[Koha] Z3950 search problem

[cat tom]

I met a problem when I tried to do a Z3950 Search. After checked the Z targets
  on the popup window and clicked 'search' button, I only got a 'server internal error. The server encountered an internal error or misconfiguration and was unable to complete your request'.  
   
  The traces recorded in the /usr/local/koha/koha-error_log read as below:
  "
  44:14 2007] [error] [client 19x.16x.11x.25x] Premature end of script headers: search.pl, referer: http://192.197.209.239:8080/cgi-bin/koha/z3950/search.pl?bibid=&isbn=1591404398"

   
  Then after read some relevant mailing lists, I started the z3950-daemon-launch.sh. However, the problem remains the same. Even the logged errors remain the same without any useful details. The Z3950 log file is always empty.
   
  Any clues that can help me give heads up to solving the problem?
   
  My box is Debian.
   
   
  Thanks a lot!
   
  Sun
   
   
  The Koha is installed on a debian box. 

 		
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