This is an issue which has confused me for a very long time, and every time I try figuring it out again, I get trapped in the abbreviations and terminology.

To be honest, I really don't need to understand it, just ensure that it's set properly on my iMac.

I suspect that some of the lack of seeding I'm doing is a result of poor or inefficient or non-at-all port forwarding, but I'm not even sure of that.

Every time I open Transmission, which I use for many of my torrents, and look at the Preferences > Network window, I see the "Peer listening port:" with a number, and then a red button beside it with the note "Port is closed"

I have both the boxes underneath, "Randomize port on launch" and "Automatically map port" checked.

Even if I click the "Randomize" button, I get a new number but still that closed indication.

Could someone walk me through this procedure without explanation if possible, and just give me a step by step procedure I should follow?

I also use Transmission and have no problems.

Snapshot for Preferences/Bandwith and Preferences/Network below

This may help. https://trac.transmi...wiki/PortClosed

PreviewScreenSnapz001.tiff

Here try this, it is a simple port forward tester which will tell you which ports are open

http://www.pcwintech.com/simple-port-tester

I also use Transmission and have no problems.

Snapshot for Preferences/Bandwith and Preferences/Network below

This may help. https://trac.transmi...wiki/PortClosed

PreviewScreenSnapz001.tiff

Thanks. I managed to follow the information in that url and at least I do now have an open port, and immediately Transmission began uploading.

Does this mean that I should NOT have the Randomize port on launch box checked?

And does this also mean that I should go through the full procedure again if I do a restart and therefore a new internet connection, probably with a new address?

Is there a significant difference between TCP and UDP? I don't know what they are, but the port tester seems to differentiate.

And another question, as I couldn't edit my earlier post:

Should I do something similar for uTorrent, which I use for some torrents, but is banned (or at least not appreciated) on some trackers like TheBox?

Haven't seen any problems with it, but .....?

I also use Transmission and have no problems.

Snapshot for Preferences/Bandwith and Preferences/Network below

This may help. https://trac.transmi...wiki/PortClosed

PreviewScreenSnapz001.tiff

Thanks. I managed to follow the information in that url and at least I do now have an open port, and immediately Transmission began uploading.

Does this mean that I should NOT have the Randomize port on launch box checked?

No

And does this also mean that I should go through the full procedure again if I do a restart and therefore a new internet connection, probably with a new address?

No, Transmission will remember the settings

Is there a significant difference between TCP and UDP? I don't know what they are, but the port tester seems to differentiate.

TCP and UDP often use the same ports but not always. Read about it at http://en.wikipedia....DP_port_numbers

And another question, as I couldn't edit my earlier post:

Should I do something similar for uTorrent, which I use for some torrents, but is banned (or at least not appreciated) on some trackers like TheBox?

Haven't seen any problems with it, but .....?

Sorry I don't use uTorrent and I am not familiar with the program

Review the forums at the link I posted and the answer to all your questions should be there, if not, join and post

http://forums.pcwintech.com/