TOO_MANY_REDIRECTS when reverse_proxy to PVE that runs Caddy

Help
1

1. The problem I’m having:

Hi. Have been running Caddy for years for servers like HomeAssistant without issues, but not come across this scenario before and not sure how to fix. I recently moved to Proxmox to host my servers - I have Caddy running here in a LXC. I want to access my Proxmox VE over SSL from outside my network. I have a very simple Caddyfile which works perfectly for about 4 other servers but when I follow the same process for my PVE’s IP address, my browser shows a TOO_MANY_REDIRECTS error. I’m a novice and can’t understand why it is getting tripped up - I guess it has something to do with Proxmox already using it’s own self-signed certificate (which most browsers mark as insecure).

2. Error messages and/or full log output:

This page isn’t working
pve-01.mydomain.com redirected you too many times.

Try deleting your cookies.
ERR_TOO_MANY_REDIRECTS

3. Caddy version:

v2.10.0

4. How I installed and ran Caddy:

a. System environment:

Proxmox LXC running on Debian. AMD64

b. Command:

I used a community script

c. Service/unit/compose file:

systemd

d. My complete Caddy config:

homeassistant.mydomain.com {
        reverse_proxy 192.168.1.9:8123
}

tasmoadmin.mydomain.com {
        reverse_proxy 192.168.1.9:9541
}

blueiris.mydomain.com {
        reverse_proxy 192.168.1.3:3369
}

pve-01.mydomain.com {
        reverse_proxy 192.168.1.2:8006
}

My Proxmox VE is running on 192.168.1.2
Caddy server is running on 192.168.1.6

5. Links to relevant resources:

2

Run the following command and share its output:

curl -Lvk --max-redirs 3 URL_YOU_HAVE_PROBLEM_WITH
3

Hey. Thanks so much for your interest and help…

root@caddy:~# curl -Lvk --max-redirs 3 pve-01.mydomain.com
*   Trying 111.222.60.148:80...
* Connected to pve-01.mydomain.com (aaa.bbb.60.148) port 80 (#0)
> GET / HTTP/1.1
> Host: pve-01.mydomain.com
> User-Agent: curl/7.88.1
> Accept: */*
> 
< HTTP/1.1 308 Permanent Redirect
< Connection: close
< Location: https://pve-01.mydomain.com/
< Server: Caddy
< Date: Sun, 29 Jun 2025 04:04:58 GMT
< Content-Length: 0
< 
* Closing connection 0
* Clear auth, redirects to port from 80 to 443
* Issue another request to this URL: 'https://pve-01.mydomain.com/'
*   Trying 111.222.60.148:443...
* Connected to pve-01.mydomain.com (111.222.60.148) port 443 (#1)
* ALPN: offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=pve-01.mydomain.com
*  start date: Jun 28 04:48:08 2025 GMT
*  expire date: Sep 26 04:48:07 2025 GMT
*  issuer: C=US; O=Let's Encrypt; CN=E6
*  SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
