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By default, the Guest account has permissions to view graphs w/o authentication. Just set the default page for your cacti site to graph_view.php (instead of index.php). If you disabled the account, or mucked with other graph/tree/etc permission settings then it's up to you to fix.
weerok wrote:How to set the default page for cacti site to graph_view.php (instead of index.php)
I only find how to change Default Graph Tree
That's correct, you can only set a default tree. if you wan to to restrict things, then either set up a custom tree for them and/or set graph/tree permissions.