I have a DNN site (v5.00.01) as an intranet and internet site hosted via dynamic dns from my pc in my study.

I have installed the blog module (v3.5.1) and have added an entry (from the intranet) and all is working great. However, when I go to view that blog from the Internet, the permalinks are trying to redirect me to the computer name of the intranet server where the DNN site is hosted (which is not accessible from the internet).  After logging into the site from the internet, I regenerate the permalinks, which now allows me to access the blog entries from the internet, however, this then tries to redirect me to the dyndns name from the intranet (which doesn't work).

Does anyone have any ideas on how to make the same blog accessible from 2 (or more) different domain names?

 I noted some interesting behaviour last week with the blog module..

I was able to EDIT a blog thread from the internet, but I was not able to view that same blog thread by using the "Read More" or thread title links..  However, when I saved the thread, I was then able to view it from the internet, but was unable to view it from the intranet.  Again, editing the thread on the intranet and saving it allowed me to view the thread from the intranet.

Is there a difference in the code behind the Edit and View links which allows the above behaviour ??

 Nigel,

I have both the internal and external URL's in the portal alias table.

When you say that you are able to edit /add blogs regardless of the site, are you accessing your site from outside your domain?  Are you logged into your DNN site at the time?