NSX L7 HTTP Virtual Server uses HTTP 1.0 to the Server Pool even though client requests are HTTP 1.1

Products

• VMware NSX

Issue/Introduction

• NSX Data Center Load Balancer.
• Client requests to the L7 HTTP Virtual Server use HTTP/v1.1.
• Requests to the Server Pool members are HTTP/v1.0.
• For Server Pool members that require HTTP/v1.1, the LB may not work as expected.
• "Upgrade Required" error may be seen within the browser when accessing the VIP IP, this denotes the need for http 1.1 to pool members.

Environment

VMware NSX-T Data Center
VMware NSX

Cause

NSX-T L7 HTTP Virtual Server uses HTTP/v1.0 to forward the requests to associated Server Pool members. This is the default behavior of NSX-T Load Balancer.

Resolution

This is known behaviour of the NSX-T Data Center Load Balancer.

Workaround:
To use HTTP/v1.1 for communication to the pool members, enable TCP Multiplexing on Server Pools Additional Properties:

1. Login to NSX UI 
2. Click Networking tab
3. Under Network Services, Click Load Balancing
4. Click Server Pools tab
5. Scroll to the target Server Pool
6. Click on the ellipsis beside it and click edit
7. Expand Additional Properties
8. Enable TCP Multiplexing
9. Click Save