Falha ao conectar à porta 127.0.0.1 80

Estou executando o servidor nginx (não importa qual servidor):

$ sudo netstat -tulpn | grep 80

  tcp     0      0 0.0.0.0:80   0.0.0.0:*         LISTEN      4268/nginx      
  tcp6    0      0 :::80        :::*              LISTEN      4268/nginx

E então eu enviei a solicitação para 127.0.0.1

$ curl -v 127.0.0.1

* Rebuilt URL to: 127.0.0.1/
* Hostname was NOT found in DNS cache
*   Trying 127.0.0.1...
* connect to 127.0.0.1 port 80 failed: Connection refused
* Failed to connect to 127.0.0.1 port 80: Connection refused
* Closing connection 0
curl: (7) Failed to connect to 127.0.0.1 port 80: Connection refused

$ telnet localhost 80

Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused

Tudo bem em / etc / hosts :

127.0.1.1   ubuntu-work
127.0.0.1   localhost

# The following lines are desirable for IPv6 capable hosts 
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

iptables desativado $ sudo iptables -L:

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

É interessante que eu possa me conectar a qualquer endereço 127 .. . * exceto 127.0.0.1 (localhost). E também posso me conectar com o meu endereço IP de sub-rede 10.0.2.15. E se eu mudar a porta 80 para outra na configuração do servidor (por exemplo, Listen 88), ela funcionará.

Eu tentei $ sudo nmap -sS 127.0.0.1 -p 80e consegui informações - 80 / tcp fechado , mas como é possível se estiver executando o servidor nginx na porta 80?

Nmap scan report for localhost (127.0.0.1)
Host is up (0.00011s latency).
PORT   STATE  SERVICE
80/tcp closed http

Nmap done: 1 IP address (1 host up) scanned in 1.12 seconds

a interface de loopback está ativa: $ ifconfig

eth0  Link encap:Ethernet  HWaddr 08:00:27:86:5f:e3  
      inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
      inet6 addr: fe80::a00:27ff:fe86:5fe3/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:588 errors:0 dropped:0 overruns:0 frame:0
      TX packets:616 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:262986 (262.9 KB)  TX bytes:103011 (103.0 KB)

lo    Link encap:Local Loopback  
      inet addr:127.0.0.1  Mask:255.0.0.0
      inet6 addr: ::1/128 Scope:Host
      UP LOOPBACK RUNNING  MTU:65536  Metric:1
      RX packets:276 errors:0 dropped:0 overruns:0 frame:0
      TX packets:276 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0 
      RX bytes:32750 (32.7 KB)  TX bytes:32750 (32.7 KB)

Outras tabelas do iptables

Saída de $ sudo iptables -t nat -nvL:

Chain PREROUTING (policy ACCEPT 1 packets, 40 bytes)
pkts bytes target     prot opt in     out     source               destination         
0     0 REDIRECT   tcp  --  eth0   *       0.0.0.0/0            0.0.0.0/0            tcp dpt:80 redir ports 20559
0     0 REDIRECT   tcp  --  eth0   *       0.0.0.0/0            0.0.0.0/0            tcp dpt:443 redir ports 20558

Chain INPUT (policy ACCEPT 1 packets, 40 bytes)
pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 1043 packets, 65731 bytes)
pkts bytes target     prot opt in     out     source               destination         
0     0 REDIRECT   tcp  --  *      *       0.0.0.0/0            127.0.0.1            tcp dpt:80 redir ports 20559
0     0 REDIRECT   tcp  --  *      *       0.0.0.0/0            127.0.0.1            tcp dpt:443 redir ports 20558

Chain POSTROUTING (policy ACCEPT 1043 packets, 65731 bytes)
pkts bytes target     prot opt in     out     source               destination

Eu não recebi nenhuma saída sudo iptables -t mangle -nVL, apenas versão:iptables v1.4.21

Saída de sudo iptables -t mangle -nL

   Chain PREROUTING (policy ACCEPT)
   target     prot opt source               destination         

   Chain INPUT (policy ACCEPT)
   target     prot opt source               destination         

   Chain FORWARD (policy ACCEPT)
   target     prot opt source               destination         

   Chain OUTPUT (policy ACCEPT)
   target     prot opt source               destination         

   Chain POSTROUTING (policy ACCEPT)
   target     prot opt source               destination

Por favor, ajude-me se você tiver alguma idéia sobre o bloqueio do localhost: 80.

linux ubuntu port localhost Al Che
fonte

suas interfaces de loopback estão ativadas?

C4f4t0r

c4f4t0r, sim, eu adicionei a saída ifconfig acima.

Al Che

Saída para os outros iptablesmesas, por favor (ou seja, iptables -t nat -nvLe iptables -t mangle -nVL)

roaima

Falha ao conectar à porta 127.0.0.1 80

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