Thank you for reading this post! Here's a description of the issue we're facing.
We have a multisite network running ~70 subdomain sites. The sites have all been running fine for the past year and a half. The primary site is mnknights.org, and each subsite is e.g. kc9139.mnknights.org.
We recently switched the domain nameserver and SSL configuration (Let's Encrypt rate limits were causing issues as the network grew past 50 subsites). The switch went fine, and both the primary domain site, and the subsites, continued working – smooth launch! However, we have noticed today that about ~50% of the subsites are not working correctly.
There have been two different errors we've been getting:
1) This site can't be reached. kc4842's server IP address could not be found.
2) Siteground (hosting company) error "Oops! Website currently not available."
For , we have double-checked the DNS domain settings, and are stumped. We do have correctly setup a wildcard A record *.mnknights.org that points to the correct hosting server IP address. However for some reason the browser/internet is not recognizing the wildcard A record? This record has not been changed recently.
Why is kc4842.mnknights.org not being recognized as an IP address?
For , we have double-checked the multisite settings, cleared the site caches, verified that the actual WP subsite files and database values are still in place (they are), and checked the wp-config and htaccess files (nothing unusual that we can find).
Does anyone have any ideas as to what could be going on? We're at wit's end trying to figure this out, and meanwhile half of our network is out :slight_frown:
Thank you for your help! Peace