In order to host isCOBOL EIS COBOL Servlets, you need to install and run a Servlet container. There are many Servlet containers available.

You can see lists and comparisons of Servlet containers at http://en.wikipedia.org/wiki/Comparison_of_web_servers. In the Features table, search for "Yes" in the Java Servlets column.

Veryant has tested and recommends Apache Tomcat 8.5 or above.