Having incorrect Regional settings on the server can cause various errors in the web interface and in the product logs (any product) with errors referencing invalid Int32 strings, invalid input string, and/or invalid DateTime entries.
This issue is caused when Windows servers is/are using non-US regional settings, or using date formats set to: dd MMMM yyyy.
An example of this is having regional settings set to "English (United Kingdom)".
All products require that the Regional Settings on the server be set to US Regional settings with the proper sShortDate and sLongDate settings in the registry.
Windows Server
Any of the NetQoS Products
Follow the steps below:
sLongDate = dddd, MMMM dd, yyyy
sShortDate = M/d/yyyy
sLanguage: ENU
Locale: 00000409
LocaleName: en-US
sCountry: United States
sDecimal: .
You might also reference this site for any further registry changes that need to be made to resolve errors. The above steps should be all that is needed in most cases:
https://www.itprotoday.com/windows-8/jsi-tip-0311-regional-settings-registry