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When you start Web Help Desk using port 80, the following error message displays on your screen:
HTTP Status 404 - Servlet WOServletAdaptor is not available type Status report message Servlet WOServletAdaptor is not available description The requested resource (Servlet WOServletAdaptor is not available) is not available. Apache Tomcat/7.0.50
All WHD versions
Another application may be using port 80.
If IIS is running on the server, disable IIS. If the server is also running the SQL server, ensure that the SQL Server Reporting Service is not enabled.