Most subdomains of my website are behind Cloudflare (orange cloud), a few subdomains are not (grey cloud).
Now, users on the salt.ch network (mobile and fiber) can’t access the subdomains with the orange cloud. Grey cloud subdomains work fine. This is almost certainly an issue by salt and not by Cloudflare. Users on the salt network can access other websites that are hosted through Cloudflare, examples include: handelsblatt, 9gag, medium and codepen.
So far, salt hasn’t replied with anything helpful, they state that they block access to the website due to some new Swiss law. In one ticket they mention it could be related to sharing the same IP with a website that is related to gambling, but in the latest reply they just mention there is not fix from their side and don’t mention any shared IPs anymore. Well if you use a CDN or cloud services, it is expected that IPs are shared.
Especially interesting is that other Swiss providers still allow access to my website, no other provider is known to block access. (BTW: my website doesn’t feature any “adult content”, “gambling”, or anything remotely illegal or not suitable for children etc.).
Well this all sounds quite dodgy, I know. But I was wondering if anyone is experiencing similar issues or if there are possible fixes to this? Would it be possible to for example change the zone of my website in Cloudflare to get different IP ranges (not sure if this is related at all, I am just guessing…)?
BTW: this post might be related to this one - Site unreachable from specific mobile provider - but in the end it was mostly about AT&T and seems fixed, so I think it’s something else.