Unexpected Service Response

Hello All!

We have multiple Solaris 10 boxes that run both FTP and SMTP.

I have xymon configrued to test these ports (ftp and smtp) but the tests
show up as

"Service ftp on XXXXX is not OK : Unexpected service response"

and then immediately it goes green with

"Service ftp on XXXXXis OK (up)"

What would be a good starting point in determining why this is happening. I
have the same ftp and smptp tests being performed on Linux and AIX boxes
with no issues but this happens on ALL of my Solaris 10 machines...

Any help is appreciated!!!