Hi,
I downloaded the Transmission torrent package through Synocommunity (it's the only torrent package for Synology NAS I know). It works great on the download but on the upload, the site I use is dimeadozen.org and is telling me the port 9091 is : protocol error 1no/erroneous BT client listening or misconfigured router. My router says it's open, open port checker says it's open so I am guessing there is an issue with the configuration of my NAS. Any help would be greatly appreciated.

Same problem with Downlod Station (that’s also transmission engine torrent client)?

Yes, with Download Station, I get this error from Dime a Dozen:

I figured it out. My router had Upnp activated and my client did not. I deactivated Upnp on my router and all is good.

Having upnp nowdays is a bit dangerous. Gald you got it working,

Thanks Rusty!