iPhone App Password Auth Failure

I have encountered an issue with the iPhone App and was hoping for some guidance.

Right now, I have the app pointing to the proper IP and port, but I seem to be getting auth failures. Here's what I see:
-When I try logging in as me (administrator) I get INVALID_PASSWORD
-When I try logging in as other people I either get:
NO_SUCH_USER or
INVALID_PASSWORD

However, there are occasions where I get INVALID_PASSWORD when there is no user of whatever name I put in.

We are running SupportCenter Plus on a Windows Server 2008 machine using the local instance of MSSQL 2008 R2. I can log into the mobile version of the site fine, but not through the app.

Any ideas?