Things that may require crossdomain.xml access:
- Adobe pdf reader
Example of a crossdomain.xml file:
This following example of a crossdomain file basically allows no access, it's the strictest policy.
<!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd">
If you want to allow access then it's important to learn the sercurity implications so have a read of the following articles before allowing access to your web server:
Other web server files that you may be interested in are: