Thanks for your answer but I have enabled http and the router is not accessible from remote. Maybe this is not enough for remote administration.
My configuration is:
config uhttpd main
list listen_http 80
list listen_https 443
option enablehttp 1
option home /www
option rfc1918_filter 1
option max_requests 3
option max_connections 100
option cert /etc/uhttpd.crt
option key /etc/uhttpd.key
option cgi_prefix /cgi-bin
option script_timeout 600
option network_timeout 30
option http_keepalive 20
option tcp_keepalive 1
option ubus_prefix '/ubus'
config uhttpd hotspot
list listen_http 81
list listen_https 444
option enablehttp 1
option home /www/hotspot
option rfc1918_filter 1
option max_requests 3
option max_connections 100
option cert /etc/uhttpd.crt
option key /etc/uhttpd.key
option cgi_prefix /cgi
option script_timeout 600
option network_timeout 30
option http_keepalive 20
option tcp_keepalive 1
option no_dirlists '1'
option ubus_prefix '/ubus'
option disabled '1'
Thanks a lot