log4net issues when web.config file is changed

We are using log4net in our asp.net web application.

We are using this log4net in a HTTPModule. Configuration for log4net is provided in a separate file and not in web.config file.

log4net is logging properly to the log file configured. When web.config file is changed the settings of the webapp a开发者_StackOverflow社区re reloaded. But, log4net stopped logging. Not able to figure out what is the issue.