asp.net - •Request filtering is configured for the Web server and the file extension for this request is explicitly denied -

http error 404.7 - not found

the request filtering module configured deny file extension.

i using visual studio 2013 web express. when running defalt.aspx running fine when run materpage.master throw me error. tried lots of solution , still not working( tried change web.conf). know can issues>?

code web.conf

<configuration>  <connectionstrings>     <add name="connectionstring" connectionstring="provider=msdaora;data source=xe;password=1234;user id=system"         providername="system.data.oledb" />     <add name="databasestring" connectionstring="provider=oraoledb.oracle.1;data source=xe;persist security info=true;password=1234;user id=system"         providername="system.data.oledb" />     <add name="soconnectionstring" connectionstring="provider=oraoledb.oracle.1;data source=xe;persist security info=true;password=1234;user id=so"         providername="system.data.oledb" /> </connectionstrings> <system.web>   <compilation debug="true" targetframework="4.5.1" />   <httpruntime targetframework="4.5.1" />  </system.web> 

you don't directly access master pages. access content page (.aspx) references master page.