checksum problem with downloaded disk images

[Richard Peskin]

I am getting consistent checksum validation failure for dmg files  
downloaded. It is appearing for any dmg files I try to download with  
any browser or with curl. BUT the problem is present only on one  
workstation. Other computers on the same network using the same  
interface to the internet do not have the problem. Here is a typical  
hdiutil report for a download of Flip4Mac WM components:
-------
[harvey:~] rpeskin% hdiutil attach /Volumes/Users/rpeskin/Desktop/WM\  
Components\ 2.1.dmg
Checksumming Driver Descriptor Map (DDM : 0)...
      Driver Descriptor Map (DDM : 0): verified   CRC32 $20D8AE53
Checksumming Apple (Apple_partition_map : 1)...
      Apple (Apple_partition_map : 1): verified   CRC32 $423E23CB
Checksumming disk image (Apple_HFS : 2)...
........................................................................ 
......
           disk image (Apple_HFS : 2): calculated CRC32 $065CD088,  
expected   CRC32 $70C682B5
Checksumming  (Apple_Free : 3)...
                     (Apple_Free : 3): verified   CRC32 $00000000
calculated CRC32 $4CD17028, expected   CRC32 $75A11486
hdiutil: attach failed - invalid checksum
-------------------
Where do I look for a solution to this problem?
thanks,
--dick peskin




____________________________________
Richard L. Peskin, RLP Consulting, Londonderry, VT
http://www.rlpcon.com
http://www.caip.rutgers.edu/~peskin