I've added the AD Plugin 1.31 to my Jenkins installation and it works as long as my users don't have swedish characters in their full name in the AD. For example, username test.testsson with full name Test Testsson will work just fine. Username bjorn.borg with full name Björn Borg will fail.

I'm pretty sure this has something to do with it:
CN=Bj\u00F6mrn Borg,OU=Users,DC=my,DC=Domain

If I change Björns full name to "Bjorn Borg" in AD, it works just fine:
CN=Bjorn Borg,OU=Users,DC=my,DC=Domain

Is there a work-around or a fix?

/Jocke

Here is a Log example:

Apr 22, 2013 10:20:44 AM hudson.plugins.active_directory.ActiveDirectorySecurityRealm
FINE: Connecting to ldap://server.my.domain:3268/

Apr 22, 2013 10:20:44 AM hudson.plugins.active_directory.ActiveDirectorySecurityRealm
FINE: _gc._tcp.my.domain resolved to [server.my.domain:3268]

Apr 22, 2013 10:20:44 AM hudson.plugins.active_directory.ActiveDirectorySecurityRealm
FINE: SRV record found: 0 100 3268 server.my.domain.

Apr 22, 2013 10:20:44 AM hudson.plugins.active_directory.ActiveDirectorySecurityRealm
FINE: Attempting to resolve _gc._tcp.my.domain to SRV record

Apr 22, 2013 10:20:17 AM hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider
FINE: Failed toretrieve user bjorn.borg
org.acegisecurity.BadCredentialsException: Failed to retrieve user information for bjorn.borg; nested exception is javax.naming.InvalidNameException: CN=Bj\u00F6mrn Borg,OU=Users,DC=my,DC=domain: [LDAP: error code 34 - 0000208F: LdapErr: DSID-0C090715, comment: Error processing name, data 0, v1db1]; remaining name 'CN=Bj\u00F6mrn Borg,OU=Users,DC=my,DC=domain'
at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider.retrieveUser(ActiveDirectoryUnixAuthenticationProvider.java:309)
at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider.retrieveUser(ActiveDirectoryUnixAuthenticationProvider.java:193)
at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider.retrieveUser(ActiveDirectoryUnixAuthenticationProvider.java:137)
at org.acegisecurity.providers.dao.AbstractUserDetailsAuthenticationProvider.authenticate(AbstractUserDetailsAuthenticationProvider.java:122)
at org.acegisecurity.providers.ProviderManager.doAuthentication(ProviderManager.java:200)
at org.acegisecurity.AbstractAuthenticationManager.authenticate(AbstractAuthenticationManager.java:47)
at org.acegisecurity.ui.webapp.AuthenticationProcessingFilter.attemptAuthentication(AuthenticationProcessingFilter.java:74)
at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:252)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:64)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:331)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:227)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.naming.InvalidNameException: CN=Bj\u00F6mrn Borg,OU=Users,DC=my,DC=domain: [LDAP: error code 34 - 0000208F: LdapErr: DSID-0C090715, comment: Error processing name, data 0, v1db1]; remaining name 'CN=Bj\u00F6mrn Borg,OU=Users,DC=my,DC=Domain'
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:3025)
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2840)
at com.sun.jndi.ldap.LdapCtx.c_getAttributes(LdapCtx.java:1332)
at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_getAttributes(ComponentDirContext.java:231)
at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.getAttributes(PartialCompositeDirContext.java:139)
at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.getAttributes(PartialCompositeDirContext.java:127)
at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider.resolveGroups(ActiveDirectoryUnixAuthenticationProvider.java:373)
at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider.retrieveUser(ActiveDirectoryUnixAuthenticationProvider.java:293)
... 35 more