URL Rendezvous Directory for SSM

URD (URL Rendesvous Directory) on port 465 is primarily used for secure email transmission. It ensures that emails are sent and received over an encrypted connection, providing an additional layer of security. This port is often associated with SMTPS (Simple Mail Transfer Protocol Secure).

What is URL Rendezvous Directory for SSM

URD (URL Rendesvous Directory) on port 465 is a service used for secure email transmission. It is designed to ensure that emails are sent and received over an encrypted connection, which is crucial for maintaining the confidentiality and integrity of email communications. This port is often associated with SMTPS (Simple Mail Transfer Protocol Secure), which is an extension of SMTP with added security features.

The use of port 465 for secure email transmission became more common as the need for secure communication grew. Initially, port 465 was designated for SMTPS, but it was later reassigned to URD. Despite this, many email services continue to use port 465 for secure SMTP due to its widespread adoption and the need for backward compatibility.

URD and SMTPS on port 465 are essential for businesses and individuals who require secure email communication. By encrypting the data transmitted between email servers and clients, these services help protect sensitive information from being intercepted by malicious actors. This is particularly important for organizations that handle confidential data, such as financial institutions, healthcare providers, and legal firms.

URL Rendezvous Directory for SSM runs on TCP port 465 and is official IANA port.

Security risk

If port 465 is open and the service is running, it could be targeted by attackers attempting to intercept or manipulate email communications. Ensuring proper configuration and using strong encryption methods are crucial to mitigate these risks. Additionally, regular monitoring and updates are necessary to protect against vulnerabilities.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 465. Use StackChanges to monitor if the URL Rendezvous Directory for SSM port is closed and stays closed. StackChanges will send an alert if port 465 is open again.