Before conducting a penetration test in a cloud environment, it is critical to first obtain permission from the cloud service provider. Cloud providers often have strict rules about penetration testing to avoid unintended service disruptions or violations of service agreements. Without this agreement, the company could face legal or operational consequences.

Use sudo before any command the password is the same password provided, everything in <> is not part of the command is variable. Sudo will show you every detail you need. First command
$sudo netstat -nltp, this will show you ip, port, pid, name of task.
For added value you can also run $sudo lsof -i :<port>. Now you need to find the service so you use $sudo systemctl --type=service | grep <name of task>, this will give you <something>.service my was <something>-resolve.service forgot the full name.
Suggest you do a $sudo systemctl status <full name service> to compare. After all that lets kill it all, First kill the pid $sudo kill -9 <pid>. Then lets complete the second part $sudo systemctl stop
<full name service>, follow by $sudo systemctl disable <full name service>.
Now for the cream on the top you verify that is gone $sudo netstat -nltp and $sudo systemctl status <full name service>.

Another means of providing up to date information regarding the status of a certificate is to check the certificate's status on an Online Certificate Status Protocol (OCSP) server, referred to as an OCSP responder. Rather than return a whole CRL, this just communicates the status of the requested certificate. Details of the OCSP responder service should be published in the certificate.

A digital signature is a cryptographic technique that allows the sender of a file to sign it with their private key and the receiver to verify it with the sender's public key. This ensures the integrity and authenticity of the file, as well as the non-repudiation of the sender.