IV31173: SOME HTTP REQUESTS SENT BY TSAM WIZARD ARE LARGER THAN 8KB. THE IBM HTTP SERVER RESPONDS WITH "HEADER TOO LARGE".

APAR status

• Closed as program error.

Error description

• Some HTTP requests sent by TSAM wizard are larger than 8KB.
  The IBM HTTP Server responds with "header too large".
  
  
  The  x-targeturl header which is used to forward the
  request to Maximo can get too large with all the custom
  variables set.
  Since this problem only occurs in POSTs (when SR is created),
  the solution will be to move the data from x-targeturl to the
  POST body.
  
  The default header field length is 8 KB.
  The default POST body size is 2 MB or unlimited, depending on
  server config, which should suffice for all customers.
  

Local fix

• Work Around:
  
  Increase the LimitRequestFieldSize in httpd.conf.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of Tivoli Service Automation Manager
  7.2.2.0
  ****************************************************************
  * PROBLEM DESCRIPTION:
  HTTP requests packets are too large
  ****************************************************************
  * RECOMMENDATION:
  This problem may occur if more than one UI extension is
  installed on the system and / or much information is stored in
  one service request at once.
  For example, adding many additional disks using the "Additional
  Disk Extension for VMware" and adding additional custom values
  to the service request with another customer-provided UI
  extension can lead to problems creating the service request.
  The message from the server will be "400 Bad Request" and "Size
  of a request header field exceeds server limit."
  
  To circumvent the problem, execute the following steps:
  1. Log on to management server
  2. Stop IHS using /opt/IBM/HTTPServer/bin # ./apachectl stop
  3. Edit /opt/IBM/HTTPServer/conf/httpd.conf and change the
  property LimitRequestFieldSize from 8192 to 16384 (double again
  if problem persists)
  4. Start IHS using /opt/IBM/HTTPServer/bin # ./apachectl start
  
  For permanent resolution apply Tivoli Service Automation Manager
  7.2.4 Fixpack 1 when available.
  

Problem conclusion

• The root cause of this problem is the way the service requests
  are created using a header field in the HTTP request to a proxy
  servlet.
  By default, many http servers limit header fields for DOS attack
  prevention. Extending the field size is only the second best
  solution as submitted POST requests should contain their data in
  the HTTP body part instead of the header.
  
  The fix for this APAR is contained in the following maintenance
  packages:
  | fix pack | 7.2.4-TIV-TSAM-FP0001
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  TSAM (& INSTALL

• Fixed component ID

  5724W7800

Applicable component levels