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Security Bulletin 9203                  DISA Defense Communications System
February 4, 1992            Published by: DDN Security Coordination Center
                                     ([email protected])   1-(800) 365-3642

                       DEFENSE  DATA  NETWORK
                         SECURITY  BULLETIN

The DDN  SECURITY BULLETIN is distributed  by the  DDN SCC  (Security
Coordination Center) under DISA contract as  a means of  communicating
information on network and host security exposures, fixes, &  concerns
to security & management personnel at DDN facilities.  Back issues may
be  obtained  via  FTP  (or  Kermit)  from  NIC.DDN.MIL  [192.112.36.5]
using login="anonymous" and password="guest".  The bulletin pathname is
scc/ddn-security-yynn (where "yy" is the year the bulletin is issued
and "nn" is a bulletin number, e.g., scc/ddn-security-9203).
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                       REGISTRATION OF TAC USERS

     On 21 October 91, the Defense Information Systems Agency
     (DISA) published DDN Security Bulletin 9120, which discussed a
     problem with the timeliness of TAC users being re-registered
     with the Network Information Center (NIC).  This problem
     surfaced as a result of MILNET hosts being deconfigured and
     moved behind concentrators/gateways.  In Security Bulletin
     9120, the 15th of December had been set as the date the NIC
     was to terminate network access to all TAC users utilizing
     TAC cards registered to deconfigured hosts that had previously
     been direct-connected to the DDN.

     The purpose of this bulletin is to advise all concerned that
     the 15 December 91 termination date has been extended.  The
     reason for this decision is simple--there was not enough
     time to clear the logjam of users requiring re-registration
     processing both at the MILDEP level and at the NIC.  The
     process of re-registering TAC users who now fall behind
     concentrators/gateways had become a difficult and convoluted
     problem.  However, DISA and the Military Departments have had
     several meetings on this issue and have come to agreement on
     how to solve the problem long-term.  Therefore, once new
     registration procedures are implemented and re-registration
     is moving smoothly, a new termination date for TAC cards
     issued under the "old" deconfigured hosts will be set.
     This will probably occur within the next few months and will
     be done in conjunction with the annual re-registration
     process.

     If there are any questions, please contact Major Boyd at
     Comm (703) 692-7580 or DSN 222-7580, e-mail to [email protected].


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