GQI DxM unavailable because of missing Newtonsoft.Json assembly

Affected versions

DataMiner web 10.5.0 [CU1]/10.5.4 or higher.

This issue only occurs after direct upgrades from DataMiner web 10.5.0 [CU0], 10.5.2, or 10.5.3 to higher versions. Any subsequent upgrade to a newer version of DataMiner will resolve the issue.

Cause

The Newtonsoft NuGet dependency was downgraded in GQI version 1.0.18 (included in DataMiner web 10.5.0 [CU1]/10.5.4) in order to go from a direct reference to a transitive dependency when SLNetTypes was added as a NuGet in that GQI version. However, during MSI installation, the newer assembly will be removed while the older assembly will not be placed in the install location. As a result, after an upgrade to the affected versions, the assembly will not be present, and the GQI service will be unavailable.

Fix

Install DataMiner 10.5.0 [CU15]/10.6.0 [CU3]/10.6.6.

Workaround

Repair the DataMiner GQI service by running the DataMiner GQI MSI located in the folder C:\Skyline DataMiner\Tools\ModuleInstallers\Web, or run a recent DataMiner upgrade that contains a GQI version that is different from the currently installed version.

Description

In the DataMiner web apps, the GQI DxM is unavailable. The GQI logging contains a message stating Could not load file or assembly 'Newtonsoft.Json'.