I prepared a Conflunce 6.6.0 instance as documented:

• SSL certificate from Let's Encrypt
• Nginx reverse proxy and ASK termination
• Confluence plugins
• VPN access
• test with mobile Chrome successful

Now I tried the app and entered the site, user and password. The circle turn and nothing is happen. With an invalid password the known error message comes back.

I checked the logs and had no idea how can I identify relevant log lines. Nginx print a 302 http code in access log and nothing else.

Please give me a hint how I can find out why it's not working.