Issue: The information following the colon in the message is information from the WMS server and may help you analyze the problem. You may see this message after accessing a WMS server while seeing a list of WMS layers.
Fix: The server you are accessing may not be a WMS server. This can occur because the Capabilities document provided by the server may contain additional URLs that redirect you to another server (not the one you explicitly selected). That redirected server may be unavailable or have a problem.