HTTPS 503 Error

Hi guys,

for one month, we changed our website to https.

so we changed the request link to https, too. 

For example: https://open.mapquestapi.com/nominatim/v1/search.php?key=MY-KEY&format=j...

Now i get this back:

{"fault":{"faultstring":"The Service is temporarily unavailable","detail":{"errorcode":"messaging.adaptors.http.flow.NoActiveTargets"}}}

With http ist not the problem, but i need it with https.

Thanks for help