This error can happen only in DC++ 0.699 and older as from 0.700 and on resume and integrity check is done in another way.
This message means that somehow the data has become corrupted during a transfer. Usually it's because one of the users, either you or the one you are downloading from, is using a bad firewall, such as Zone Alarm, which is intercepting some packets. There are three things you can try to fix the problem:
- You can attempt to fix the file by chopping off the rollback bytes, using a tool like cutoff.
- Delete the file and re-download it.
- Completely disable the rollback feature by changing the value in Settings -> Advanced to 0. You can do this, but at your own risk. The rollback is a scheme to ensure that the file you're resuming and the file you're downloading from a remote source are the same. If you disable it after getting the rollback inconsistency message, there will be corruption.
DC++ Change Log Related Entries:
0.706: Removed unused rollback option (thanks mikejj)
0.700: Removed rollback support - advanced TTH resume is now always used (thanks cologic)
0.669: Added advanced resume that detects and tries to repair rollback inconsistencies using tiger trees
0.4033: Fixed a memory leak with rollback buffers under certain conditions
0.4032: Sources with rollback errors are now automatically removed (thanks, garg)
0.307: Rollback no longer depends on buffer size
0.173: Changed the way rollback works; it is now more tightly integrated with write buffer size
0.16: Improved rollback buffering
0.153: Fixed a rollback bug
0.15: Fixed a small error with the rollback
0.14: Added rollback size option
0.13: More work on the resume rollback, it should now work a bit better
0.121: Fixed rollback bug