Upgrade to 2.5.922 removes network settings and cannot put appliance in operational state

Hi,

I am preparing a scenario for appliance upgrade from 2.5.918 to 2.5.922 in order to have all necessary steps in a customer scenario. According to release notes I first must apply OS Patch 310699 and then upgrade to 2.5.920 before I can upgrade to 2.5.922.

Scenario:

1 TPAM appliance (no replicas)

1 DPA

Steps so far:

1. Applied OS Patch 3106991 with appliance in version 2.5.918 - patch applied OK - Could put appliance in Operational mode OK

2. Applied upgrade to 2.5.920 - Patch applied without errors - tried to put into operational mode and got the following errors:

2.1 In /admin interface: System Status/Settings > Cluster Management > Change run level to Operational I get Run Level change encountered an error. And checking the cluster status I get:

Last Refresh (local time): Wed Nov 11 2020 22:31:37 GMT-0500 (Eastern Standard Time)
Failure-The type initializer for 'Quest.PerlWS.WebServices.ClientFactory' threw an exception.

2.2. In /config interface: Network Settings > View Running values

Failure-The type initializer for 'Quest.PerlWS.WebServices.ClientFactory' threw an exception

2.1 In /config interface: Network Settings > Modify Network Settings there is no IP address (blank), no gateway, no MTU size, If I try to put the data and do Save I get:

at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.ParseRootLevelWhitespace()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
at System.Xml.XPath.XPathDocument..ctor(TextReader textReader)
at System.Xml.XPath.XPathDocument.LoadFromReader(XmlReader reader, XmlSpace space)
Network Settings Change Failed
System.Xml.XmlException: Data at the root level is invalid. Line 1, position 1.

Is there a hot fix for this type of error or am I missing something? Any advise is appreciated.

Thank you.