Maybe it is a problem with my Frontpage Server Extensions.
I wasn't particularly clear on my initial message. My ISP is only providing the DNS entries for a static IP address assigned to the domains and sub-domain. In other words, my ISP is mapping the domain name and the subdomains (i.e. CNAMES) on their DNS server, however the physical webserver with the FPSE is here with me.
Is it odd that I can publish to the webserver using an IP address, yet I can't publish using the domain name (i.e. website.com)? Do y'all normally publish to a domain name? In the past I've always published to IP addresses. Now that I'm attempting to publish to subdomains (i.e. subdomain.website.com) that are on the same IP address as my domain name (website.com) I've bumped into this problem for the first time.
Come to think of it, I do not believe this is an FPSE problem. I have all of the subdomain contents working in subsites to website.com (i.e website.com\subdomain\default.asp). I can publish all of these subsites because I publish the root site in FP and check the box to publish all subsites. Seems to me the problem is either that this is standard operating procedure (Frontpage can't publish to domain names - it can only publish to server names or IP addresses); or I've got some kind of security block on my local webserver that allows publishing to the IP address but blocks publishing to the domain name.