Having loads of fun here, so close yet so far!

Set up and ifolder only server on nw65sp3 on the internal network behind a BM3.8 firewall. I can load the lfolder client internally and connect via port 80 or 443 without issue. Everythign syncs fine. I loaded the client on a remote users PC and when I try to connect I get the following error.

Unable to connect to server (-105).

If I use a web browser from the same PC (or internal) via https://<serveraddress>/iFolder I get the ifolder webpage and can download the client. If I click the login link I get the following error

Object not found!
The requested URL was not found on this server. The link on the referring page seems to be wrong or outdated. Please inform the author of that page about the error.
If you think this is a server error, please contact the webmaster.
Error 404

I noticed that the login link points to https://<serveripaddress>/NetStorage , is this goofed? This doesn't explain why the client though works internally and not externally.

Points of note from the external PC testing.

Cannot connect via port 80 in anyway shape or form, not client or web interface
Can connect to the ifolder webpage via 443 but cannot login, link ( I assume is incorrect) redirecting to netstorage

I've check the BM filtering and it seems ok, I've traced it from one end to the other and cannot see an issue as to why it wouldn't be working?

Any suggestions?