The OP is asking for a work-around for an issue he has with a host provider. In the specific, the question seems on-topic because
- The OP is using Drupal, and while reporting the issue to the host provider is what I would do, the OP is probably interested to know a work-around that avoid the problem in the short time. I would tell him to report the issue to the host provider, as it is probable they need to change settings, or they already had a similar report and they already know what to do.
- The problem is specific with Drupal, as Drupal uses paths beginning with "admin."
Are such questions on-topic? When those questions stop to be on-topic? If the question is not already listed in the off-topic questions, and it is off-topic, should it be added as example of off-topic question?