I must be one of the few who tried solo and was beaten each time. At the time I was a level 21 Hunter, so that might explain it. I kept trying the dock warp drive mission (supposedly the easiest) and noticed the orange sola shield on the harder shanks. But not even matching my snipper riffle or rocket launcher to sola had any effect on it. It absorbed everything. Didn't even get to the boss, lol. After 5/6 attempts I gave up. Managed to complete the fallen Boss on his ship mission, with a level 27 player, and picked up a queens chest because of it. I guess there's other guys around 21/22 also having difficulty with them. I'm now on 23 with better armour (a queens chest), but not better guns yet, so might give warp drive another go.