Would the following link help you resolve this issue?
For background, here is a Knowledge Base article, but the performance in 15 may be a bit different than 14 http://help.filemaker.com/app/answers/detail/a_id/14391/kw/credentials%20manager
Beatrice Beaubien, PhD
FileMaker Business Alliance
FileMaker 15 Certified Developer
Knowledge Translation Certified Professional
I looked at thread 163552, where somersdavel50 decided to use local file account instead of External Server authentication. In my situation, we are using External Server Authentication, and Single Sign On is opening the file with the current Windows user, instead of prompting for a domain username.
We migrated away from local FileMaker file accounts so that password management could be handled by the Directory Server.
I don't think there are any user accounts stored in the Credential Manager. Opening a database does create a Generic Credential (FMPEAR: FMS...) with no username. Even if all FileMaker credentials are removed in the Credential Manager, the login is still automatic. When the login prompt is made to appear with the shift key, there is no checkbox to save the password.
There seemed to be similarities between somersdavel50's problem space and your own, so it's unfortunate his resolution didn't help.
We use External Authentication where we can, and when it is implemented we don't see the challenge to provide the domain username. I have no explanation of why you were seeing this in version 14. There is something I'm not understanding.
We also are aware of the problem of people not logging out of shared computers and this can indeed be hard to mitigate.
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Thank you for your posts.
Single Sign On fails in FileMaker Pro 14, and it was addressed in FileMaker Pro 15. This is why you are not seeing the prompt in FileMaker Pro 15.
To turn off Auto-Login, see the following link from Microsoft:
Thanks very much for this, TSGal. We are moving from 13 to 15, so following this thread was of interest; SSO is important to us.
All the best,