Installation SSL Certificate on Ubuntu/Linuxmint/Debian to Secure Apache 

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@Robert Smith bullshit, this is self-signed certificate This is why it is not accepted by the browser. You can use let's encrypt if you need free SSL cert. Anyway it worked for me.

It sounds like you're encountering an issue with Jenkins not integrating properly with Tuleap due to SSL certificate verification problems, specifically mentioning SHA-256 and hostname verification. Here are some steps you can take to troubleshoot and resolve this issue: 1. Verify SSL Certificate Installation Make sure that your SSL certificate (which you converted to HTTPS) is correctly installed on your Jenkins server. Ensure the following: The certificate chain is properly configured. The certificate is signed by a trusted CA (Certificate Authority). The private key matches the certificate. There are no intermediate certificates missing. 2. Check Jenkins Configuration Ensure that Jenkins is configured to use HTTPS properly: Open your Jenkins configuration file (typically located at /etc/default/jenkins or /etc/sysconfig/jenkins on Linux systems). Verify that JENKINS_HTTPS_KEYSTORE and JENKINS_HTTPS_KEYSTORE_PASSWORD (or similar) are correctly set to point to your SSL keystore and password. 3. Update Java Keystore (if necessary) If you've updated or replaced your SSL certificate, ensure that Java (which Jenkins runs on) is using the updated certificate: Convert your SSL certificate to a Java keystore format if needed: openssl pkcs12 -export -in your_domain.crt -inkey your_private.key -out jenkins.p12 -name jenkins keytool -importkeystore -srckeystore jenkins.p12 -srcstoretype PKCS12 -destkeystore jenkins.jks -deststoretype JKS Restart Jenkins after updating the keystore. 4. Tuleap Configuration Verify Tuleap's configuration to ensure it can communicate securely with Jenkins: Check Tuleap's configuration for Jenkins integration settings. Ensure Tuleap is configured to trust the SSL certificate presented by Jenkins. 5. Debug SSL/TLS Handshake If the hostname verification is failing, it could be due to mismatched DNS names or the certificate's Subject Alternative Name (SAN) not including the Jenkins server's hostname. Use OpenSSL to debug the SSL/TLS handshake: openssl s_client -connect your_jenkins_server:443 Look for any errors or warnings related to the certificate validation. 6. Verify DNS Configuration Ensure that the DNS name used to access Jenkins matches the Common Name (CN) or SAN of the SSL certificate. 7. Jenkins Plugin Updates Ensure that both Jenkins and any relevant plugins (especially those related to SSL/TLS or integration with Tuleap) are updated to the latest versions. Older versions may have bugs or compatibility issues. 8. Debugging Logs Check the Jenkins and Tuleap logs for any specific error messages related to SSL/TLS handshake failures or certificate validation issues. This can provide more insight into what's going wrong.

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Yes, when setting up SSL/TLS for Elasticsearch, you will need to configure the SSL certificate and private key in the elasticsearch.yml file. Here are the general steps to enable SSL for Elasticsearch: Obtain an SSL certificate and private key from a trusted certificate authority (CA) or generate a self-signed certificate for testing purposes. Make sure you have the certificate file (crt), private key file (key), and any intermediate certificate files if applicable. Copy the certificate files to a directory on your Elasticsearch server. For example, you can create a directory called certs within your Elasticsearch configuration directory and place the certificate and key files there. Open the elasticsearch.yml file in a text editor. This file is typically located in the config directory of your Elasticsearch installation. Locate the section for SSL/TLS settings in the elasticsearch.yml file. If the section does not exist, you can add it at the bottom of the file. It should look similar to the following: # SSL/TLS Settings xpack.security.http.ssl.enabled: true xpack.security.http.ssl.key: /path/to/certs/key.pem xpack.security.http.ssl.certificate: /path/to/certs/cert.pem xpack.security.http.ssl.certificate_authorities: ["/path/to/certs/ca.pem"] Replace /path/to/certs/key.pem, /path/to/certs/cert.pem, and /path/to/certs/ca.pem with the actual paths to your SSL certificate and key files. Save the elasticsearch.yml file and exit the text editor. Restart Elasticsearch to apply the SSL configuration changes. Please note that the specific configuration may vary depending on your Elasticsearch version and setup. It is recommended to refer to the official Elasticsearch documentation or the documentation provided by your Elasticsearch distribution for detailed and up-to-date instructions on configuring SSL/TLS. Here are some useful links to the official Elasticsearch documentation on setting up SSL/TLS: Encrypting Communications www.elastic.co/guide/en/elasticsearch/reference/current/configuring-tls.html Securing Elasticsearch www.elastic.co/guide/en/elasticsearch/reference/current/securing-elasticsearch.html These resources should provide you with more comprehensive information and examples on configuring SSL/TLS for Elasticsearch.

The x509 parameter indicates that this will be a self-signed certificate. Certificate Authorities do not verify self-signed certificates.

In your apache configuration after installation cert you can go to the location /etc/ssl/cert and then run the below command for: sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048 We will create a tutorial for that ASAP For more topics subscribe to our channel, ru-vid.com/show-UCvTQ6WM-MSvCFVNCEtI6HPg

* First of all, make sure all your commands would be run with Sudo. * Sometimes it was caused because SELinux turned on and this file was inaccessible for apache user. For more topics subscribe to our channel, ru-vid.com/show-UCvTQ6WM-MSvCFVNCEtI6HPg

* Most distros put their certificates soft-link in system-wide location at /etc/ssl/certs. * Key files go into /etc/ssl/private * System-provided actual files are located at /usr/share/ca-certificates * Custom certificates go into /usr/local/share/ca-certificates For more topics subscribe to our channel, ru-vid.com/show-UCvTQ6WM-MSvCFVNCEtI6HPg

Yes we will enable. For more topics subscribe to our channel, ru-vid.com/show-UCvTQ6WM-MSvCFVNCEtI6HPg

If you want to create directory inside parent directory you can use mkdir -p For more topics subscribe to our channel, ru-vid.com/show-UCvTQ6WM-MSvCFVNCEtI6HPg

@@linuxhelp5096 you can add sudo to elevate the command

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To reflex the changes what have you made in configuration you have to restart the service by using anyone of the command: sudo /etc/init.d/apache2 restart sudo service apache2 restart sudo service apache2 reload For more topics subscribe to our channel, ru-vid.com/show-UCvTQ6WM-MSvCFVNCEtI6HPg

exactly

Is it safe enough for a local "test" network that is getting a lot of SSL errors on its internal mail server page

why is dangerous?

If your output does not give specific information about the error location in Apache’s configuration files, you will need to examine journalctl output from the systemd logs. sudo journalctl -u apache2.service --since today --no-pager If you have an AH00526 error in your Apache configuration, look through the journalctl command. the AH00526 error. Since this error is a general error related to an invalid setting or a typo in a configuration file In this case it is a directive called SSLCertificateFile, which will only be valid if the ssl module is enabled. sudo a2enmod ssl sudo systemctl restart apache2.service apachectl configtest command is useful for catching syntax errors before reloading apache with a new configuration. show for error message removing the directive will resolve the issue. sudo apachectl configtest Ref Link : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-CRiwgzzlwO4.html For more topics subscribe to our channel, ru-vid.com/show-UCvTQ6WM-MSvCFVNCEtI6HPg

You can try with mkdir -p /path-to-directory/directory-name For more topics subscribe to our channel, ru-vid.com/show-UCvTQ6WM-MSvCFVNCEtI6HPg

@@linuxhelp5096 so would that be mkrdir -p /var/www/mine ?

openssl req -x509 -nodes -days 90 -newkey rsa:2048 -keyout /etc/ssl/ssl/private/house.key -out /etc/ssl/certs/my.crt