OWA 500 Error after login

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    For the last 6 months I have enjoyed the near flawless operation of my OWA Server. Monday that ceased, following a power failure in our data center OWA is no longer able to communicate with Exchange.
    Current configuration
    NETDIAG passed tests
    owa front end server

    Exchange backend server


    Static ip addresses with the correct addresses and DNS server.

    The SA will not start on OWA

    Getting a DS error

    Event Type: Error
    Event Source: MSExchangeDSAccess
    Event Category: Topology
    Event ID: 2114
    Date: 2/8/2006
    Time: 3:39:36 PM
    User: N/A
    Computer: Exchange
    Process EXMGMT.EXE (PID=1264). Topology Discovery failed, error 0x8007077f.

    I have reconfigured IIS and Exchange authentication based on Article ID:327843

    I am able to telnet to the prescribed ports
    For Exchange Communication:
    o Port 80 for HTTP
    o Port 691 for Link State Algorithm routing protocol
    * For Active Directory communication:
    o Port 389 for LDAP (TCP and UDP)
    o Port 3268 for Global Catalog Server LDAP (TCP)
    o Port 88 for Kerberos Authentication (TCP and UDP)

    Any Suggestions.

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