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Internet Info 1994 March
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Internet Info CD-ROM (Walnut Creek) (March 1994).iso
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ddn-security-9120
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1991-10-20
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**************************************************************************
Security Bulletin 9120 DISA Defense Communications System
21 October 1991 Published by: DDN Security Coordination Center
(SCC@NIC.DDN.MIL) 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-9120).
**************************************************************************
RE-REGISTRATION OF TAC USERS
THIS BULLETIN IS MEANT TO NOTIFY ALL CONCERNED THAT THERE
IS CURRENTLY A PROBLEM WITH THE TIMELINESS OF TAC USERS
BEING RE-REGISTERED WITH THE NETWORK INFORMATION CENTER (NIC)
ONCE THEIR HOSTS ARE MOVED BEHIND CONCENTRATORS/GATEWAYS.
SPECIFICALLY, WHEN A MILNET DIRECT-CONNECTED HOST IS
DISCONNECTED AMD MOVED BEHIND A CONCENTRATOR/GATEWAY HOST,
USERS BEHIND THE ORIGINAL "AUTHORIZING" HOST NEED TO BE RE-
REGISTERED WITH THE CONCENTRATOR/GATEWAY AS THE AUTHORIZING
"HOST." THIS IS NOT HAPPENING IN ALL CASES, OFTEN DUE TO
HOST ADMINISTRATORS ASSUMING THEY WILL CONTINUE TO BE ABLE TO
AUTHORIZE TAC CARDS AFTER THEIR HOST IS RE-CONNECTED, AND TO
CONCENTRATOR/GATEWAY ADMINISTRATORS ASSUMING THAT THEY DO NOT
PLAY A ROLE IN THE TAC CARD AUTHORIZATION PROCESS.
BEGINNING 15 DECEMBER 1991, THE NIC HAS BEEN DIRECTED TO
TERMINATE NETWORK ACCESS TO ALL TAC USERS UTILIZING TAC CARDS
REGISTERED TO "OLD" DIRECT CONNECTED HOSTS. THE USE OF THESE
CARDS IS NO LONGER AUTHORIZED UNLESS RE-REGISTRATION HAS BEEN
ACCOMPLISHED AS DESCRIBED ABOVE. IN THE FUTURE, TAC ACCESS
WILL BE TERMINATED WITHIN 15 DAYS AFTER ANY HOST HAS BEEN
DECONFIGURED. IT IS, THEREFORE, INCUMBENT UPON HOST
ADMINISTRATORS TO COORDINATE WITH THE ADMINISTRATOR OF THE
CONCENTRATOR/GATEWAY AND WITH THE NIC REGISTRAR TO ARRANGE THE
TIMELY RE-REGISTRATION OF TAC USERS PRIOR TO THE DISCONNECTION
OF THE HOST TO WHICH THOSE TAC USERS WERE ORIGINALLY REGISTERED.
FOR FURTHER INFORMATION REGARDING THIS GENERAL POLICY OR TO
COORDINATE SPECIFIC CASES, PLEASE SEND A MESSAGE TO
REGISTRAR@NIC.DDN.MIL OR CALL 1-800-365-3642/703-802-4535.