Those cache times look fine. If this only happens at login, I'd be looking at your LDAP setup. Chances are that something is wrong.
How is your LDAP server specified? Are the DNS records correct? Are they pointing at the right IPs? Is the TLS configuration correct?
30 seconds sounds suspiciously like a timeout thing.
How is your LDAP server specified? Are the DNS records correct? Are they pointing at the right IPs? Is the TLS configuration correct?
30 seconds sounds suspiciously like a timeout thing.