nsjtp-data

NSJTP-DATA, operating on port 1688, is commonly used for network data transfer. It is often associated with Key Management Service (KMS) activation for Microsoft products. This service facilitates the activation of software licenses over a network.

What is nsjtp-data

NSJTP-DATA, operating on port 1688, is primarily used for network data transfer. One of its most notable uses is in the Key Management Service (KMS) for Microsoft products. KMS allows organizations to activate systems within their network without requiring individual connections to Microsoft. This is particularly useful for large enterprises that need to manage numerous licenses efficiently.

The Key Management Service (KMS) is a part of Microsoft's Volume Activation 2.0, which is designed to help businesses manage the activation of their software licenses. By using KMS, organizations can activate Windows operating systems and Office products locally, reducing the need for each machine to connect to Microsoft for activation. This not only streamlines the activation process but also enhances security by limiting external connections.

NSJTP-DATA's role in KMS involves facilitating the communication between client machines and the KMS host. When a client machine needs to be activated, it sends a request to the KMS host on port 1688. The KMS host then processes this request and activates the software if the conditions are met. This process is repeated periodically to ensure that the software remains activated and compliant with licensing terms.

nsjtp-data runs on TCP and UDP port 1688 and is official IANA port.

Security risk

If port 1688 is open and the NSJTP-DATA service is running, it could be exploited by unauthorized users to activate software illegally or to gain access to sensitive network data. Ensuring that only trusted devices and users can access this port is crucial to maintaining network security.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 1688. Use StackChanges to monitor if the nsjtp-data port is closed and stays closed. StackChanges will send an alert if port 1688 is open again.