If it fit in length, I would suggest that message;

Questions involving web hosting control panels are off-topic at Server Fault because they customize their systems such that normal administration tools and methods no longer apply, and thus require support from the vendor. It may be asked on Webmasters or see Where can I ask questions about web hosting control panels?

It get the goal of talking about webmaster and it keep both meta post linked, as they give a lot of good informations.

If it fit in length, I would suggest that message;

Questions involving web hosting control panels are off-topic because they customize their systems such that normal administration tools and methods no longer apply, and thus require support from the vendor. They may be asked on Webmasters or see Where can I ask questions about web hosting control panels?

Source:

Questions involving web hosting control panels are off-topic because they [customize their systems such that normal administration tools and methods no longer apply](//meta.serverfault.com/q/8055), and thus require support from the vendor. They may be asked on [Webmasters](//s.tk/webmasters) or see [Where can I ask questions about web hosting control panels?](//meta.serverfault.com/q/8094)

It get the goal of talking about webmaster and it keep both meta post linked, as they give a lot of good informations.