* using HTTP/2
* h2h3 [:method: GET]
* h2h3 [:path: /]
* h2h3 [:scheme: https]
* h2h3 [:authority: pve-01.mydomain.com]
* h2h3 [user-agent: curl/7.88.1]
* h2h3 [accept: */*]
* Using Stream ID: 1 (easy handle 0x5b231a0837a0)
> GET / HTTP/2
> Host: pve-01.mydomain.com
> user-agent: curl/7.88.1
> accept: */*
> 
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
< HTTP/2 301 
< alt-svc: h3=":443"; ma=2592000
< cache-control: max-age=0
< date: Sun, 29 Jun 2025 04:04:58 GMT
< expires: Sun, 29 Jun 2025 04:04:58 GMT
< location: https://pve-01.mydomain.com/
< pragma: no-cache
< server: pve-api-daemon/3.0
< via: 1.1 Caddy
< content-type: text/plain; charset=utf-8
< content-length: 17
< 
* Ignoring the response-body
* Connection #1 to host pve-01.mydomain.com left intact
* Issue another request to this URL: 'https://pve-01.mydomain.com/'
* Found bundle for host: 0x5b231a07fee0 [can multiplex]
* Re-using existing connection #1 with host pve-01.mydomain.com
* h2h3 [:method: GET]
* h2h3 [:path: /]
* h2h3 [:scheme: https]
* h2h3 [:authority: pve-01.mydomain.com]
* h2h3 [user-agent: curl/7.88.1]
* h2h3 [accept: */*]
* Using Stream ID: 3 (easy handle 0x5b231a0837a0)
> GET / HTTP/2
> Host: pve-01.mydomain.com
> user-agent: curl/7.88.1
> accept: */*
> 
< HTTP/2 301 
< alt-svc: h3=":443"; ma=2592000
< cache-control: max-age=0
< date: Sun, 29 Jun 2025 04:04:58 GMT
< expires: Sun, 29 Jun 2025 04:04:58 GMT
< location: https://pve-01.mydomain.com/
< pragma: no-cache
< server: pve-api-daemon/3.0
< via: 1.1 Caddy
< content-type: text/plain; charset=utf-8
< content-length: 17
< 
* Ignoring the response-body
* Connection #1 to host pve-01.mydomain.com left intact
* Issue another request to this URL: 'https://pve-01.mydomain.com/'
* Found bundle for host: 0x5b231a07fee0 [can multiplex]
* Re-using existing connection #1 with host pve-01.mydomain.com
* h2h3 [:method: GET]
* h2h3 [:path: /]
* h2h3 [:scheme: https]
* h2h3 [:authority: pve-01.mydomain.com]
* h2h3 [user-agent: curl/7.88.1]
* h2h3 [accept: */*]
* Using Stream ID: 5 (easy handle 0x5b231a0837a0)
> GET / HTTP/2
> Host: pve-01.mydomain.com
> user-agent: curl/7.88.1
> accept: */*
> 
< HTTP/2 301 
< alt-svc: h3=":443"; ma=2592000
< cache-control: max-age=0
< date: Sun, 29 Jun 2025 04:04:58 GMT
< expires: Sun, 29 Jun 2025 04:04:58 GMT
< location: https://pve-01.mydomain.com/
< pragma: no-cache
< server: pve-api-daemon/3.0
< via: 1.1 Caddy
< content-type: text/plain; charset=utf-8
< content-length: 17
< 
* Ignoring the response-body
* Connection #1 to host pve-01.mydomain.com left intact
* Maximum (3) redirects followed
curl: (47) Maximum (3) redirects followed
4

