Why I do not have access rights on the server?

http://stackoverflow.com/questions/10563370/why-i-do-not-have-access-rights-on-the-server

Maybe you should enable remote access

<elmah>
<security allowRemoteAccess="1" />
</elmah>

http://stackoverflow.com/questions/14481506/configuring-custom-authorization-with-elmah

<location path="elmah.axd" inheritInChildApplications="false">
<system.web>
<authorization>
<allow users="theUserName" />
<deny users="*" />
</authorization>
</system.web>
...other config settings
</location>