Look at Command prompt window: You are Connected to ultra.nitro.org instead of ultra2.nitro.org :-)

Use: stratum+tcp://ultra2.nitro.org:4337 -u your.worker -p your.password

It wouldn't matter anyway, his hashrate is twice what a 7950 can get.  And he uses a g-1 thread on a g-2 card with too high intensity.  He's getting all HW errors if more of the mining screen could be seen.