5 Replies Latest reply on Jul 7, 2015 3:25 PM by kwidhalm

    mxlogic.net returning "Connection Refused" errors

    campajoe15

      Hello to the community.

       

      I am a Verizon business customer, and have been assigned a static IP block which from which MX Logic refuses connections.

       

      Jun 12 16:42:55 sm-mta[12364]: t5CKgqEQ001767: to=<${_RECIPIENT}@mortgagemaster.com>, ctladdr=<${_SENDER}@backshooters.com> (1001/1001), delay=00:00:03, xdelay=00:00:01, mailer=esmtp, pri=92783, relay=mortgagemasterinc....und10.mxlogic.net. [208.65.145.3], dsn=4.0.0, stat=Deferred: Connection refused by mortgagemasterinc.com.inbound10.mxlogic.net.

       

      When I try a direct connection to mxlogic from the shell of my mail gateway, I get the same result:

       

      $ nc -vv mortgagemasterinc.com.inbound10.mxlogic.net 25

      nc: connect to mortgagemasterinc.com.inbound10.mxlogic.net port 25 (tcp) failed: Connection refused

      nc: connect to mortgagemasterinc.com.inbound10.mxlogic.net port 25 (tcp) failed: Connection refused

      nc: connect to mortgagemasterinc.com.inbound10.mxlogic.net port 25 (tcp) failed: Connection refused

      nc: connect to mortgagemasterinc.com.inbound10.mxlogic.net port 25 (tcp) failed: Connection refused

       

      Apparently, because the IPs associated to me were previously assigned as DSL by Verizon (at least according to 71.244.218.27 - IP - McAfee Labs Threat Center), but this is no longer the case.

       

      If you dig the in-addr.arpa zone for the IPs near and around the allocation I was assigned by Verizon:

       

      $ for i in `jot 255 1`; do printf "reverse dns for 71.244.218.${i}: "; dig +short -x 71.244.218.${i}; done

      reverse dns for 71.244.218.1: lo0-100.BLTMMD-VFTTP-318.verizon-gni.net.

      reverse dns for 71.244.218.2: static-71-244-218-2.bltmmd.fios.verizon.net.

      reverse dns for 71.244.218.3: static-71-244-218-3.bltmmd.fios.verizon.net.

      {...}

      reverse dns for 71.244.218.18: static-71-244-218-18.bltmmd.fios.verizon.net.

      {...}

      reverse dns for 71.244.218.26: future-71-244-218-26.fios8336.heliostream.com.

      reverse dns for 71.244.218.27: backshooters.com.

      reverse dns for 71.244.218.28: hosting.heliostream.com.

      reverse dns for 71.244.218.29: ns1.heliostream.com.

      reverse dns for 71.244.218.30: ns2.heliostream.com.

      reverse dns for 71.244.218.31: static-71-244-218-31.bltmmd.fios.verizon.net.

      reverse dns for 71.244.218.32: static-71-244-218-32.bltmmd.fios.verizon.net.

      {...}

      static-71-244-218-254.bltmmd.fios.verizon.net.

       

      The allocation for the block assigned to me is all static IPs for business customers. I have 71.244.218.16/28 which is 71.244.218.{18,19..30}.

       

      I noted that at least one other user reported a similar issue in the following thread:

       

      mxlogic.net returning "Connection Refused" errors

       

      And it was resolved by

       

      Brad McGarr

      Web Services Support Technician

      McAfee SaaS Email & Web Protection

       

      within a few days.

       

      I would appreciate if someone could do the same for me. Please feel free to contact me via the email address I registered on the forums signup, and I can provide more contact information (phone, alternate email) in order to prove that I am who I am.

       

      Much appreciated.

       

      Joe