Why is ModemManager service taking a long time to restart ?

Solution Verified - Updated -

Issue

  • While rebooting a system, it is taking 3 mins in stop ModemManager service and while booting up it is taking 5 minutes with a message A start job is for the LSB: Bringing up/down networking (2min 2s/5min 8s).
  • Attempting to do a cellular disconnect (through libqmi) on a Sierra Wireless cell modem causes a timeout from the driver.

Environment

  • Red Hat Enterprise Linux(RHEL) 7
  • ModemManager
  • Sierra Wireless modems

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