OK I changed the port of web management to 8081 as you can see on my conf below.
Now when I access my external IP (187.72.138.193) from an external network on port 80 I got a timeout error.
When I access my external IP from an external network on port 8081 I see my SRX device web management page.
name-server { 208.67.222.222; 208.67.220.220; } login { user admin { uid 2000; class super-user; authentication { encrypted-password "$1$vo1HUMSt$GYLlMi6geHv9zTEg0OFAG."; } } } services { ssh; telnet; xnm-clear-text; web-management { http { port 8081; } https { system-generated-certificate; } } dhcp { maximum-lease-time 28800; default-lease-time 28800; name-server { 10.196.24.31; } router { 10.196.24.1; } pool 10.196.24.0/24 { address-range low 10.196.24.51 high 10.196.24.210; exclude-address { 10.196.24.177; 10.196.24.178; 10.196.24.74; } } propagate-settings ge-0/0/0.0; } } syslog { archive size 100k files 3; user * { any emergency; } file messages { any critical; authorization info; } file interactive-commands { interactive-commands error; } } max-configurations-on-flash 5; max-configuration-rollbacks 5; license { autoupdate { url https://ae1.juniper.net/junos/key_retrieval; } } ntp { server 200.160.7.186 prefer; } } interfaces { ge-0/0/0 { unit 0 { family inet { address 187.72.138.193/28; } } } ge-0/0/1 { unit 0 { family inet { address 10.196.25.1/24; } } } ge-0/0/2 { unit 0 { family ethernet-switching { vlan { members vlan-trust; } } } } ge-0/0/3 { unit 0 { family ethernet-switching { vlan { members vlan-trust; } } } } ge-0/0/4 { unit 0 { family ethernet-switching { vlan { members vlan-trust; } } } } ge-0/0/5 { unit 0 { family ethernet-switching { vlan { members vlan-trust; } } } } ge-0/0/6 { unit 0 { family ethernet-switching { vlan { members vlan-trust; } } } } ge-0/0/7 { unit 0 { family ethernet-switching { vlan { members vlan-trust; } } } } ge-1/0/0 { description "##Backbone##"; gigether-options { auto-negotiation; } unit 0 { description "##Backbone##"; family inet { address 10.196.24.1/24 { primary; } } } } st0 { unit 0 { family inet; family inet6; } } vlan { unit 0; } } routing-options { static { route 0.0.0.0/0 next-hop 187.72.138.206; route 10.0.0.0/8 next-hop st0.0; route 58.87.44.105/32 next-hop st0.0; route 58.87.44.106/32 next-hop st0.0; route 58.87.44.107/32 next-hop st0.0; route 58.87.44.93/32 next-hop st0.0; } } protocols { stp; } security { ike { proposal pre-g2-3des-sha { authentication-method pre-shared-keys; dh-group group2; authentication-algorithm sha1; encryption-algorithm 3des-cbc; lifetime-seconds 28800; } policy Rotem { mode aggressive; proposals pre-g2-3des-sha; pre-shared-key ascii-text "$9$kmQnhclWX-tueW8LbwjHqmz6ApB"; } gateway Rotem { ike-policy Rotem; address 58.87.57.67; local-identity hostname rotem_brazil_newararaquara; external-interface ge-0/0/0; } } ipsec { proposal esp-3des-sha { protocol esp; authentication-algorithm hmac-sha1-96; encryption-algorithm 3des-cbc; lifetime-seconds 3600; } policy Rotem { proposals esp-3des-sha; } vpn Rotem { bind-interface st0.0; ike { gateway Rotem; no-anti-replay; ipsec-policy Rotem; } establish-tunnels immediately; } } utm { feature-profile { web-filtering { type surf-control-integrated; surf-control-integrated { server; } } } } screen { ids-option untrust-screen { icmp { ping-death; } ip { source-route-option; tear-drop; } tcp { syn-flood { alarm-threshold 1024; attack-threshold 200; source-threshold 1024; destination-threshold 2048; timeout 20; } land; } } } nat { source { rule-set trust-to-untrust { from zone trust; to zone untrust; rule source-nat-rule { match { source-address 0.0.0.0/0; } then { source-nat { interface; } } } } rule-set DMZ-TO-INTERNET { from zone DMZ-trust; to zone untrust; rule DMZ-TO-INTERNET { match { source-address 10.196.24.31/24; destination-address 0.0.0.0/0; } then { source-nat { interface; } } } } } destination { pool dnat_10_196_24_31m24 { address 10.196.24.31/32 port 80; } rule-set DEST-NAT { from zone untrust; rule WEB-SERVER-TCP-80 { match { destination-address 187.72.138.193/32; destination-port 80; } then { destination-nat pool dnat_10_196_24_31m24; } } } } } policies { from-zone trust to-zone untrust { policy trust-to-untrust { match { source-address any; destination-address any; application any; } then { permit; } } policy catia-alc-license { description catia-alc-license; match { source-address trust; destination-address [ catia catia2 catia3 ]; application any; } then { deny; } } } from-zone untrust to-zone trust { policy RotemVPN { match { source-address 10.0.0.0/8; destination-address any; application any; } then { permit; log { session-close; } } } } from-zone untrust to-zone DMZ-trust { policy INTERNET-TO-DMZ { match { source-address any; destination-address WebServer; application HTTP; } then { permit; } } } } zones { security-zone trust { address-book { address trust 10.196.24.0/32; } host-inbound-traffic { system-services { all; } protocols { all; } } interfaces { vlan.0; ge-1/0/0.0; } } security-zone untrust { address-book { address 10.0.0.0/8 10.0.0.0/8; address catia 10.196.34.46/32; address catia2 10.196.34.47/32; address catia3 10.196.34.48/32; } screen untrust-screen; host-inbound-traffic { system-services { all; } } interfaces { ge-0/0/0.0 { host-inbound-traffic { system-services { dhcp; tftp; ike; all; } } } st0.0; } } security-zone DMZ-trust { address-book { address WebServer 10.196.24.31/32; } } } } applications { application HTTP { protocol tcp; destination-port 80; } } vlans { vlan-trust { vlan-id 3; l3-interface vlan.0; } }