The forum has been alive for a couple of years with no issues. We get about 2k pageviews per day from about 100 unique users.
After an upgrade a couple of weeks ago, I started to get emails from users saying they can’t access the site. I have many users that are still able to access the site. The users with the issues are coming from different ISPs. They’ve cleared DNS cache. They’ve changed browsers.
What questions should I be asking to help troubleshoot the issue?