Looks like you are troubleshooting in wrong direction due to the fact that number of "stars"/Characters" in password screen is always shown as 15 in that screen.
What I believe is that your SQL Server is running under "Windows Authentication and you are trying to login with a SQL Account. To correct that, please change the Authentication Mode of mixed.
http://msdn.microsoft.com/en-us/library/ms188670.aspx
if issue is not solve after this, please share the error message and
errorlog
Balmukund Lakhani | Please mark solved if I've answered your question, vote for it as helpful to help other user's find a solution quicker
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