This is probably an ISP content filter. Those are not unusual. A network traceroute from the ISP network will generally show a block pretty quickly, if this is the ISP. This as compared to a traceroute to some other site through the same ISP. These blocks can be in the ISP network, or in the ISP router.
This can also be a DNS-level block. Some DNS providers implement that. Switching to a different DNS server can usually identify that.
Depending on the exact error or diagnostic being reported—a detail not yet indicated here—this can also be other issues, such as a compromised web site.
This could also be a block at the remote site, such as a country-level block. This if the ISP change also changed the country of origin for the IP address. IP address locations are problematic at best. State and city are routinely wrong. Country of origin is usually right, though sometimes not even that.
QuickPost wrote:
I am sorry, this post is not appropriate for Apple Support Communities.
Adult content comprises a wide variety of materials, and the definitions here are contentious at best.
Apple offers third-party products containing adult content for sale, where that is permissible.
There are threads—one an ~hour ago—with access to and purchasing that Apple-offered third-party content, too.
Posting links to or examples of that content here is certainly not permissible, as this site is not Adult-restricted.
This is also far from the first discussion of ISP network filtering, both ISP-initiated and related to regulatory compliance.
As level 6+, you (QuickPost) have additional options for asking Apple about these topics, too.