application can not run mod_mono index in the same directory where the application is running php default, this is why it causes these problems is solved instead of completing what you have written in the apache directives in ispconfig internal folder test example, then where it says:
/:/var/www/web1/web/
replace for:
/test:/var/www/web1/web/test/
complete apache directives:
MonoPath default "/usr/lib/mono/2.0"
MonoServerPath default /usr/bin/mod-mono-server2
AddMonoApplications default "/test:/var/www/web1/web/test/"
<location /test>
MonoSetServerAlias default
SetHandler mono
</location>
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