I have 10 OES 6.5 with Mcafee Netshield 4.62.
My firewall is able to permit ftp connections.
All the servers when trying to run the Automatic DAT update failed.
The messages in the activiti.txt log are:

"Try Passive FTP to ftp.nai.com
doFTP could not read files "update.ini" in target directory pub/antivirus/datfiles/4.x
Try Active FTP to ftp.nai.com
doFTP could not read files "update.ini" in target directory pub/antivirus/datfiles/4.x
AutoUpdate FTP communication error in obtaining file."

Any idea?