Hi!
This error occurs when PuTTY decrypts an SSH packet and its checksum is not correct. This probably means something has gone wrong in the encryption or decryption process. It's difficult to tell from this error message whether the problem is in the client or in the server.
Try with different settings on Putty, disable/enable SSH on router and maybe it will work.
Under Putty check SSH settings. This error happens usually with SSH 1 + Blowfish encryption.
Good luck!
Calin
