Transmission + Ubuntu - ports closed

[prankstare]

I've been using Transmission v2.82 with Ubuntu and every port I try to open by port forwarding on my router does not seem to work.

Strange thing is I've been testing those same ports on websites such as http://canyouseeme.org / http://yougetsignal.com/tools/open-ports/ and both say ports are open.

Could it be some kind of bug in Transmission software itself? Or maybe ISP doing something to torrent traffic?

[prankstare]

All test results say "Stealth". Does that mean it could be a software bug? Download speeds are still shit compared to when the client reported open.

Could it be that I'm behind a double-NAT or something? If this is the case, then how can I bypass it?

I have tried updating Transmission client to v2.84 but still not working. Have also tried a fresh installment of both the OS and the client itself but to no avail.

[prankstare]

Not using a VPN.

ISP blocking? Could be! But if it is my ISP blocking, then how come http://canyouseem.org/ reports Transmission ports as open while using it?

I'm kind of running out of ideas. Did some research about it and apparently many Transmission users have the same issue.

[prankstare]

Then quit worrying!

https://trac.transmissionbt.com/wiki/SlowSpeeds

Well I'm pretty positive something did happen and it is affecting both download and upload streams.

It was working fine a few days ago!