It looks like Proxmox doesn’t like the way it’s being accessed and keeps redirecting you. The 301 redirect isn’t coming from Caddy - that’s Proxmox. Caddy typically uses 308 redirects.

Try this:

curl -Lvk --max-redirs 3 http://192.168.1.2:8006

I’m assuming port 8006 is using HTTP. If it’s actually HTTPS, use this instead:

curl -Lvk --max-redirs 3 https://192.168.1.2:8006
5

HTTP command gave me this…

root@caddy:~# curl -Lvk --max-redirs 3 http://192.168.1.2:8006
*   Trying 192.168.1.2:8006...
* Connected to 192.168.1.2 (192.168.1.2) port 8006 (#0)
> GET / HTTP/1.1
> Host: 192.168.1.2:8006
> User-Agent: curl/7.88.1
> Accept: */*
> 
< HTTP/1.1 301 Moved Permanently
< Cache-Control: max-age=0
< Connection: Keep-Alive
< Date: Sun, 29 Jun 2025 05:15:05 GMT
< Pragma: no-cache
< Location: https://192.168.1.2:8006/
< Server: pve-api-daemon/3.0
< Content-Length: 17
< Expires: Sun, 29 Jun 2025 05:15:05 GMT
< 
* Ignoring the response-body
* Connection #0 to host 192.168.1.2 left intact
* Clear auth, redirects scheme from HTTP to https
* Issue another request to this URL: 'https://192.168.1.2:8006/'
* Found bundle for host: 0x5a22ade09440 [serially]
* Can not multiplex, even if we wanted to
* Connection 0 seems to be dead
* Closing connection 0
* Hostname 192.168.1.2 was found in DNS cache
*   Trying 192.168.1.2:8006...
* Connected to 192.168.1.2 (192.168.1.2) port 8006 (#1)
* ALPN: offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN: server did not agree on a protocol. Uses default.
* Server certificate:
*  subject: OU=PVE Cluster Node; O=Proxmox Virtual Environment; CN=pve-01.localdomain
*  start date: Jun 13 10:27:23 2025 GMT
*  expire date: Jun 13 10:27:23 2027 GMT
*  issuer: CN=Proxmox Virtual Environment; OU=b32cacfc-b60a-4ddc-8059-ba40c17a6bd7; O=PVE Cluster Manager CA
*  SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
* using HTTP/1.x
> GET / HTTP/1.1
> Host: 192.168.1.2:8006
> User-Agent: curl/7.88.1
> Accept: */*
> 
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
< HTTP/1.1 200 OK
< Cache-Control: max-age=0
< Connection: Keep-Alive
< Date: Sun, 29 Jun 2025 05:15:05 GMT
< Pragma: no-cache
< Server: pve-api-daemon/3.0
< Content-Length: 2507
< Content-Type: text/html; charset=utf-8
< Expires: Sun, 29 Jun 2025 05:15:05 GMT
< 
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>pve-01 - Proxmox Virtual Environment</title>
    <link rel="icon" sizes="128x128" href="/pve2/images/logo-128.png" />
    <link rel="apple-touch-icon" sizes="128x128" href="/pve2/images/logo-128.png" />
    <link rel="stylesheet" type="text/css" href="/pve2/ext6/theme-crisp/resources/theme-crisp-all.css?ver=7.0.0" />
    <link rel="stylesheet" type="text/css" href="/pve2/ext6/crisp/resources/charts-all.css?ver=7.0.0" />
    <link rel="stylesheet" type="text/css" href="/pve2/fa/css/font-awesome.css" />
    <link rel="stylesheet" type="text/css" href="/pve2/font-logos/css/font-logos.css" />
    <link rel="stylesheet" type="text/css" href="/pve2/css/ext6-pve.css?ver=8.4.0" />
    <link rel="stylesheet" type="text/css" href="/pwt/css/ext6-pmx.css?ver=v4.3.10-t1744126616" />
    <link rel="stylesheet" type="text/css" media="(prefers-color-scheme: dark)" href="/pwt/themes/theme-proxmox-dark.css?ver=v4.3.10-t1744126616" />
    
    <script type='text/javascript'>function gettext(buf) { return buf; }</script>
    
    <script type="text/javascript" src="/pve2/ext6/ext-all.js?ver=7.0.0"></script>
    <script type="text/javascript" src="/pve2/ext6/charts.js?ver=7.0.0"></script>
    
    <script type="text/javascript" src="/pve2/js/u2f-api.js"></script>
    <script type="text/javascript" src="/qrcode.min.js"></script>
    <script type="text/javascript">
    Proxmox = {
        Setup: { auth_cookie_name: 'PVEAuthCookie' },
        defaultLang: 'en',
        NodeName: 'pve-01',
        UserName: '',
        CSRFPreventionToken: 'null',
        ConsentText: ''
    };
    </script>
    <script type="text/javascript" src="/proxmoxlib.js?ver=v4.3.10-t1744126616"></script>
    <script type="text/javascript" src="/pve2/js/pvemanagerlib.js?ver=8.4.0"></script>
    <script type="text/javascript" src="/pve2/ext6/locale/locale-en.js?ver=7.0.0"></script>

    <script type="text/javascript">
    if (typeof(PVE) === 'undefined') PVE = {};
    Ext.History.fieldid = 'x-history-field';
    Ext.onReady(function() { Ext.create('PVE.StdWorkspace');});
    </script>

  </head>
  <body>
    <!-- Fields required for history management -->
    <form id="history-form" class="x-hidden">
    <input type="hidden" id="x-history-field"/>
    </form>
  </body>
</html>
* Connection #1 to host 192.168.1.2 left intact

