v16 Unable to resolve FTP site address

I just installed v16 on one of my laptop systems and imported the v15 CSV profiles from my desktop, as a test I'm trying some of my sites and on the v16 system I get an error "Unable to resolve "ftp://instructor.xxxx.xxx" [11001]." The same profile on my system with v15 works. I looked in the help file

1. Where are the error codes located in the help file?
2. How do you perform a search in the help file?