Trouble shooting LDAP Configuration

Folks,

How do folks go about trouble shooting AuthC issues? I've used the JExplorer LDAP browser to ensure that my URL is correct and I know that the same URL works in Apache. Is there a particular log4j appender class that I ought to configure to get a glimpse of what the problem might be.

I've included some debug input as well as the relevant config elements. Apparently, my LDAP mojo is weak. :(

main-config.xml
-

<auth-type>
<login-module />
<login-description>Hey.</login-description>
<guest-login allowed="true" />
</auth-type>


ldap-config.properties
-

java.naming.referral=follow
java.naming.provider.url=ldap://ldap.xxx.com:389/ou=active,ou=employees,ou=people,o=xxx.com?uid
java.naming.security.authentication=simple
loginFilter=.+

TRACE
-

TeamCity 3.1.2 (build 6881) initialized, OS: Linux, JRE: 1.5.0_10-b03
INFO - jetbrains.buildServer.SERVER - TeamCity is running in enterprise mode

....

ERROR - Side.impl.auth.LDAPLoginModule -

javax.naming.AuthenticationException:
at com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:272)
at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2637)
at com.sun.jndi.ldap.LdapCtx.(LdapCtx.java:283) at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:175) at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:193) at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:136) at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:66) at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:667) at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:247) at javax.naming.InitialContext.init(InitialContext.java:223) at javax.naming.InitialContext.(InitialContext.java:197) at javax.naming.directory.InitialDirContext.]]>(InitialDirContext.java:82)
at jetbrains.buildServer.serverSide.impl.auth.LDAPLoginModule.login(