Sorry I do not know whom to sent this, may be you can re-dirent to the ight person. I distributed rdist passwd + shadow file from my server running 6.1 i386 to Sparc 10 running 6.0. I have checked all files are identical, but could not login into Sparc with 6.0. I had to set root passwd to nothing and rdist to sparc to log in and then "passwd user" for each user on sparc. DO 6.0 AND 6.1 USE DIFFRENT ENCREPTION ALGORITHMS? OR IS THIS A BUG??? Regards, Ivan.
By any chance, are you using "normal" passwords on one box, and MD5 hashes on the other?
The problem was most likely that MD5 had endian-ness issues; this was fixed in 6.1.