Issue appears while executing the backup using omnib, as well as GUI will popup the same messages while assessing its functions like devices, backup specificaion...
# omnib -datalist backupspecification
Time out occurred.
Customer install DP along with Performance Center so we found out that hang occurs during ARM api call(arm_init). This is 3rd party library/code and it does not do much as far as DP session managers are concerned.
Note: ARM was used to display performance graphs through HP Performance Manager and it was obsolete with DP 6.20. There is also a plan for it to be removed from DP in the future releases
Set OB2DISABLEARM=1 to omnirc of Cell Manager to disable this call.