Thanks Charlie,
Here is the detail I hope you are looking for. After Update 2 on 5.6unsupported I could no longer ping my main domain on the SME server itself. The virtual domain was fine....could ping fine. The main domain came back with host unknown error message. This was on the SME server itself. Clients behind the SME could not get to the main server by the domain name. Virtual Domain was fine.
I have it working now but would like to know if I may have caused other issues. I copied the db.maindomain.com file in /home/dns/var/named directory and the db.maindomain.com.jnl file to something else then deleted both files. I then ran a post-upgrade again and rebooted. Now a new db.maindomain.com file has been created but no .jnl file. Now I can ping my main domain again, also proxy, www, mail, etc. I am not sure what the .jnl file is for.
Thanks for any assistance.
Ron