Interesting! I've never really noticed (or used) this feature before.
Fireworks contains no preferences about site info and passwords, so it must be referencing information from Dreamweaver. The password being requested is site-specific; it's got to be the same password stored by Dreamweaver as part of the site definition (within the basic server settings).
That said, I cannot get my password to be accepted either. I'm finding this to be a problem in both Fireworks CS6 and CS5.1. The workaround I'd suggest is to keep Dreamweaver open and use it to upload the image to your server, instead of Fireworks.
I had think FW CS5 it works properly
i now can do it with Dreamweaver, but it was easy to do in Fireworks
strange that it no longer works in CS6 hope there is a solution
other hand, the two arrows up and dowloaden there not for nothing in FW
(sorry for my poor Englisch)
Here's an Adobe help page related to the File Management button:
Unfortunately, I don't see any clues or solutions here.
Thanks Groove25 for you comment !
I think i have not the good institutions in Dreamwever
dit not understnad wat the next rule mean (my poor Englisch)
Before using check-in and check-out options in Fireworks, select the Enable File Check In And Check Out option for the Dreamweaver site in which the document resides.
maybe someone write here wath i exactly most do in Dreamweaver so it works
i set bij the server setting advanced,: select the File Check In And Check Out option en set to Enable en than i fill in a name
but nothing help