SUPPersistenceException loginFail, Sync failed 1497

Hi all

i am developing an prototype app in ios and sup 2.2. Everything was working fine until i got the following error and i dont know why, because i havent changed anything in the connection settings or the MBO:

Error in XCODE:

SUPPersisentenceException: SUPPersistneceException from synchronize: -- loginFail, Sync failed: - 1497

and in the Error logs in the SSC:

2013-06-10 09:49:02.905  Subsystem=Error  Application ID=, Application Connection ID=, User=amueller@admin, Correlation ID=, Transaction ID=, Root Context ID=, Package=, MBO=, Operation=, Thread ID=136, Node ID=CVKOSUP01, Error=authentication failure code = 4000 reason = Login Failed: user 'amueller'

2013-06-10 09:49:02.904  Subsystem=Error  Application ID=, Application Connection ID=, User=amueller@admin, Correlation ID=, Transaction ID=, Root Context ID=, Package=, MBO=, Operation=, Thread ID=136, Node ID=CVKOSUP01, Error=java.lang.SecurityException was thrown by method com.sybase.djc.mobilink.LoginHandler:authenticateUser(String user, String password, String securityConfiguration)\njava.lang.SecurityException: Login Failed: user 'amueller'

    at com.sybase.djc.security.User.login(User.java:489)

    at com.sybase.djc.mobilink.LoginHandler.authenticateUser(LoginHandler.java:374)

    at com.sybase.sup.jmo.services.Registration.authenticateWithMMS(Registration.java:1329)

    at com.sybase.sup.jmo.services.Registration.findTemplate(Registration.java:891)

    at com.sybase.sup.jmo.services.Registration.register(Registration.java:564)

    at com.sybase.sup.jmo.services.Registration.registerForImoChannel(Registration.java:283)

    at com.sybase.sup.jmo.services.Registration.register(Registration.java:260)

    at com.sybase.sup.jmo.services.Registration.register(Registration.java:42)

    at com.sybase.sup.server.iiop.impl.RegistrationHandlerImpl.register(RegistrationHandlerImpl.java:27)

    at com.sybase.sup.server.iiop.impl.RegistrationHandlerImpl_DJC.$invoke(RegistrationHandlerImpl_DJC.java:103)

    at com.sybase.djc.rmi.iiop.server.MessageHandler.processRequest(MessageHandler.java:798)

    at com.sybase.djc.rmi.iiop.server.MessageHandler.run(MessageHandler.java:310)

    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

    at java.lang.Thread.run(Thread.java:662)

praying for help.

Alex