HTTP 403 Forbidden when going through LB

Products

• Clarity PPM On Premise
• Clarity PPM SaaS

Issue/Introduction

Some scenarios below:

• After migration to MS Azure, we are able to connect directly to Clarity server but not via load balancer (LB).
• We are getting error pop-up: [en - Unable to process request - Server or Network error]
• In Dev Tools we can see error HTTP 403 Forbidden
• This can manifest with other setups - on premise and with other cloud vendors such as AWS or Google Cloud
• There can be issues working with Modern UX. Logging into it, updating instances etc.
• Browser trace shows POST requests getting blocked

Resolution

• The issue is not with Clarity product but with Azure/Network configuration, which out of scope for support
• Our suggestion would be to work with Microsoft Support and IT team to use wireshark or similar to trace where exactly (at which layer) the HTTP 403 is thrown
• Check load balancer logs.