We have not had an outage in recent memory, and even so that should not affect whether anyone could reach your own site at all. FWIW, I have no problem loading your site from here. :^)
It sounds like either an issue with your Web site hosting server, or possibly an issue with the affected users' connections or ISPs, or maybe even some sort of network routing glitch somewhere along the path across the Internet between your site host and their ISP, which happened to be a common upstream link for both users' ISPs if they're not using the same one.