Server problem

Glad you got around the IP issue. Unfortunately, that means your other IP was used by 'bad' people in the past (or currently) and is something that does happen with shared servers on shared IP addresses.

As for the App ID / Secret error, no, it's not a common issue. I hate to say it, but can double and triple check that your App ID and Secret key are correct? That's the only reason I know of that you'd get that error. If they are right, it shouldn't be a problem.

One thing you can try is to go to developers.facebook.com/apps, go into your app, and then use the "Reset Key" link next to your secret key. That will generate a new secret key. Try using that. Maybe something weird happened. If that doesn't help, let us know, and we'll help investigate further.

Thanks,
Alex

Elizabeth,
Above you mentioned that you purchased a dedicated IP address. Did that dedicated IP not work? If not, you should contact your hosting company and see if you can get switch to a new dedicated IP. The hosting company should have a lot of reserves and be able to switch you. It may just be that you need to try a few to find one that hasn't been abused by a previous user.

Unfortunately, Facebook isn't the most responsive to some of these requests. Sometimes, they can help clear things up, other times they don't seem to get back too quickly.

Hope that helps, and definitely hope your hosting company will be able to help you out quicker!

Thanks,
Alex

I really don't. It's not a matter of a reliable host. This is a case where the host may be blamed incorrectly. Basically, an admin in the past setup a website on your hosts server. That site, in some way, annoyed Facebook. Facebook then blacklisted the site. So, the host isn't really to blame, and they own the IP address, but aren't really at fault.

On a side note, I just re-read the error message you're getting again. It says "Unauthorized source IP address". When we've seen blacklisted IPs in the past, I believe the error message was more overt ("Your IP has been blacklisted", or something to that effect). Can you go to the Facebook App Developers Area . When there, edit your app and go to the Settings -> Advanced. Then, check and make sure that both the "Server IP Whitelist:" and "Update Settings IP Whitelist:" settings are blank. There shouldn't be any IP addresses in those fields. Those fields will restrict app access to only specific IP addresses and generally shouldn't be used.

Hope that helps either explain.. or even fix the problem!

Let us know how it goes,
Alex

Elizabeth,
Sorry to hear my new idea wasn't the cause. Didn't think it would be, but it is something you would have control of. Beyond that, I only can really suggest contacting your hosting provider to see if they can swap out your current dedicated IP for a different one so that you can test out the new one.

Best of luck, and keep us posted on how it goes!

Thanks,
Alex