Symptoms:
In the /var/log/syslog file in NSX Edge, you see message similar to:
/var/log/syslog.1:<27>1 2021-01-27T13:28:58.745138+00:00 lab00775 NSX 8231 LB [nsx@6876 comp="nsx-edge" subcomp="nsx-edge-lb.lb" level="ERROR" errorCode="EDG9999999"] [735c34e3-34e2-4dae-852a-9baaec590e56] upstream sent too big header while reading response header from upstream, client: <IP>, server: , request: "GET /auth/code?code=OanOh4rBqp&state=69707f90-4ba2-4903-af23-85f468124150 HTTP/1.1", upstream: "https://<IP>:0/auth/code?code=OanOh4rBqp&state=69707f90-4ba2-4903-af23-85f468124150", host: "<HOSTNAME>"
Note : Most of the Tanzu applications are showing these symptoms after Tanzu upgrade.