ApplicationConfiguration.SaveToFile() removes "RejectSHA1SignedCertificates"|OPC UA Implementation: Stacks, Tools, and Samples|Forum|OPC Foundation

Hi Team,

We are using Opc.Ua.Core.dll and Opc.Ua.Client.dll ( Version 1.4.354 )  in our application . Our application is targeted to .NET framework 4.6. Basically we have upgraded the OPC foundation SDK from Version 1.3.342  to version 1.04.354.

 Problem :
When we try to communicate our OPC UA client application to any OPC UA server with any security mode ( Basic128Rsa15 , Basic 256 ) We are getting the  error message
“SHA1 signed certificates are not trusted” .

It works fine with NONE security .

based on the reference https://github.com/OPCFoundati.....issues/306,
We have added below nodes under  ‘SecurityConfiguration’ in   our configuration file
  <RejectSHA1SignedCertificates>false</RejectSHA1SignedCertificates>
  <MinimumCertificateKeySize>1024</MinimumCertificateKeySize>

But the ApplicationConfiguration.SaveToFile() function removes the node "RejectSHA1SignedCertificates" from the configuration file .
Could you please advice us any solution for this?

Thanks
Antoni