[Solaris] rsync unexpected EOF in read_timeout

Hi all,

i'm trying to rsync directories from server A to server B
ssh works perfect without keys, scp also works, but when executing the rsync command i get the following error:
permission denied
unexpected EOF in read_timeout

Command is:

rsync -avzn ${LOCAL_DIR} --include-from=${INCLUDE_FILES} robin@caxs026:${REMOTE_DIR}

Server A = SunOS 5.8 Generic_Virtual sun4u sparc SUNW,SPARC-Enterprise
Server B = SunOS 5.10 Generic_150400-13 sun4u sparc SUNW,SPARC-Enterprise

I've googled a lot of sites, but can't seem to find the correct answer. Hoping you can help me out

Doing a truss -f -p on the sshd pid on the target machine may help to pinpoint the problem. Things to check: Is rsync really using scp and not rcp? Is rsync executable for user robin on the target machine?