Problems with connection using SPNego

Hello

I've configured authentication with the SPNegoLoginModule

with basic authentication fallback.

But when I try to connect to EP with not registered user

it returns me a standard logon page (repeated twice!!!)

with an error 'Unknown message (ID = UNKNOWN_ERROR)'

In log file I see following

1 error: Decoding error in parsing of spnego token....

2 error: Error during handshake (has already been reported). Authentication failed.

3 error: doLogon failed [EXCEPTION] com.sap.security.core.logon.imp.UMELoginException

at com.sap.security.core.logon.imp.SAPJ2EEAuthenticator.logon(SAPJ2EEAuthenticator.java:339)....

4 error: Message ID (UNKNOWN_ERROR) not found in properties files-UNKNOWN_ERROR

[EXCEPTION]

java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle, key UNKNOWN_ERROR

at java.util.ResourceBundle.getObject(ResourceBundle.java:325).....

When I enter user/password in appeared logon page it

returns me the same page and adds 3 errors in log file:

1st is the same as 3 in previous case,

2 and 3 are identical with 4 error in prev. case.

My ticket logon stack looks as follows:

com.sap.security.core.server.jaas.EvaluateTicketLoginModule, Flag as Sufficient

ume.configuration.active = true

com.sap.security.core.server.jaas.SPNegoLoginModule, Flag as Optional

- ume.sap.spnego.uid.resolution.mode = simple

- com.sap.spnego.uid.resolution.attr = krb5principalname

- com.sap.spnego.jgss.name = host/...@...

- com.sap.spnego.creds_in_thread = true

com.sap.security.core.server.jaas.CreateTicketLoginModule, Flag as Sufficient

- ume.configuration.active = true

BasicPasswordLoginModule, Flag as Requisite

com.sap.security.core.server.jaas.CreateTicketLoginModule, Flag as Optional

- Ume.configuration.active = true

I use EP6.0 with SPS16

Can anybody help me?

Thanks

Vitali