Cannot connect to iChat Server from Leopard Client

I just installed Leopard Server fresh and did all of the software updates. I let Directory Utility configure my Leopard client machine to setup all of the accounts. When I try to connect with iChat, I get the following prompt:
*Please type your Kerberos password for patrick@LKDC:SHA1.48E73...0D0.*
I enter my password on the server, and I then get:
*Kerberos Login Failed:*
Cannot resolve network address for KDC in requested realm.
My co-worker has a similar problem, but it instead asks him to type in the Kerberos password for "[email protected]". It also fails for him.
Keep in mind this is a freshly-installed Leopard Server set for basic usage. I'm literally shocked that it doesn't *just work*. I'm even more shocked that nothing I seem to try actually has any result on fixing it.
What am I doing wrong? (Or rather, what is Leopard Server doing wrong, since all I did was follow the instructions to install this thing.)
Thanks,
Patrick

Yes, the problem turned out to be that when I initially installed Leopard, the IP address I was using didn't have a reverse DNS entry. Leopard should really provide a WARNING when this is the case, as it causes so many problems across the board, and I've read so many other users having other problems because their DNS was not set up properly. Since there is no easy way to remedy this once it's installed, it's even more pertinent that an administrator be notified at the time of installation that this is the case. I fixed my DNS issue and reinstalled Leopard Server, and that solved the problem. (And yes, I will file a bug report with Apple.)

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    ExternalHostname                   : mail.domain.com
    InternalHostname                   : mail.domain.com
    ExternalClientAuthenticationMethod : Negotiate
    InternalClientAuthenticationMethod : Ntlm
    IISAuthenticationMethods           : {Basic}
    XropUrl                            :
    ExternalClientsRequireSsl          : True
    InternalClientsRequireSsl          : True
    MetabasePath                       : IIS://EXCHSERV.domain.com/W3SVC/1/ROOT/Rpc
    Path                               : D:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\rpc
    ExtendedProtectionTokenChecking    : None
    ExtendedProtectionFlags            : {}
    ExtendedProtectionSPNList          : {}
    AdminDisplayVersion                : Version 15.0 (Build 775.38)
    Server                             : EXCHSERV
    AdminDisplayName                   :
    ExchangeVersion                    : 0.20 (15.0.0.0)
    Name                               : Rpc (Default Web Site)
    DistinguishedName                  : CN=Rpc (Default Web
                                         Site),CN=HTTP,CN=Protocols,CN=EXCHSERV,CN=Servers,CN=Exchange Administrative
                                         Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=domain,CN=Microsoft
                                         Exchange,CN=Services,CN=Configuration,DC=domain,DC=com
    Identity                           : EXCHSERV\Rpc (Default Web Site)
    Guid                               : 596ed7a1-ceec-4a36-9cbc-617ac5214463
    ObjectCategory                     : domain.com/Configuration/Schema/ms-Exch-Rpc-Http-Virtual-Directory
    ObjectClass                        : {top, msExchVirtualDirectory, msExchRpcHttpVirtualDirectory}
    WhenChanged                        : 12/23/2013 2:20:41 AM
    WhenCreated                        : 11/25/2013 2:51:36 PM
    WhenChangedUTC                     : 12/23/2013 7:20:41 AM
    WhenCreatedUTC                     : 11/25/2013 7:51:36 PM
    OrganizationId                     :
    OriginatingServer                  : DOMAINCONTROLLER.domain.com
    IsValid                            : True
    ObjectState                        : Changed
    Thanks in advance

    Hi,
    According to your description, users cannot connect to Exchange server 2013 both internal and external.
    Please run Test E-mail AutoConfiguration in Outlook to check your autodiscover service. Also
    reset your Exchange virtual directory to connect correctly. If the issue still continues after all configurations are setting properly, collect some Event logs would be helpful.
    If there is any question, please post the results here for further analysis.
    Thanks,
    Winnie Liang
    TechNet Community Support

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