---
sourceDocument: Yokohama IT Operations Management
sourceDocumentLink: https://www.servicenow.com/docs/r/yokohama/it-operations-management

 Release :

    - yokohama

ft:locale :

    - en-US

ft:publication_title :

    - Yokohama IT Operations Management

ft:clusterId :

    - itom

bundleId :

    - itom

workflow :

    - Technology


---

# Upgrade issues

# Upgrade issues {#ariaid-title1}

* Release version: Yokohama
* 
* Updated August 11, 2022
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read

What to do when monitors don't work after upgrading synthetic monitoring.

## Condition {#troubleshoot-sm-mid__condition_gr3_jj1_bhc}

After upgrading synthetic monitoring, monitors remain in unknown state.  

## Cause {#troubleshoot-sm-mid__cause_hr3_jj1_bhc}

After upgrading synthetic monitoring, if the monitor is hosted on a MID Server, the server must be restarted to re-recognize the hosted monitors.

## Remedy {#troubleshoot-sm-mid__remedy_ir3_jj1_bhc}

Restart the MID Server. See [Manually start, stop, and restart a MID Server](https://www.servicenow.com/docs/access?context=t_InstallMIDServerAsWinService&version=yokohama&pubname=yokohama-servicenow-platform&ft:locale=en-US).