Cannot find user with identifier username in context 1

[Lohi]

Hallo Forum,

wir haben ein Problem mit der Anbindung an ein AD.

Wir haben die OX App Suite installiert, dazu das OXLdapsync und auch dementsprechend konfiguriert.
Das OX bekommt die User vom AD LDAP und schreibt diese auch in die Datenbank.
Wenn wir jedoch versuchen uns anzumelden erhalten wir eben folgende Meldung in den Logs:
Cannot find user with identifier username in context 1

Leider sind wir mit unserem Latein am ende und können auch mit der Meldung nix mehr anfangen.
Wer weiss rat was uns diese Meldung sagen will und wo wir ansetzen können?

Danke!

LOG

Login:username IP:0:0:0:0:0:0:0:1 AuthID:08acd4987dc54d86b671c1a03c857b5a Agent:Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0 Clientpen-xchange-appsuite(7.2.2-7) Interface:HTTP_JSON Context:1(1,defaultcontex
t) Failed.
Aug 02, 2013 11:13:49 AM com.openexchange.log.internal.callback.ErrorCallba ck log
SEVERE: Logged at: com.openexchange.ajax.Login.loginOperation(Login.j ava:1090)
com.openexchange.ajax.requestNumber=10
com.openexchange.database.schema=configdb
com.openexchange.grizzly.remoteAddress=0:0:0:0:0:0 :0:1
com.openexchange.login.authId=08acd4987dc54d86b671 c1a03c857b5a
com.openexchange.login.client=open-xchange-appsuite
com.openexchange.login.clientIp=0:0:0:0:0:0:0:1
com.openexchange.login.login=username
com.openexchange.login.userAgent=Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0
com.openexchange.login.version=7.2.2-7

USR-0015 Categories=ERROR Message='Cannot find user with identifier username in context 1.' exceptionID=982678454-10
USR-0015 Categories=ERROR Message='Cannot find user with identifier username in context 1.' exceptionID=982678454-10
at com.openexchange.exception.OXExceptionFactory.crea te(OXExceptionFactory.java:158)
at com.openexchange.groupware.ldap.LdapExceptionCode. create(LdapExceptionCode.java:202)
at com.openexchange.groupware.ldap.RdbUserStorage.get UserId(RdbUserStorage.java:158)
at com.openexchange.groupware.ldap.CachingUserStorage .getUserId(CachingUserStorage.java:217)
at com.openexchange.login.internal.LoginPerformer.fin dUser(LoginPerformer.java:281)
at com.openexchange.login.internal.LoginPerformer.doL ogin(LoginPerformer.java:189)
at com.openexchange.login.internal.LoginPerformer.doL ogin(LoginPerformer.java:136)
at com.openexchange.login.internal.LoginPerformer.doL ogin(LoginPerformer.java:132)
at com.openexchange.ajax.Login$11.doLogin(Login.java: 979)
at com.openexchange.ajax.Login.loginOperation(Login.j ava:1043)
at com.openexchange.ajax.Login.doLogin(Login.java:966 )
at com.openexchange.ajax.Login$1.handleRequest(Login. java:222)
at com.openexchange.ajax.Login.doJSONAuth(Login.java: 784)
at com.openexchange.ajax.Login.doGet(Login.java:768)
at com.openexchange.ajax.Login.doPost(Login.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:727)
at com.openexchange.ajax.AJAXServlet.service(AJAXServ let.java:514)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:820)
at com.openexchange.http.grizzly.service.http.OSGiSer vletHandler$FilterChainImpl.doFilter(OSGiServletHa ndler.java:405)
at com.openexchange.http.grizzly.servletfilter.Reques tReportingFilter.doFilter(RequestReportingFilter.j ava:127)
at com.openexchange.http.grizzly.service.http.OSGiSer vletHandler$FilterChainImpl.doFilter(OSGiServletHa ndler.java:395)
at com.openexchange.http.grizzly.servletfilter.Wrappi ngFilter.doFilter(WrappingFilter.java:184)
at com.openexchange.http.grizzly.service.http.OSGiSer vletHandler$FilterChainImpl.doFilter(OSGiServletHa ndler.java:395)
at com.openexchange.http.grizzly.service.http.OSGiAut hFilter.doFilter(OSGiAuthFilter.java:140)
at com.openexchange.http.grizzly.service.http.OSGiSer vletHandler$FilterChainImpl.doFilter(OSGiServletHa ndler.java:395)
at com.openexchange.http.grizzly.service.http.OSGiSer vletHandler$FilterChainImpl.invokeFilterChain(OSGi ServletHandler.java:373)
at org.glassfish.grizzly.servlet.ServletHandler.doSer vletService(ServletHandler.java:252)
at org.glassfish.grizzly.servlet.ServletHandler.servi ce(ServletHandler.java:194)
at com.openexchange.http.grizzly.service.http.OSGiMai nHandler.service(OSGiMainHandler.java:190)
at org.glassfish.grizzly.http.server.HttpHandler.doHa ndle(HttpHandler.java:164)
at org.glassfish.grizzly.http.server.HttpHandlerChain .service(HttpHandlerChain.java:196)
at org.glassfish.grizzly.http.server.HttpHandler.doHa ndle(HttpHandler.java:164)
at org.glassfish.grizzly.http.server.OXHttpServerFilt er.handleRead(OXHttpServerFilter.java:290)
at org.glassfish.grizzly.filterchain.ExecutorResolver $9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterCha in.executeFilter(DefaultFilterChain.java:265)
at org.glassfish.grizzly.filterchain.DefaultFilterCha in.executeChainPart(DefaultFilterChain.java:200)
at org.glassfish.grizzly.filterchain.DefaultFilterCha in.execute(DefaultFilterChain.java:134)
at org.glassfish.grizzly.filterchain.DefaultFilterCha in.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(Pr ocessorExecutor.java:78)
at org.glassfish.grizzly.nio.transport.TCPNIOTranspor t.fireIOEvent(TCPNIOTransport.java:770)
at org.glassfish.grizzly.strategies.AbstractIOStrateg y.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStr ategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStr ategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStr ategy$WorkerThreadRunnable.run(WorkerThreadIOStrat egy.java:135)
at com.openexchange.threadpool.internal.CustomThreadP oolExecutor$Worker.runTask(CustomThreadPoolExecuto r.java:799)
at com.openexchange.threadpool.internal.CustomThreadP oolExecutor$Worker.run(CustomThreadPoolExecutor.ja va:826)
at java.lang.Thread.run(Thread.java:724)