'Checksum error' and 'Decode operation failed when decoding payload' when updating Sophos Update Manager

  • Article ID: 119591
  • Rating:
  • 2 customers rated this article 6.0 out of 6
  • Updated: 09 Apr 2014


The Sophos Update Manager (SUM) trace logs shows a checksum error.  An extract of the error from the logs is shown below.

2010-02-08 23:37:46 : Starting to decode C:/Documents and Settings/All Users/Application Data/Sophos/Update
Manager/Working/Decoded-Sub0/F26F7EC0-1302-4DA7-8B6B-A5383051D41A/rms/program files/Sophos/Remote
Management System/TAO_Security.dll IsCancelled? 0
2010-02-08 23:37:46 : EventLog: 3758112772 1 Inserts:> "C:\Documents and Settings\All Users\Application
Data\Sophos\Update Manager\Working\.\Decoded-Sub0\F26F7EC0-1302-4DA7-8B6B-A5383051D41A" "SAVSCFXP"
"F26F7EC0-1302-4DA7-8B6B-A5383051D41A" "RECOMMENDED" "F26F7EC0-1302-4DA7-8B6B-A5383051D41A"
"Checksum error: c73e66e26bb3f727739f74d2db2d1ec2x000 -> TAO_Security.dll"
2010-02-08 23:37:46 : Cmd-ALL << [E4004][C:\Documents and Settings\All Users\Application Data\Sophos\Update
RECOMMENDED][F26F7EC0-1302-4DA7-8B6B-A5383051D41A][Checksum error:
c73e66e26bb3f727739f74d2db2d1ec2x000 -> TAO_Security.dll] Decode operation failed when decoding payload 'F26F7EC0-
1302-4DA7-8B6B-A5383051D41A'. Details: Checksum error: c73e66e26bb3f727739f74d2db2d1ec2x000 -> TAO_Security.dll

First seen in
Sophos Update Manager



What To Do

You have two choices:

  • Let SUM fix itself. If it is a small number of corruptions then it might be easier to let SUM sort itself out in the next update cycle.
  • Delete the contents (not the folder) of the Warehouse and force an update. SUM will now download ALL files again.  For the possible locations of the Warehouse folder see article 63184.

Note: If something external is causing files to continuously become corrupted then this needs to be looked into separately.  Check the log for the problematic file and use article 111843 to see if the file can be manually downloaded in a web browser (check the file size on a computer not passing through your perimeter network security, i.e., firewall or proxy)

If you need more information or guidance, then please contact technical support.

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