Sandvox: Only reachable within local network

I have several Mac Minis using several OS (10.7.2-Intel Core 2 Duo, 10.8.5-Intel Core i5, 10.5.8-Power PC, 10.9.5-Intel Core i5, 10.6.8-Intel Core 2 Duo). I am using serving pages from all and built the sites using Sandvox. Until a couple of weeks ago everything was running fine. Also using DynDNS. Recently i modified some info on several and now Sandvox replies:

Only reachable within local network

Every pertinent port in the router is open… internally the page is webserved…

help!

thank you for your time and knowledge