It sounds like your authorization file on your IDSM has been corrupted.
The authorization file on the IDSM should list the hostname of the IDSM itself
as having GET authorization which is needed for the show ip traffic command.
If you are using Unix Director then you can select the IDSM within nrConfigure and look under the system folder. There should be a configuration for the authorizations. Ensure that the IDSM itself is listed and has all authorizations.
If you are using CSPM then it creates the authorizations file itself. So just try pushing a new configuration from CSPM.
In a worst case scenario, try running setup on the module to re-intialize all of the configuration files (NOTE: This will remove all of your previous edits so do this only as a last resort). Then try show ip traffic and see if it is working.
If it is wokring then try pushing the last good config from CSPM or Unix Director. Try show ip traffic again. If it keeps working then you are good to go, but if it stops working then there is something wrong in the configuration being pushed from CSPM/Unix Director.
NOTE: If you've changed hostid, orgid, hostname, or orgname for the sensor through CSPM or Unix Director then that could be the cause for a corrupted authorization file if it was not properly sync'd with the new names.
