The FlexSim GIS servers are still under maintenance. As of right now, they are not up.
The OSRM demo server's usage policy states:
Note: the demo server usage is restricted to reasonable, non-commercial use-cases. Do not exceed 1 request per second. We provide no guarantees wrt. uptime, latency, or data updates.
https://github.com/Project-OSRM/osrm-backend/wiki/Demo-server
The OSRM routing server seems to be working fine from my machine right now. Perhaps the server has throttled or blocked your system for making too many requests, or maybe it was down or busy when you last tested it.
Phil BoBo
Sr. Manager, Software Development