403 Forbidden Error

[jasaf99]

when I install npm and make a new proxy host I allays get the Error 403 Forbidden or my browser doesn't find anything.
the service (Pihole) I like to access is running because I can access it via IP address the config is:
{
"domain_names": [
"http://XXXXXXXXXXX.XXX"
],
"forward_scheme": "http",
"forward_host": "192.168.178.75",
"forward_port": 85,
"access_list_id": 0,
"certificate_id": 0,
"meta": {
"letsencrypt_agree": false,
"dns_challenge": false
},
"advanced_config": "",
"locations": [],
"block_exploits": false,
"caching_enabled": false,
"allow_websocket_upgrade": false,
"http2_support": false,
"hsts_enabled": false,
"hsts_subdomains": false,
"ssl_forced": false,
"owner_user_id": 1
}

can anyone help me please ?