Exception in LdapSyncTask

[JoergBruenner]

Hi,

I've connected my DT v4.12.0 to our Active Directory. The login works fine. The AD in general works fine too.
I see the following exception in the API server log:

2025-03-24 10:10:38,180 INFO [LdapSyncTask] Starting LDAP synchronization task
2025-03-24 10:10:38,203 ERROR [LdapSyncTask] Error occurred during LDAP synchronization
javax.naming.AuthenticationException: [LDAP: error code 49 - 80090308: LdapErr: DSID-0C090510, comment: AcceptSecurityContext error, data 775, v4563 ]
at java.naming/com.sun.jndi.ldap.LdapCtx.mapErrorCode(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtx.processReturnCode(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtx.processReturnCode(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtx.connect(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtx.(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxFromUrl(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(Unknown Source)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(Unknown Source)
at java.naming/javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at java.naming/javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at java.naming/javax.naming.InitialContext.init(Unknown Source)
at java.naming/javax.naming.InitialContext.(Unknown Source)
at java.naming/javax.naming.directory.InitialDirContext.(Unknown Source)
at alpine.server.auth.LdapConnectionWrapper.createDirContext(LdapConnectionWrapper.java:128)
at alpine.server.tasks.LdapSyncTask.inform(LdapSyncTask.java:59)
at alpine.event.framework.BaseEventService.lambda$publish$0(BaseEventService.java:110)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
2025-03-24 10:10:38,203 INFO [LdapSyncTask] LDAP synchronization complete

Does anyone has an idea what's wrong?

Thanks a lot for your help