You can customize the page that displays when a block
event occurs with corporate branding, acceptable use policies, and
other custom content.
However, you can create your own
custom response pages with your corporate branding, acceptable use
policies, and links to your internal resources.
Custom
response pages larger than the maximum supported size are not decrypted
or displayed to users. In PAN-OS 8.1.2 and earlier PAN-OS 8.1 releases,
custom response pages on a decrypted site cannot exceed 8,191 bytes;
the maximum size is increased to 17,999 bytes in PAN-OS 8.1.3 and
later releases.