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Re: What Is Causing This Failure

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  • erol blakely
    ... Looks like more of a network issue and not postfix specific. Try to telnet to the remote host and see if you can connect (run a tcpdump at the same time to
    Message 1 of 17 , Dec 1, 2009
      On Tue, Dec 01, 2009 at 10:03:21AM -0500, Carlos Williams wrote:

      > CB87E778055 1337 Mon Nov 30 08:59:15 tpremore@...
      > (connect to a.mx.premore.net[198.186.193.20]: No route to host)
      > bj@...

      Looks like more of a network issue and not postfix specific.

      Try to telnet to the remote host and see if you can connect (run a
      tcpdump at the same time to see whats happening). Try simple
      network diagnostics (ie. ping, traceroute etc ...).

      /erol
    • Evan Platt
      ... D oh... Forgot which machine I was connected to.I tried it on the one that has port 25 blocked by the ISP. :) My bad, sorry :)
      Message 2 of 17 , Dec 1, 2009
        On Tue, 1 Dec 2009 16:13:02 +0100, you wrote:

        ># telnet 198.186.193.20 25
        >Trying 198.186.193.20...
        >Connected to 198.186.193.20.
        >Escape character is '^]'.
        >220 share.docforge.org ESMTP Postfix

        D'oh... Forgot which machine I was connected to.I tried it on the one
        that has port 25 blocked by the ISP. :)

        My bad, sorry :)
      • Carlos Williams
        On Tue, Dec 1, 2009 at 10:10 AM, Ralf Hildebrandt ... I am unable to connect via Telnet so it appears to be a network / ISP issue. carlos@tunafish:~$ telnet
        Message 3 of 17 , Dec 1, 2009
          On Tue, Dec 1, 2009 at 10:10 AM, Ralf Hildebrandt
          <Ralf.Hildebrandt@...> wrote:
          > Works OK. What does tracroute 198.186.193.20 return?
          > # traceroute 198.186.193.20
          > traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 60 byte packets
          > ... snip ...
          >  4  zr-pot1-te0-0-0-3.x-win.dfn.de (188.1.144.30)  5.288 ms  5.290 ms 5.281 ms
          >  5  cr02.frf02.pccwbtn.net (80.81.192.50)  18.030 ms  18.027 ms 18.132 ms
          >  6  carpathia.ge12-1.br02.ash01.pccwbtn.net (63.218.94.166)  109.111 ms  106.313 ms  106.528 ms
          >  7  xe-3-3.e4.iad1.cirn.net (209.222.130.29)  105.968 ms  106.036 ms 106.044 ms
          >  8  66.117.37.180 (66.117.37.180)  101.005 ms  100.773 ms  101.520 ms
          >  9  * * *
          >  10  * * *
          >  11  * * *
          >  12  * * *
          >  13  * * *
          >  14  * * *
          >  15  * * *
          >  16  * * *
          >  17  * * *
          >  18  * * *
          >  19  * * *
          >  20  * * *
          >  21  * * *
          >  22  * * *
          >  23  * * *
          >  24  * * *
          >  25  dns5.docforge.org (198.186.193.20)  4.241 ms  1.685 ms  0.271 ms

          I am unable to connect via Telnet so it appears to be a network / ISP issue.

          carlos@tunafish:~$ telnet 198.186.193.20 25
          Trying 198.186.193.20...
          telnet: Unable to connect to remote host: No route to host
        • Ralf Hildebrandt
          ... What is the output of traceroute 198.186.193.20 ? -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin
          Message 4 of 17 , Dec 1, 2009
            * Carlos Williams <carloswill@...>:

            > >  25  dns5.docforge.org (198.186.193.20)  4.241 ms  1.685 ms  0.271 ms
            >
            > I am unable to connect via Telnet so it appears to be a network / ISP issue.
            >
            > carlos@tunafish:~$ telnet 198.186.193.20 25
            > Trying 198.186.193.20...
            > telnet: Unable to connect to remote host: No route to host

            What is the output of traceroute 198.186.193.20 ?
            --
            Ralf Hildebrandt
            Geschäftsbereich IT | Abteilung Netzwerk
            Charité - Universitätsmedizin Berlin
            Campus Benjamin Franklin
            Hindenburgdamm 30 | D-12203 Berlin
            Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
            ralf.hildebrandt@... | http://www.charite.de
          • Carlos Williams
            On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt ... I get no results from my mail server: traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte
            Message 5 of 17 , Dec 1, 2009
              On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt
              <Ralf.Hildebrandt@...> wrote:
              > What is the output of traceroute 198.186.193.20 ?

