[Bug]: admin cannot login after fresh install (The form token is not valid)

[injaan]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).

Bug description

I have freshly installed SFTPGo on Ubuntu 22. After setting up the admin user and creating a password for the first time, I attempted to log in to the admin panel. However, when I try to log in with my admin credentials, I encounter the following error: “The form token is not valid”

Steps to reproduce

1. Install SFTPGo on Ubuntu 22.04 using "apt install sftpgo" as root user
2. reverse proxy 8080 to ftp.mydomain.com using nginx
3. access to my domain (my domain is behind cloudflare proxy:https )
4. create an admin user and set the password during the first time setup.
5. Attempt to log in to the admin panel with the created admin credentials.
6. Encounter the “The form token is not valid” error.

Expected behavior

Successful login

SFTPGo version

SFTPGo 2.6.3-cf3e1d3e-2024-11-15T16:58:44Z

Data provider

local

Installation method

Community Deb package

Configuration

no customization

Relevant log output

Nov 23 07:26:21 ubuntu-8gb-hel1-1 sftpgo[8234]: {"level":"debug","time":"2024-11-23T07:26:21.453","sender":"httpd","local_addr":"[::1]:8080","method":"POST","proto":"HTTP/1.1","remote_addr":"[::1]:44714","request_id":"ubuntu-8gb-hel1-1/mT6MWW4Jyg-000001","uri":"http://ftp.mydomain.mn/web/admin/login","user_agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36","resp_status":200,"resp_size":28767,"elapsed_ms":6}
Nov 23 07:26:28 ubuntu-8gb-hel1-1 sftpgo[8234]: {"level":"debug","time":"2024-11-23T07:26:28.443","sender":"httpd","message":"error validating CSRF token IP audience"}
Nov 23 07:26:28 ubuntu-8gb-hel1-1 sftpgo[8234]: {"level":"debug","time":"2024-11-23T07:26:28.445","sender":"httpd","local_addr":"127.0.0.1:8080","method":"POST","proto":"HTTP/1.1","remote_addr":"127.0.0.1:45002","request_id":"ubuntu-8gb-hel1-1/mT6MWW4Jyg-000002","uri":"http://ftp.mydomain.mn/web/admin/login","user_agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36","resp_status":200,"resp_size":28775,"elapsed_ms":3}

What are you using SFTPGo for?

Private user, home usecase (home backup/VPS)

Additional info

No response

[injaan]

I've disabled cloudflare proxy and accessed http protocol and getting still same error