Allows engineers to modify the project configuration (add tags, change IP addresses) while the server is actively communicating with devices and providing data, minimizing downtime.
Kepware also offers free demo licenses for evaluation. Some distributors provide a two-hour demo license for customers evaluating KEPServerEX, allowing them to test connectivity with their PLCs and verify stability and performance before making a purchase decision.
KEPServerEX Version 4.0 is a legacy version of the industry-leading communications platform developed by Kepware Technologies. Originally released in the mid-2000s, this software was designed to connect disparate automation devices and applications, serving as a critical bridge between Operation Technology (OT) and Information Technology (IT). Kepserverex V4.0 Free Download
, as modern Windows security policies block older OPC DA communication protocols by default. Security Vulnerabilities
KEPServerEX是由美国Kepware公司（现为PTC旗下）开发的一款模块化的OPC服务器与工业通信平台。它的核心价值在于“连接一切”： Allows engineers to modify the project configuration (add
KEPServerEX V4.0是这一平台的一个早期版本，其最后一个发布版本是。这意味着，当你在2026年查找它时，它已经是一个 超过17岁 的“高龄”软件。
Legacy OPC DA relies heavily on Microsoft's Distributed Component Object Model (DCOM). In recent years, Microsoft hardened DCOM security settings globally across all supported Windows versions to mitigate remote code execution risks. Because KEPServerEX V4.0 cannot natively support modern, secure OPC UA (Unified Architecture) without external wrappers, placing a V4.0 installation on a network connected to the internet poses severe corporate and operational hazards. Upgrading from V4.0 to Modern Alternatives KEPServerEX Version 4
: Once the two-hour window expires, the software stops communicating. Users can restart the KEPServerEX runtime service to initiate another two-hour testing window.
This version reached its end-of-life status on November 15, 2016. It is no longer supported by the manufacturer, meaning it receives no security patches, technical support, or software updates.
: Legacy environments are highly vulnerable to modern encryption attacks.