Signature Set Updates Failure To keep your systems protected from the latest threats, NIS must have connectivity to the appropriate update source ( or ) and updated with latest signature sets. NIS will trigger an alert on any failure to update the latest signature set and display a warning on the Forefront TMG management console Alerts tab. When the signatures are up to date, the Update Center appears as follows:: Figure 36: Forefront TMG Update Center NIS will alert if it hasn’t received updates for more than certain number of days. This number is configurable through the NIS Tasks. Select Configure Properties and then select the Definition Updates tab. This threshold is 45 days by default: Figure 37: Threshold for triggering a signatures out of date” alert “NIS The following table lists the possible NIS alerts for signature set updates along with the corresponding troubleshooting steps. The alerts are listed in the Forefront TMG management console Alerts tab. Select the Monitoring node in the left pane to see that tab. Table 3: Troubleshooting signature updates Name Severity Description Troubleshooting #1 Update Failed Error An error occurred Check Forefront TMG during an attempt to connectivity to Microsoft check for, download, Update or install definition Verify WinHTTP proxy updates on the server settings <server-name> Use the error code for further investigation #2 NIS Signature Error NIS failed to load the Take the following steps: Set Loading signature set file on Select the Update Center Failed the server node in the left pane because the Select the NIS entry in the current signature set Definition Updates pane file is missing or is Select Override Current corrupted. Definitions #3 NIS Selected Error The server To stop using the selected Signature Set is configured to signature and start using the Loading Failure use the selected latest released signature, follow signature set <name> these steps: instead of the latest Select the Intrusion signature set retrieved Prevention System node in by Forefront TMG but the left pane NIS will use the latest
Signature Set Updates Failure To keep your systems protected from the latest threats, NIS must have connectivity to the appropriate update source ( or ) and updated with latest signature sets. NIS will trigger an alert on any failure to update the latest signature set and display a warning on the Forefront TMG management console Alerts tab. When the signatures are up to date, the Update Center appears as follows:: Figure 36: Forefront TMG Update Center NIS will alert if it hasn’t received updates for more than certain number of days. This number is configurable through the NIS Tasks. Select Configure Properties and then select the Definition Updates tab. This threshold is 45 days by default: Figure 37: Threshold for triggering a “NIS signatures out of date” alert The following table lists the possible NIS alerts for signature set updates along with the corresponding troubleshooting steps. The alerts are listed in the Forefront TMG management console Alerts tab. Select the Monitoring node in the left pane to see that tab. Table 3: Troubleshooting signature updates Name Severity Description Troubleshooting #1 Update Failed Error An error occurred during an attempt to check for, download, or install definition updates on the server <server-name> Check Forefront TMG connectivity to Microsoft Update Verify WinHTTP proxy settings Use the error code for further investigation #2 NIS Signature Set Loading Failed Error NIS failed to load the signature set file on the server because the current signature set file is missing or is corrupted. Take the following steps: Select the Update Center node in the left pane Select the NIS entry in the Definition Updates pane Select Override Current Definitions #3 NIS Selected Signature Set Loading Failure Error The server is configured to use the selected signature set <name> instead of the latest signature set retrieved by Forefront TMG but NIS will use the latest To stop using the selected signature and start using the latest released signature, follow these steps: Select the Intrusion Prevention System node in the left pane
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