              I get no results from my mail server:

              traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets
              1 * * *
              2 * * *
              3 * * *
              4 * * *
              5 * * *
              .
              .
              .
              29 * * *
              30 * * *

              Strange...
            • Frog
              Perhaps your mail server is on a DNSBL? Regards Frog ... From: Carlos Williams To: postfix-users@postfix.org Sent: Tuesday, 1
              Message 6 of 17 , Dec 1, 2009
                Perhaps your mail server is on a DNSBL?

                Regards
                Frog


                ----- Original Message -----
                From: "Carlos Williams" <carloswill@...>
                To: postfix-users@...
                Sent: Tuesday, 1 December, 2009 4:05:25 PM
                Subject: Re: What Is Causing This Failure

                On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt
                <Ralf.Hildebrandt@...> wrote:
                > What is the output of traceroute 198.186.193.20 ?

                I get no results from my mail server:

                traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets
                1 * * *
                2 * * *
                3 * * *
                4 * * *
                5 * * *
                .
                .
                .
                29 * * *
                30 * * *

                Strange...
              • Martijn de Munnik
                ... Nope, this is a problem at the ip level, routing. This is not a postfix or mail/smtp issue.
                Message 7 of 17 , Dec 1, 2009
                  On Tue, 2009-12-01 at 16:27 +0000, Frog wrote:
                  > Perhaps your mail server is on a DNSBL?
                  >
                  > Regards
                  > Frog

                  Nope, this is a problem at the ip level, routing. This is not a postfix
                  or mail/smtp issue.

                  > ----- Original Message -----
                  > From: "Carlos Williams" <carloswill@...>
                  > To: postfix-users@...
                  > Sent: Tuesday, 1 December, 2009 4:05:25 PM
                  > Subject: Re: What Is Causing This Failure
                  >
                  > On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt
                  > <Ralf.Hildebrandt@...> wrote:
                  > > What is the output of traceroute 198.186.193.20 ?
                  >
                  > I get no results from my mail server:
                  >
                  > traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets
                  > 1 * * *
                  > 2 * * *
                  > 3 * * *
                  > 4 * * *
                  > 5 * * *
                  > .
                  > .
                  > .
                  > 29 * * *
                  > 30 * * *
                  >
                  > Strange...
                  >
                • Terry L. Inzauro
                  ... why all the off topic posts today? ... chances are a router along the way is not forwarding icmp probes/responses correctly...... [10:39:23
                  Message 8 of 17 , Dec 1, 2009
                    Frog wrote:
                    > Perhaps your mail server is on a DNSBL?
                    >
                    > Regards
                    > Frog
                    >
                    >
                    > ----- Original Message -----
                    > From: "Carlos Williams" <carloswill@...>
                    > To: postfix-users@...
                    > Sent: Tuesday, 1 December, 2009 4:05:25 PM
                    > Subject: Re: What Is Causing This Failure
                    >
                    > On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt
                    > <Ralf.Hildebrandt@...> wrote:
                    >> What is the output of traceroute 198.186.193.20 ?
                    >
                    > I get no results from my mail server:
                    >
                    > traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets
                    > 1 * * *
                    > 2 * * *
                    > 3 * * *
                    > 4 * * *
                    > 5 * * *
                    > .
                    > .
                    > .
                    > 29 * * *
                    > 30 * * *
                    >
                    > Strange...
                    >

                    why all the off topic posts today?


                    -----------------------

                    chances are a router along the way is not forwarding icmp probes/responses correctly......

