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+Network Working Group                           Alex McKenzie
+RFC #374                                        BBN
+NIC 11099                                       19 July 1972
+
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+There are two significant developments in the operation of the network
+which should be of interest to all sites:
+
+NEW IMP SYSTEM IS RELEASED !
+   On Tuesday July 18, the new IMP software described in previous RFC's
+   (#331,#343,#359) was apparently successfully released.  We ran from
+   10:00am on that day until Wednesday afternoon with very few network
+   problems attributable to the new system.  We are quite pleased with
+   this performance, and expect to leave the new system up permanently!!
+
+   We are, of course, aware that in any system of this size, bugs may
+   crop up at any time, and we solicit the help of the network community
+   in finding them.  We also believe that the new system may have a
+   different "feel" to users, both terminal users and Hosts.  We urge
+   everyone to have a bit of patience while getting used to any change in
+   the "feel" of the network.  On the other hand, PLEASE REPORT ANY
+   SUSPECTED NETWORK MALFUNCTION TO THE NCC AS SOON AS POSSIBLE.
+   Evidence of bugs, guesses as to what went wrong, etc., are always
+   useful in hunting bugs, but don't let the lack of positive proof delay
+   the reporting of suspected system malfunction.  The NCC telephone
+   number is (617) 661-0100.  Feel free to call collect!
+
+   The one known shortcoming of the new software is the exacerbation of a
+   long-standing TIP software problem.  The TIP now often appears to
+   neglect sending an Allocate control message for some active
+   connection, with the effect that the Server-to-User path becomes
+   blocked.  We are giving the solution of this problem the highest
+   priority!  (Our current data seems to indicate that this problem is
+   most likely to occur when there are several users and when the Server
+   Host is a TENEX system.  If you know of other situations where this
+   problem has occurred, please let us know!)
+
+   Now that the new system is up, all sites with Model 516 IMPs will be
+   contacted by telephone and asked to reset the switches on their IMPs
+   as follows:
+
+             HALT INH         - on
+             W.D.T.           - on
+             AUTO RSTRT       - on
+             MEMORY PRTCT     - on
+
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+                                                                [Page 1]
+
+SITE POWER PROBLEMS
+   The network has recently been experiencing serious difficulties
+   related to the annual problem of more demand for electricity than is
+   available during the summer months.  For example:
+
+       During the month of June, between 1/4 and 1/2 of the
+       IMP down time was due to site power failure.
+
+       During the weekend of July 15-16, two sites were down
+       all weekend due to air-conditioning failure which was
+       apparently related to power failures or brownouts.
+       This left several sites connected to the rest of the
+       net through only one path which, according to Murphy's
+       law, eventually failed - leaving nine sites partitioned
+       from the remainder.
+
+       On July 18, an underground power transformer supplying
+       power to the entire computer room at site 27 failed,
+       putting IMP 27 out of action for several hours (anddit
+       could easily have been several weeks.)
+
+   Obviously in these cases there is little that either the NCC or the
+   site can do to restore service.  We expect these situations to
+   continue or even get worse as the summer continues.  Please try to
+   restrain your annoyance when these situations arise; we don't like
+   them either!
+
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+       [ This RFC was put into machine readable form for entry ]
+       [ into the online RFC archives by BBN Corp. under the   ]
+       [ direction of Alex McKenzie.                      1/97 ]
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+                                                                [Page 2]
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