Are you working on requirement 6.5.10?
LEM is mostly just basic Linux under the hood so perhaps this guide would be of some assistance? Don't know offhand if they do anything unusual that would interfere with this but this explains how to set timeouts in Linux.
Support can get you into root on the appliance but they will probably give you some disclaimers about anything you break is yours to fix, so make sure you take a snapshot before.
Loop1 Systems: SolarWinds Training and Professional Services
Thanks for the suggestion however we have limited access on Linux shell of our LEM appliance (6.1.0) only Solarwinds support can perform SSH. I would not raise this question if I could be able to do that because all other systems running in our production environment aside from LEM already comply with that PCI-DSS requirement.
Are you talking about accessing CMC from SSH? Or from the virtual appliance console in Hyper-V or VMware?