                    [10:39:23 root@allover:~]# tcptraceroute 198.186.193.20 25
                    Selected device eth0, address 10.123.0.250, port 56230 for outgoing packets
                    Tracing the path to 198.186.193.20 on TCP port 25 (smtp), 30 hops max
                    1 10.123.0.252 0.302 ms 0.133 ms 0.128 ms
                    2 bizXX.sta.linkcity.org.XX.22.72.in-addr.arpa (72.22.XX.XX) 0.412 ms 0.315 ms 0.312 ms
                    3 10.200.100.1 6.961 ms 0.499 ms 0.474 ms
                    4 sl-gw16-kc-3-1.sprintlink.net (160.81.151.109) 0.564 ms 0.437 ms 0.491 ms
                    5 sl-crs1-kc-0-5-0-0.sprintlink.net (144.232.11.152) 1.073 ms 0.827 ms 0.737 ms
                    6 sl-crs1-chi-0-1-0-3.sprintlink.net (144.232.18.214) 12.008 ms 12.409 ms 11.996 ms
                    7 sl-st20-chi-13-0-0.sprintlink.net (144.232.20.3) 11.603 ms 11.579 ms 11.569 ms
                    8 144.232.8.114 11.715 ms 11.777 ms 11.657 ms
                    9 ae-32-52.ebr2.Chicago1.Level3.net (4.68.101.62) 12.476 ms 21.324 ms 18.234 ms
                    10 ae-5.ebr2.Chicago2.Level3.net (4.69.140.194) 12.354 ms 12.639 ms 12.676 ms
                    11 ae-2-2.ebr2.Washington1.Level3.net (4.69.132.70) 33.594 ms 33.414 ms 33.252 ms
                    12 ae-62-62.csw1.Washington1.Level3.net (4.69.134.146) 46.577 ms 39.840 ms 35.910 ms
                    13 ae-1-69.edge2.Washington4.Level3.net (4.68.17.19) 33.635 ms 33.585 ms 33.636 ms
                    14 xe-0-2-0.cr1.iad1.us.nlayer.net (4.79.168.74) 33.761 ms 33.292 ms 73.096 ms
                    15 vl74.ar1.iad1.us.nlayer.net (69.31.31.190) 33.976 ms 33.986 ms 34.315 ms
                    16 as6450.vl134.ar1.iad1.us.nlayer.net (69.31.31.115) 33.968 ms 33.436 ms 33.511 ms
                    17 dns5.docforge.org (198.186.193.20) [open] 33.906 ms 33.987 ms 34.153 ms
                    [10:39:25 root@allover:~]#
                  • Carlos Williams
                    On Tue, Dec 1, 2009 at 11:42 AM, Terry L. Inzauro ... I suspected this to be Postfix or Mail related so I posted here. It was determined with the help of the
                    Message 9 of 17 , Dec 1, 2009
                      On Tue, Dec 1, 2009 at 11:42 AM, Terry L. Inzauro
                      <tinzauro@...> wrote:
                      >
                      > why all the off topic posts today?

                      I suspected this to be Postfix or Mail related so I posted here. It
                      was determined with the help of the list it was not a MTA issue.
                      Simple as that!

                      Sorry for any inconvenience.
                    • Stan Hoeppner
                      ... Definitely a network problem between you and the remote host. Works fine here in the US: greer:/etc/postfix# ping 198.186.193.20 PING 198.186.193.20
                      Message 10 of 17 , Dec 1, 2009
                        Carlos Williams put forth on 12/1/2009 9:32 AM:

                        > I am unable to connect via Telnet so it appears to be a network / ISP issue.
                        >
                        > carlos@tunafish:~$ telnet 198.186.193.20 25
                        > Trying 198.186.193.20...
                        > telnet: Unable to connect to remote host: No route to host

                        Definitely a network problem between you and the remote host. Works
                        fine here in the US:

                        greer:/etc/postfix# ping 198.186.193.20
                        PING 198.186.193.20 (198.186.193.20) 56(84) bytes of data.
                        64 bytes from 198.186.193.20: icmp_seq=1 ttl=51 time=79.1 ms
                        64 bytes from 198.186.193.20: icmp_seq=2 ttl=51 time=78.9 ms
                        64 bytes from 198.186.193.20: icmp_seq=3 ttl=51 time=78.7 ms
                        64 bytes from 198.186.193.20: icmp_seq=4 ttl=51 time=78.7 ms
                        ^C
                        --- 198.186.193.20 ping statistics ---
                        4 packets transmitted, 4 received, 0% packet loss, time 3012ms
                        rtt min/avg/max/mdev = 78.729/78.883/79.151/0.263 ms

                        greer:/etc/postfix# telnet 198.186.193.20 25
                        Trying 198.186.193.20...
                        Connected to 198.186.193.20.
                        Escape character is '^]'.
                        220 share.docforge.org ESMTP Postfix
                        quit
                        221 2.0.0 Bye

                        --
                        Stan
                      • Stan Hoeppner
                        ... Try: traceroute -N 1 198.186.193.20 Debian 5.0.3 traceroute defaults to 16 simultaneous probes. Other OSes may bulk up as well. I initially had the same
                        Message 11 of 17 , Dec 1, 2009
                          Carlos Williams put forth on 12/1/2009 10:05 AM:
                          > On Tue, Dec 1, 2009 at 10:43 AM, Ralf Hildebrandt
                          > <Ralf.Hildebrandt@...> wrote:
                          >> What is the output of traceroute 198.186.193.20 ?
                          >
                          > I get no results from my mail server:
                          >
                          > traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets
                          > 1 * * *
                          > 2 * * *
                          > 3 * * *
                          > 4 * * *
                          > 5 * * *
                          > .
                          > .
                          > .
                          > 29 * * *
                          > 30 * * *
                          >
                          > Strange...

