Port Forwarding to view a web-page that isn't on a...

Question

I have port forwarding set up to access certain services at home, which works fine using my home hub, with the exception of one thing. I'm trying to use a url like the one below, in order that I can gain access to a web page which is on a web-server on a machine in my network that operates on a different port to normal (normal being port 80 or 443 here since this is https):
https://hostname.dyndns.org:1234/service-name
within my home network, I use the following address in a browser and it works fine:
123.123.1.123:1234/service-name
Now I have the port forward application set up on the home hub 3 with the ports set to forward 1234 to 1234 and I have assigned this to the correct machine (i've tried assigning by IP addess and also tried changing the forwarding rule to '1232 to 1234' and amending my url appropriately.
Unfortunately nothing I have tried is working.
uPnP is turned off as most of the machines I want to access are on static IP's. (I couldn't assign forwarding rules to the static IP machines with it on).
Could anyone shed any light on this?
thanks in advance.
btw, uPnP is turned off as most of the machines I want to access are on static IP's.
(I do have a work around by using RDP to another machine and then opening the url using the target machines ip address in the remotely controlled machines browser, but it's far, far from ideal).
Solved!
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Answer 1

I am not sure you have that quite right on DynDNS, as you have to use two host names, and a webhop to link the two.
Here is a live example of what I used to have.
Mt current webserver works on port 80, which is fine.
My host address is http://forumhelp.dyndns.info which points to the machine on my LAN, which has port 80 forwarded to it.
Prior to the current arrangement, I had a webserver running from a NAS device on port 8100.
To ensure that incoming web requests appeared on the standard port, I had to create an additional similar host name, and then create a webhop within DynDNS to do the redirect.
The web address on the Internet stiil be the same, but would  webhop to http://dummyhost.dyndns.org:8100/
Have you checked using one of the many port checking websites to see if port 1234 is open?
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.