HTTPS …

root@caddy:~# curl -Lvk --max-redirs 3 https://192.168.1.2:8006
*   Trying 192.168.1.2:8006...
* Connected to 192.168.1.2 (192.168.1.2) port 8006 (#0)
* ALPN: offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN: server did not agree on a protocol. Uses default.
* Server certificate:
*  subject: OU=PVE Cluster Node; O=Proxmox Virtual Environment; CN=pve-01.localdomain
*  start date: Jun 13 10:27:23 2025 GMT
*  expire date: Jun 13 10:27:23 2027 GMT
*  issuer: CN=Proxmox Virtual Environment; OU=b32cacfc-b60a-4ddc-8059-ba40c17a6bd7; O=PVE Cluster Manager CA
*  SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
* using HTTP/1.x
> GET / HTTP/1.1
> Host: 192.168.1.2:8006
> User-Agent: curl/7.88.1
> Accept: */*
> 
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
< HTTP/1.1 200 OK
< Cache-Control: max-age=0
< Connection: Keep-Alive
< Date: Sun, 29 Jun 2025 05:16:40 GMT
< Pragma: no-cache
< Server: pve-api-daemon/3.0
< Content-Length: 2507
< Content-Type: text/html; charset=utf-8
< Expires: Sun, 29 Jun 2025 05:16:40 GMT
< 
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>pve-01 - Proxmox Virtual Environment</title>
    <link rel="icon" sizes="128x128" href="/pve2/images/logo-128.png" />
    <link rel="apple-touch-icon" sizes="128x128" href="/pve2/images/logo-128.png" />
    <link rel="stylesheet" type="text/css" href="/pve2/ext6/theme-crisp/resources/theme-crisp-all.css?ver=7.0.0" />
    <link rel="stylesheet" type="text/css" href="/pve2/ext6/crisp/resources/charts-all.css?ver=7.0.0" />
    <link rel="stylesheet" type="text/css" href="/pve2/fa/css/font-awesome.css" />
    <link rel="stylesheet" type="text/css" href="/pve2/font-logos/css/font-logos.css" />
    <link rel="stylesheet" type="text/css" href="/pve2/css/ext6-pve.css?ver=8.4.0" />
    <link rel="stylesheet" type="text/css" href="/pwt/css/ext6-pmx.css?ver=v4.3.10-t1744126616" />
    <link rel="stylesheet" type="text/css" media="(prefers-color-scheme: dark)" href="/pwt/themes/theme-proxmox-dark.css?ver=v4.3.10-t1744126616" />
    
    <script type='text/javascript'>function gettext(buf) { return buf; }</script>
    
    <script type="text/javascript" src="/pve2/ext6/ext-all.js?ver=7.0.0"></script>
    <script type="text/javascript" src="/pve2/ext6/charts.js?ver=7.0.0"></script>
    
    <script type="text/javascript" src="/pve2/js/u2f-api.js"></script>
    <script type="text/javascript" src="/qrcode.min.js"></script>
    <script type="text/javascript">
    Proxmox = {
        Setup: { auth_cookie_name: 'PVEAuthCookie' },
        defaultLang: 'en',
        NodeName: 'pve-01',
        UserName: '',
        CSRFPreventionToken: 'null',
        ConsentText: ''
    };
    </script>
    <script type="text/javascript" src="/proxmoxlib.js?ver=v4.3.10-t1744126616"></script>
    <script type="text/javascript" src="/pve2/js/pvemanagerlib.js?ver=8.4.0"></script>
    <script type="text/javascript" src="/pve2/ext6/locale/locale-en.js?ver=7.0.0"></script>

    <script type="text/javascript">
    if (typeof(PVE) === 'undefined') PVE = {};
    Ext.History.fieldid = 'x-history-field';
    Ext.onReady(function() { Ext.create('PVE.StdWorkspace');});
    </script>

  </head>
  <body>
    <!-- Fields required for history management -->
    <form id="history-form" class="x-hidden">
    <input type="hidden" id="x-history-field"/>
    </form>
  </body>
</html>
* Connection #0 to host 192.168.1.2 left intact
6

Is there a certain Caddyfile syntax that will help me overcome Proxmox’s 301 redirect?

7

That’s why we’re troubleshooting it first to find out what’s going on. You didn’t provide much information in your original post :slight_smile:

Change this:

pve-01.mydomain.com {
        reverse_proxy 192.168.1.2:8006
}

to this:

pve-01.mydomain.com {
        reverse_proxy https://192.168.1.2:8006 {
                transport http {
                        tls_insecure_skip_verify
                }
        }
}
2 Likes
8

Didn’t I? So sorry!

You sir - ROCK!!! I’m in business now.

Thank you very much!

9

Very grateful indeed. Appreciate your time for me. !!!

1 Like
10

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