                          Try:

                          traceroute -N 1 198.186.193.20

                          Debian 5.0.3 traceroute defaults to 16 simultaneous probes. Other OSes
                          may bulk up as well. I initially had the same problem as you. Using -N
                          1 sends one probe at a time, and works for me:

                          greer:/etc/postfix# traceroute 198.186.193.20
                          traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets
                          1 . (192.168.100.1) 0.880 ms 1.143 ms 1.388 ms
                          2 mo-65-41-216-193.sta.embarqhsd.net (65.41.216.193) 36.706 ms
                          38.327 ms 40.772 ms
                          3 mo-69-68-110-209.sta.embarqhsd.net (69.68.110.209) 42.654 ms
                          45.076 ms 47.070 ms
                          4 (206.51.71.197) 80.981 ms 83.123 ms 84.785 ms
                          5 bb-dllstx37-jx9-02-xe-11-1-0.core.centurytel.net (206.51.69.25)
                          87.971 ms * *
                          6 * * *
                          7 * * *
                          8 * * *
                          9 * * *
                          10 * * *
                          11 * * *
                          12 * * *
                          13 * * *
                          14 * * *
                          15 * * *
                          16 * * *
                          17 * * *
                          18 * * *
                          19 * * *
                          20 * * *
                          21 * * *
                          22 * * *
                          23 * * *
                          24 * * *
                          25 * * *
                          26 * * *
                          27 * * *
                          28 * * *
                          29 * * *
                          30 * * *

                          greer:/etc/postfix# traceroute -N 1 198.186.193.20
                          traceroute to 198.186.193.20 (198.186.193.20), 30 hops max, 40 byte packets
                          1 . (192.168.100.1) 0.503 ms 0.502 ms 0.463 ms
                          2 mo-65-41-216-193.sta.embarqhsd.net (65.41.216.193) 38.047 ms
                          35.821 ms 35.869 ms
                          3 mo-69-68-110-209.sta.embarqhsd.net (69.68.110.209) 35.522 ms
                          35.837 ms 35.682 ms
                          4 (206.51.71.197) 67.361 ms 66.997 ms 67.789 ms
                          5 bb-dllstx37-jx9-02-xe-11-1-0.core.centurytel.net (206.51.69.25)
                          68.497 ms 68.432 ms 67.764 ms
                          6 bb-dllstx37-jx9-01-ae0.core.centurytel.net (206.51.69.57) 67.016 ms
                          66.762 ms 72.675 ms
                          7 * * *
                          8 po3-30g.ar1.dfw1.us.nlayer.net (69.31.63.154) 69.074 ms 69.489 ms
                          69.022 ms
                          9 te4-1.ar1.iah1.us.nlayer.net (69.22.142.113) 73.907 ms 73.942 ms
                          74.405 ms
                          10 xe-2-2-0.cr1.atl1.us.nlayer.net (69.22.142.118) 73.474 ms 73.845
                          ms 74.193 ms
                          11 xe-0-1-0.cr2.iad1.us.nlayer.net (69.22.142.106) 79.535 ms 80.066
                          ms 80.077 ms
                          12 vl72.ar1.iad1.us.nlayer.net (69.31.31.158) 79.094 ms 80.838 ms
                          79.838 ms
                          13 as6450.vl134.ar1.iad1.us.nlayer.net (69.31.31.115) 79.145 ms
                          81.074 ms 80.578 ms
                          14 dns5.docforge.org (198.186.193.20) 80.306 ms !X 80.124 ms !X
                          81.516 ms !X

                          man traceroute

                          -N squeries

                          Specifies the number of probe packets sent out simultaneously.
                          Sending several probes concurrently can speed up traceroute
                          considerably. The default value is 16. Note that some routers and hosts
                          can use ICMP rate throttling. In such a situation specifying too large
                          number can lead to loss of some responses.

                          --
                          Stan
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