Hi, I having trouble calling a CFX tag as the server is throwing an error "500 null" and this seems to be the technote for the problem: http://kb.adobe.com/selfservice/viewContent.do?externalId=89755594&sliceId=2 This is the solution below. Any idea how I do it? Is it a win or cfmx permission? Solution In the Security Sandbox definition, add Read access to thecf_root\lib\CFXNeo.dll file and thecf_root\lib\updates directory. Thanks