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The drop-down menu is blank and nothing can be selected or typed manually in the trigger conditions after editing an existing alerts in web alerts.
NPM 11.5.0 or later
This may be because of issues with schema in swis.
Another resolution is Resetting the IIS:
1. From the Orion server, open the command prompt as administrator
2. Type "iisreset"
There is a post in SolarWinds thwack about this issue and resetting IIS via command prompt resolved it. Please see the link below:
Note: You may also need to clear the ASP .NET cache as well. See https://support.solarwinds.com/Success_Center/Troubleshooting_Tools/Orion_Core_Troubleshooting_Guide_-_Website_Performance/Other_Time_is_High/How_to_Clear_.Net_Cache_Manually