Hi all,
I looked through forums but found nothing. Sorry if someone already speak about it.
I build my mining rig last month and I start mining some altcoins (ltc, dogecoin).
I have three graphic cards Sapphire Radeon R9 280X, 11221-02-40G. According to
https://litecoin.info/Mining_hardware_comparison, the best config for me is : --scrypt --gpu-engine 1050 --gpu-memclock 1500 -I 13 -g 2 --thread-concurrency 8192
I tried many other config and yes it's the best. My hashrate is around 2100-2200 kH/s.
Everything was fine.
Last week, I not have choice and I have to move my rig to another place using a public University connection to Internet. This connection seems to be very restrictive and when I launch mining, it's not work. I have messages like this :
No servers were found that could be used to get work from.
Please check the details from the list below of the servers you have input
Most likely you have input the wrong URL, forgotten to add a port, or have not set up workersI'v tried many things like using a pool with port 80 enabled but nothing work. So I thing about using a VPN and I install
http://www.vpnoneclick.com/ because it's simple and free to test. I'm on Ubuntu. I launch this VPN I then I was able to connect to all pools.
Cool. But now my hashrate is 1100 kH/s and no 2100 kH/s like before. So my question is : Using VPN can reduce hashrate ? I think the answer is no but then what's happen to me ? I use the same config as before.
Thanks for your help and sorry for my english!