cisco freeradius problems

[Edgars Makņa]

Hello
I have interesting problems with freeradius authentication.
NAS - cisco 2801
radius - freeradius running on freebsd with mysql db.
I had a lot of such errors in radius.log:
Auth: Login incorrect (rlm_pap: CRYPT password check failed): 
[1-102/D\014\003\222\374\267<z\013y\005\200\354S\373\344] (from client 
plaza port 0)
In debug output i get "unprintable characters". In the same time 
authentication was working fine from other hosts, for example smtp server.
Problem was solved in interesting way, on cisco i specified radius 
source interface. It was working fine until mysql server crashed and i got
same garbage in authentication. I removed source radius interface from 
cisco configuration and everything started to work fine again.
Any ideas?