Communication problem with rsync-2.6.0

[fiver at interia.pl]

hello, 

 I have a following problem while using rsync:

rsync: connection unexpectedly closed (0 bytes read so far)
rsync error: error in rsync protocol data stream (code 12) at io.c(189)

it was coused by command rsync -r source/ dest/ -e rsh

I use rsync-2.6.0 with rsh. What bothers me is that folowing problem apears 
time to time. I already checked the location of rsync on both machines, both /usr/bin/rsync.
I work on solaris-2.8-sparc(remote) and Linux ### 2.4.22-1-686 GNU/Linux(server).

could you please help me?

thx in advance,

Fiver