Site Builder 2.13 cannot access some parts.

[poscompo]

Hi

I have an almost working SB on RHES3.

I can access the wizard and the admin from sitebuilder.domain.com, but when I come to publish it looks to sitebuilder.servername.com to publish. I cannot access SB from sitebuilder.servername.com from there or from the web. Is is sitebuilder.comf that is wrong, or an incorrect dns?

Thanks

Richard