A small background on the issue: We have a two sites working under Cloudflare, they have a small amount of differences within the configuration. Let’s name them “domain1.com and domain2.com”. Both are hosted under the same hosting with the same dedicated IP.
domain1.com uses Cloudflare Nameservers but nothing else. This is due to issues in the past and decisions through time. So in the end the site is being served by the hosting itself instead of Cloudflare. Only Nameservers are being used.
domain2.com fully uses Cloudflare. So this site is actually being served by Cloudflare.
We talked with our ISP and the site/ip facing the issue is not being blocked, also we talked with our hosting provider and they are not blocking the site/ip either. So our last place to address the issue is on Cloudflare and see if we get the help on figuring out what’s really happening. Inside the facilities where the site is not being accessible, there is nothing blocking the site either.
Could this be an issue due to Nameservers? The last time we changed the Nameservers was close to 3 years ago and the issue came up just a few weeks ago.
Thanks a lot for all the help.