New: Linux-Servers.md

Linux-Servers.md

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+# Troubleshoot datacenter server https error
+
+## Setup
+
+The datacenter server is maintained with Virtualmin.
+The domain causing the problem is "kipurchat.creature-go.com".
+The SSL certificate provider is Let's Encrypt.
+
+## Problem
+
+When trying to open "kipurchat.creature-go.com" the web browser shows this
+error (first section and certificates cut out):
+
+```
+net::ERR_CERT_DATE_INVALID
+Subject: kipurchat.creature-go.com
+
+Issuer: R13
+
+Expires on: 28.01.2026
+
+Current date: 14.03.2026
+
+Certificate Transparency:
+
+SCT Google 'Argon2026h1' log (Embedded in certificate, Verified)
+
+SCT Let's Encrypt 'Oak2026h1' (Embedded in certificate, Verified)
+```
+
+## First own troubleshooting
+
+The Virtualmin webpage SSL Certificate
+In domain kipurchat.creature-go.com
+shows that renewal of the certificate failed:
+"
+SSL certificate providers like Let's Encrypt can be used to automatically request a valid cert for use by Virtualmin.
+This page can be used to request a new certificate, which will overwrite any other you currently have configured for this domain. However, SSL certificate providers require that your ownership of the certificate domain be validated by checking that this system hosts the website for the domain. This is done by placing a small temporary file under the website's document directory /home/admincg/domains/kipurchat.creature-go.com/public_html.
+
+
+Request certificate for
+
+  Domains associated with this server 
+kipurchat.creature-go.com
+
+  Domain names listed here 
+
+   Also request wildcard certificate? 
+SSL certificate provider
+Let's Encrypt
+Automatically renew certificate
+
+  Yes 
+ 
+  No 
+Send email on renewal
+
+  Yes 
+ 
+  Only on failure 
+ 
+  No 
+Hostname verification
+
+  Attempt to request all hostnames, and fail if any cannot be validated 
+
+
+  Skip unresolvable hostnames, but fail if any remaining cannot be validated 
+
+
+  Exclude hostnames that cannot be validated from the certifcate 
+Certificate hash type
+
+RSA
+Time since last renewal
+0.00 months
+Last failed renewal
+03/14/2026 11:39 AM
+Renewal failed due to
+Web-based validation failed :
+Saving debug log to /var/log/letsencrypt/letsencrypt.log
+Renewing an existing certificate for kipurchat.creature-go.com
+An unexpected error occurred:
+AttributeError: can't set attribute
+Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.
+   DNS-based validation failed :
+Saving debug log to /var/log/letsencrypt/letsencrypt.log
+Renewing an existing certificate for kipurchat.creature-go.com
+An unexpected error occurred:
+AttributeError: can't set attribute
+Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.
+"
+
+## Your tasks
+
+Please help me by running these tasks:
+
+### Understand the root cause
+
+Why did the certificate renewal fail?
+
+### Repair the SSL certificate setup
+
+Change the SSL certificate setup so that future renewals will work.
+
+### Repair SSL connection
+
+If not already done by completing the task before, repair the SSL connection so that "kipurchat.creature-go.com" can be used again.
+
+