New UX Error - An Error Cccurred While Saving Preferences

Products

• Clarity PPM On Premise

Issue/Introduction

Windows application servers are load balanced. 

The error comes up when updating Project module:
An error occurred while saving preferences

The New UX works fine on all except one of the servers.

Environment

Clarity 15.9.3, 16.0.0

Resolution

In one case study, the HAR file produced shows:

Request Header:
PUT /ppm/rest/v1/private/personalizations/5041003 HTTP/1.1

Response Header:
HTTP/1.1 405 Method Not Allowed
Allow: GET, HEAD, OPTIONS, TRACE

Contact the internal network/server team to review HAR file/error.

It only allows the following functions: GET, HEAD, OPTIONS, TRACE,
but not PUT.

Review the HAR file produced from each node, bypassing the load balancer.

Compared servers in the Server Configuration Wizard.
The Add Roles and Features Wizard showed differences between the servers, therefore the selected settings need to match that of the working server.

Example: