Cannot get a Subdomain forward to a different port of parent IP

[Zeeshan Khan]

I could do this really easily with cPanel earlier, but now that I migrated to Virtualmin, I just do not know how.

If I have a site with domain www.mysite.com running on Webmin/Virtualmin, I just want a subdomain that can easily allow me to access the Virtualmin console.

Currently I always have to type www.mysite.com:10000 to get to Webmin/Virtualmin

I want to create a subdomain called webmin.mysite.com and this should automatically take me to www.mysite.com:10000

On my external DNS service I've already created a CNAME record set for webmin.mysite.com which points to mysite.com (that was the way it was done in cPanel too).

Now I need to configure Virtualmin somehow that whenever there is webmin.mysite.com in the URL, it will take me to www.mysite.com:10000

Help appreciated, thank you!

[Ilia]

Hi,

You need to setup proxy, something like that:

PROXY SETUP AS VIRTUAL-SERVER
https://sourceforge.net/p/webadmin/discussion/600155/thread/6eb89f60/?limit=25

/etc/webmin/config
referer=webmin.DOMAIN.COM

Apache SSL (/conf.d/ssl.conf) config (before closing virtualhost)
<IfModule mod_proxy.c>
    RewriteEngine On
    ProxyRequests Off
    SSLProxyEngine On
    SSLProxyVerify None 
    SSLProxyCheckPeerCN Off
    SSLProxyCheckPeerName Off
    SSLProxyCheckPeerExpire Off

    ServerName host.WEBMIN.DOMAIN.COM:433
    ServerAlias webmin.DOMAIN.COM
    ServerAlias serverowner.WEBMIN.DOMAIN.COM
    ServerAlias reseller.WEBMIN.DOMAIN.COM
    ServerAlias systemowner.WEBMIN.DOMAIN.COM
    ProxyPass / "https://127.0.0.1:10000/"
    ProxyPassReverse / "https://127.0.0.1:10000/"


    <Location />
        Header always set X-Frame-Options SAMEORIGIN
        Header edit Location webmin.DOMAIN.COM:433 webmin.DOMAIN.COM
        Header edit Location serverowner.WEBMIN.DOMAIN.COM:433 serverowner.WEBMIN.DOMAIN.COM
        Header edit Location reseller.WEBMIN.DOMAIN.COM:433 reseller.WEBMIN.DOMAIN.COM
        Header edit Location systemowner.WEBMIN.DOMAIN.COM:433 systemowner.WEBMIN.DOMAIN.COM
    </Location>

</IfModule>

[Zeeshan Khan]

Thanks very much, proxy seems to work, I searched a bit more on proxy and used the solution from here (bottom post): https://virtualmin.com/node/13580

• Created a sub domain webmin.mydomain.com (for example)
• In Server Configuration -> Edit Proxy Website set Proxying Enabled to Yes and write the Proxy to URL https://mydomain.com:10000
• Select mydomain.com in Virtualmin and in Server Configuration -> Manage SSL Certificate -> Let's Encrypt -> Request certificate (if you don't have already a certificate for this domain)
• In Server Configuration -> Manage SSL Certificate click the Copy to Webmin button to use mydomain.com certificate for webmin
• In Webmin, Webmin -> Webmin Configuration -> Trusted referrers add mydomain.com and webmin.mydomain.com to the Trusted websites list
  
  

  **I'm having 2 problems still:** 1) If I just type "webmin.mydomain.com" in the browser, it doesn't work as it directs to just http and says problem with Cookies, however if I type "https://webmin.mydomain.com" it works

  2) Even when it works with https, the SSL certificate for the parent site is not used https://webmin.mydomain.com shows as not secure

[Zeeshan Khan]

Resolved in Virtualmin forum here: https://forum.virtualmin.com/t/cannot-get-a-subdomain-forward-to-a-different-port-of-parent-ip/104600

Thanks Ilia for your help on both forums, cheers!