Inter-Site Replication Issue in win 2003 AD

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    hi!
    we are using windows 2003 server Active Directory environment. we have 4 sites and each site has a single DC whereas our main site have two DC’s, Exchange server 2003 is also installed on one ADC at centarl site. Also at our (central) main site our primary DC is holding all FSMO roles. All DCs are Global catalog servers as well. The problem we are currently facing is that, all my other three sites are unable to replicate with my main (Central) site whereas Intra-Site replication at central site is working fine.

    Event logs shown at one of dc not getting replication are:

    Event ID 4 Kerbros

    The kerberos client received a KRB_AP_ERR_MODIFIED error from the server host/lhr-ex.dwp.com.pk. The target name used was . This indicates that the password used to encrypt the kerberos service ticket is different than that on the target server. Commonly, this is due to identically named machine accounts in the target realm (DWP.COM.PK), and the client realm. Please contact your system administrator.

    Event ID 1311 Knowledge Consistancy Cheker

    he Knowledge Consistency Checker (KCC) has detected problems with the following directory partition.

    Directory partition:
    CN=Configuration,DC=dwp,DC=com,DC=pk

    There is insufficient site connectivity information in Active Directory Sites and Services for the KCC to create a spanning tree replication topology. Or, one or more domain controllers with this directory partition are unable to replicate the directory partition information. This is probably due to inaccessible domain controllers.

    User Action
    Use Active Directory Sites and Services to perform one of the following actions:
    – Publish sufficient site connectivity information so that the KCC can determine a route by which this directory partition can reach this site. This is the preferred option.
    – Add a Connection object to a domain controller that contains the directory partition in this site from a domain controller that contains the same directory partition in another site.

    If neither of the Active Directory Sites and Services tasks correct this condition, see previous events logged by the KCC that identify the inaccessible domain controllers.

    Event ID 1925

    The attempt to establish a replication link for the following writable directory partition failed.

    Directory partition:
    DC=ForestDnsZones,DC=dwp,DC=com,DC=pk
    Source domain controller:
    CN=NTDS Settings,CN=LHR-DC01,CN=Servers,CN=DWP-TECH-HO,CN=Sites,CN=Configuration,DC=dwp,DC=com,DC=pk
    Source domain controller address:
    5770fcca-37d3-4265-ba3b-25413eefc1aa._msdcs.dwp.com.pk
    Intersite transport (if any):
    CN=IP,CN=Inter-Site Transports,CN=Sites,CN=Configuration,DC=dwp,DC=com,DC=pk

    This domain controller will be unable to replicate with the source domain controller until this problem is corrected.

    User Action
    Verify if the source domain controller is accessible or network connectivity is available.

    Additional Data
    Error value:
    2148074274 The target principal name is incorrect.

    Event ID 1566

    All domain controllers in the following site that can replicate the directory partition over this transport are currently unavailable.

    Site:
    CN=DWP-TECH-HO,CN=Sites,CN=Configuration,DC=dwp,DC=com,DC=pk
    Directory partition:
    DC=ForestDnsZones,DC=dwp,DC=com,DC=pk
    Transport:
    CN=IP,CN=Inter-Site Transports,CN=Sites,CN=Configuration,DC=dwp,DC=com,DC=pk

    one more thing, i want to mention is:
    i am also unable to access shared folders shated on server at my central location from remote site DC by netbios and fqdn. ever Sysvol is not accessable by remote sever by name, where as by ip everything is accessable.

    need your urgent support in this regard.

    thanks in advance for your support.

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