I having faced issue to open umbraco 7 project Backoffice
umbraco:1 Refused to apply style from DependencyHandler.axd?s=L3VtYnJhY28vYXNzZXRzL2Nzcy91bWJyYWNvLmNzczsvdW1icmFjb19jbGllbnQvdHJlZS90cmVlaWNvbnMuY3NzOy91bWJyYWNvL2xpYi9ib290c3RyYXAtc29jaWFsL2Jvb3RzdHJhcC1zb2NpYWwuY3NzOy91bWJyYWNvL2xpYi9mb250LWF3ZXNvbWUvY3NzL2ZvbnQtYXdlc29tZS5taW4uY3NzOw&t=Css&cdv=131566447' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
clink on that link
HTTP Error 403.0 - ModSecurity Action
You do not have permission to view this directory or page
I having faced issue to open umbraco 7 project Backoffice
umbraco:1 Refused to apply style from DependencyHandler.axd?s=L3VtYnJhY28vYXNzZXRzL2Nzcy91bWJyYWNvLmNzczsvdW1icmFjb19jbGllbnQvdHJlZS90cmVlaWNvbnMuY3NzOy91bWJyYWNvL2xpYi9ib290c3RyYXAtc29jaWFsL2Jvb3RzdHJhcC1zb2NpYWwuY3NzOy91bWJyYWNvL2xpYi9mb250LWF3ZXNvbWUvY3NzL2ZvbnQtYXdlc29tZS5taW4uY3NzOw&t=Css&cdv=131566447' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
clink on that link
HTTP Error 403.0 - ModSecurity Action You do not have permission to view this directory or page
Have you tried bumping the Client Dependency Framework version?
https://adolfi.dev/blog/umbraco-bump-cdf/
There need to whitelist the IP address for access the Backoffice locally
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