information if necessary. I can't really help you if you don't provide the necessary information, and regurgitating the same information that's already in the FAQ doesn't make sense.
An aside regarding the FAQ in general:
Having central sources for support information is crucial to maintain quality and ease of access. That's why FAQs exist, and pointing people to FAQs is a standard support practice. I specifically wrote that post for connection issues (and no, I don't get paid), and other members of the development team (as well as regular forum users) have also contributed content to the FAQ.
If you have constructive criticism for how to better organize/update the content within that post or anywhere else in the FAQ, I'm open to suggestions. But asking me to do all the work for you (which is what it looks like you're doing when asking for a "straight answer") when I have none of the required starting information nor the ability to do the diagnostic work... that's just ludicrous. If you disagree, then more power to you figuring it out.