Multi-Domains Warning

Hi,

I have the multi-domains plugin and it is working beautifully. I have 2 additional domains and as far as I can see all is well.

But I have a warning: Warning! Wildcard DNS for craftblog.ie may not be configured correctly!
Unable to contact the random hostname (5c5ca1.craftblog.ie).

So I know where the error came from, I installed the plugin and added the first domain (craftblog.ie) before I had the wildcard subdomains enabled. I then got wildcard subdomains enabled on the two new domains, and went back to the plugin and added the 2nd domain without issue, but the warning from the first domain remains.

So my question is, is there a way to get rid of this warning?

Thanks.