RAS: ATG client intermitten error in merlin_b75 c1, c2 on winNTsp5 & win2ksp1

JDK version
=============
java version "1.4.0-beta_refresh"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta_refresh-b75)
Java HotSpot(TM) Client VM (build 1.4.0-beta_refresh-b75, mixed mode)

java version "1.4.0-beta_refresh"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta_refresh-b75)
Java HotSpot(TM) Server VM (build 1.4.0-beta_refresh-b75, mixed mode)

Platform
=============
Windows_NT JTG-WIN11 4 00 586

Windows_NT JTG-WIN3 5 00 586

Error message
=============
run.atg: ATG/Dynamo LoopTest Score = (+213java.lang.NullPointerException
        at java.util.Hashtable.get(Hashtable.java:321)
        at atg.core.net.HTTPConnection.getHeaderField(HTTPConnection.java:132)
        at atg.core.net.URLHammerThread.run(URLHammer.java:378)
        at java.lang.Thread.run(Thread.java:539)

Notes
=============
please check http://jtgb4u4c.eng/bigapps for test results tables

Testing results are backupped in
jtg-win1 that can be accessed by telnet (root/admin as id/passwd) or http://jtg-win1
  
How to reproduce bug:
telnet to the hosts shown in web for linux test machine with root/admin as id/passwd
goto z:/1.3NTscripts to execute script and d:/tmp to get the running results
for example:
telnet to jtg-win1 with root/admin as id/passwd
execute sh z:/1.3NTscripts/runxxxxx.ksh stab -server (give the "stab" as 1st para)
cd to d/tmp/runxxx.xxx-server to get the results
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