telnet: Unable to connect to remote host: No route to host

Discussion in 'Server Operation' started by leeeonardo, Jul 30, 2008.

  1. leeeonardo

    leeeonardo New Member

    I have Centos 4.4 Server with ISP Config, but I send mail and dont happen nothing. And my logs say:
    telnet mx2.hotmail.com 25
    telnet: Unable to connect to remote host: No route to host

    Thanks for help me.
     
  2. leeeonardo

    leeeonardo New Member

    Jul 29 17:02:49 local postfix/smtpd[24924]: warning: 192.168.1.100: hostname JLRSoftware verification failed: Name or service not known
    Jul 29 17:02:49 local postfix/smtpd[24924]: connect from unknown[192.168.1.100]
    Jul 29 17:02:49 local postfix/smtpd[24924]: 5F7B7B4181: client=unknown[192.168.1.100], sasl_method=LOGIN, sasl_username=web5_prueba
    Jul 29 17:02:49 local postfix/cleanup[24925]: 5F7B7B4181: message-id=<[email protected]>
    Jul 29 17:02:49 local postfix/qmgr[23147]: 5F7B7B4181: from=<[email protected]>, size=4240, nrcpt=1 (queue active)
    Jul 29 17:02:49 local postfix/smtp[24885]: connect to mx3.hotmail.com[65.54.244.72]: No route to host (port 25)
    Jul 29 17:02:51 local postfix/smtpd[24924]: disconnect from unknown[192.168.1.100]
    Jul 29 17:02:52 local postfix/smtp[24885]: connect to mx4.hotmail.com[65.54.244.232]: No route to host (port 25)
    Jul 29 17:02:55 local postfix/smtp[24885]: connect to mx2.hotmail.com[65.54.245.40]: No route to host (port 25)
    Jul 29 17:02:58 local postfix/smtp[24885]: connect to mx3.hotmail.com[65.54.244.200]: No route to host (port 25)
    Jul 29 17:03:01 local postfix/smtp[24885]: connect to mx2.hotmail.com[65.54.244.168]: No route to host (port 25)
     
  3. topdog

    topdog New Member HowtoForge Supporter

    Either your default route does not exist or you have a firewall blocking the connection
     
  4. leeeonardo

    leeeonardo New Member

    I have disabled the firewall and disable SELinux

    [root@local /]# 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

    And check that network:

    [root@local /]# netstat -tap
    Active Internet connections (servers and established)
    Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
    tcp 0 0 *:mysql *:* LISTEN 3304/mysqld
    tcp 0 0 *:sunrpc *:* LISTEN 3010/portmap
    tcp 0 0 *:81 *:* LISTEN 3688/ispconfig_http
    tcp 0 0 local.jlr-software.c:domain *:* LISTEN 3815/named
    tcp 0 0 localhost.localdomai:domain *:* LISTEN 3815/named
    tcp 0 0 localhost.localdomain:ipp *:* LISTEN 3142/cupsd
    tcp 0 0 *:smtp *:* LISTEN 8018/master
    tcp 0 0 localhost.localdomain:rndc *:* LISTEN 3815/named
    tcp 0 0 *:667 *:* LISTEN 3029/rpc.statd
    tcp 0 0 *:imaps *:* LISTEN 3330/dovecot
    tcp 0 0 *:pop3s *:* LISTEN 3330/dovecot
    tcp 0 0 *:pop3 *:* LISTEN 3330/dovecot
    tcp 0 0 *:imap *:* LISTEN 3330/dovecot
    tcp 0 0 *:http *:* LISTEN 3713/httpd
    tcp 0 0 *:ftp *:* LISTEN 3833/proftpd: (acce
    tcp 0 0 *:ssh *:* LISTEN 3188/sshd
    tcp 0 0 ::1:rndc *:* LISTEN 3815/named
    tcp 0 0 *:https *:* LISTEN 3713/httpd
    tcp 0 268 local.jlr-software.com:ssh ::ffff:192.168.1.100:3575 ESTABLISHED 4399/0
    tcp 0 0 local.jlr-software.com:pop3 ::ffff:192.168.1.100:1177 TIME_WAIT -

    And My Route forwaring the ports to server:

    TCP 21, 80, 25, 110, 81, 22, 143, 53
    UDP 53
     
  5. topdog

    topdog New Member HowtoForge Supporter

    whats the output of
    Code:
    netstat -nr
     
  6. leeeonardo

    leeeonardo New Member

    [root@local ~]# netstat -nr
    Kernel IP routing table
    Destination Gateway Genmask Flags MSS Window irtt Iface
    192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
    169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
    0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth0
     
  7. topdog

    topdog New Member HowtoForge Supporter

    i take it 192.168.1.254 is your router ? it could be your ISP blocking port 25 and they want you to use their relay server instead. Try telneting to your ISP's relay servers if it works then you will have to configure your mail server to use them as a smarthost.
     
  8. leeeonardo

    leeeonardo New Member

    Yes, my route is 192.168.1.254. And this is info of my ISP:
    Dirección de Internet: 189.176.121.90
    Máscara de subred: 255.255.255.255
    Puerta de enlace predeterminada: 200.38.193.226
    Servidor principal de nombres de dominio: 200.23.242.177
    Servidor secundario de nombres de dominio: 200.23.242.185

    [root@local ~]# telnet 200.38.193.226 25
    Trying 200.38.193.226...
    telnet: connect to address 200.38.193.226: No route to host
    telnet: Unable to connect to remote host: No route to host
     
  9. topdog

    topdog New Member HowtoForge Supporter

    I do not understand spanish but from what i see Puerta de enlace predeterminada is not an smtp server it is your default gateway

    You need to ask your ISP for the smtp relay server you are supposed to use especially if you are on DSL
     

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