we’ve noticed today that our website (www.weh.de) is not available with certain internet provides. We’re getting a 403 code. For example in Germany with Telekom D2 network and O2. While trying to access it from other providers like Vodafone and Telekom D1 it’s working as expected.
Other websites are hosted on the same server and they are accesible. How can this be fixed?
For example (with Congstar provider):