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For me it's kind of half and half with uTorrent and Transmission. Sometimes one will work much better than the other. I haven't really found a pattern, but if one is being slow then I just cancel the download and use the other one. FOr whatever reason this seems to work for me even though I'm pretty sure it's not a real solution :D
 
i had the same problem and discovered the solution and the fix was real easy. In my case I use a VPN. In my VPN settings I had to make sure that "port forwarding" was selected, direct VPN to a canada server and then restart mac. I then hovered mouse over the VPN icon at top of desktop where it showed me the port number. I then inputed port number into transmission and BAM the light turned green.

I didn't have to touch any other settings in transmission or router settings
 
foofan....your solution has nothing to do with the original issue of sluggish speeds. If you're using specific ports through a VPN and you don't have those ports enabled you won't get slow speeds sometimes, you'll get NO data throughput at all.
 
actually i was getting very slow speeds, thats why i started looking into a solution. i thought it had to do with router/network settings. while reading other peoples posts, i noticed some said they used a VPN. that made me think it was my VPN too. I hadn't thought of that. I then searched forums for transmission & vpn. Thats where I discovered the issue of not enabling port forwarding in my VPN account, which wasn't selected when i checked my settings. I then followed the VPN's instructions regarding setup, and bam transmission now shows a green light,when it didn't with all the other possible solutions i read about.
 
You had something else going on if you had "slow" speeds or your configuration of the VPN or Transmission wasn't what you thought it was. If a port needs to be open and it's not (or not forwarded), you get NO data, not a little bit of data or data that comes through slowly once in a while. It was using an open port somewhere if you received any data.
 
bottom line is this. the issue was transmission said port is closed with a red light. I never got it to change until i activated port forwarding in VPN settings and inputed the port number from VPN into transmission
 
You had something else going on if you had "slow" speeds or your configuration of the VPN or Transmission wasn't what you thought it was. If a port needs to be open and it's not (or not forwarded), you get NO data, not a little bit of data or data that comes through slowly once in a while. It was using an open port somewhere if you received any data.

FWIW (completely ignoring the VPN conversation, as that is something entirely different) - slow speeds are usually due to the very obvious, the seeders/leechers are rather far away, and not able to seed to you at blazingly fast speeds.

Through a VPN seems kind of silly, all that additional packet overhead.
 
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