FTP suddenly no longer works

This has been a chronic problem with Dreamweaver for me. I searched these forums and see plenty of people with the same problem and plenty that reporting  DW works fine for them. Well... I'm glad Dreamweaver's FTP works for so many of you BUT is there anyone who has had this problem and has figured out why my CS3 DW no longer will log in to a site where it used to work? Or anybody know of a link to a post that has an honest to goodness solution? One by one multiple DW sites I maintain will no longer allow me access to the server. I am now forced to upload using an FTP client.
This isn't about one site, its hit and miss for 20 sites! All with different settings. None of the settings have changed—they should still work. However, DW no longer cooperates. I've tried every combination imaginable of options. With no luck. Not all my sites do this but one by one more and more of them no longer will access their servers. Its like a disease slowly spreading.
Is there a fix?
Mac OS 10.5.5
DW CS3

Thanks for your reply Murray,
Nothing has changed in my server settings or my local network. I read the instructions at the URL you supplied. I removed my router from my  internet connection and even while connecting directly through the cable modem I cannot access the FTP servers to any of my 20 sites.
I don't use virus protection as I am on a Mac and I'm careful where I go and what I expose myself to.
If FTP configurations are enough to prevent me from accessing these servers, why is it that while using these exact same settings I can still access these servers (consistently) using another FTP client?
If a simple FTP client works for me here I would think that the problem is with Dreamweaver. But if its on my end I would love to discover what's wrong and fix it. I am considering uninstalling and reinstalling DW. Wondering if anyone has solved their problems that way?
Last year when this problem first started happening with only one site, I grabbed an older copy of the file that Dreamweaver stores the FTP information in. Replaced that file with TimeMachine and my DW FTP worked for a several months. Problem is that file keeps getting corrupt and now ALL my sites are inaccessible.
It will take a couple of days (I have many irons in the fire) but will come back and post whether I've been successful using the Troubleshooting URL you posted. Thanks.

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