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MH Frequently Asked Questions (FAQ) with Answers
Section - 06.06 Fixing "post: unexpected response; [BHST] no socket opened"

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Date: Mon, 1 Aug 1994 00:00:00 -0800

  This problem happens when there is no interface defined within the
  tcp system.  A couple of workarounds include:

  o Use a hostname (other than the local host) instead of localhost in
    the "servers" entry of the $MHLIB/mts.conf (mtstailor) file.
  o Recompile MH with sendmail instead of sendmail/smtp (not very
    elegant).

  A better fix would be to define your tcp interface.

  Here, you run ifconfig and route (as root) to define the loopback
  device and route. You should add them to rc.local so they are
  effected at every boot.

    # ifconfig lo 127.0.0.1			# Linux
    # ifconfig lo0 127.0.0.1		# Sun

    # route 127.0.0.1

  If all is well, "ifconfig lo" (or lo0), will show something like
  this (on my Linux system):

    lo        Link encap Local Loopback
	      inet addr 127.0.0.1  Bcast 127.255.255.255  Mask 255.0.0.0
	      UP LOOPBACK RUNNING  MTU 2000  Metric 0
	      RX packets 0 errors 0 dropped 0 overrun 0
	      TX packets 519 errors 0 dropped 0 overrun 0

  and "netstat -r" will show:

    # netstat -r
    Destination net/address   Gateway address    Flags RefCnt    Use Iface
    127.0.0.0                 *                  UN         0    519 lo

  If you're not on a network and running DNS, your /etc/hosts will
  need at least:

    127.0.0.1	your_host_name localhost 	# loopback address

  Note: put your name FIRST on the localhost line. This official name
  is used by sendmail to determine your return address.

  If you are on a network and running DNS, you might find that putting
  your host name in the localhost entry might gum up other things, in
  which case you'll want your hostname to have its own proper address.

  This might not do it though. David Youatt <dpy at sgi.com> says that
  his network was happy but he still had the problem until he upgraded
  his system and got the latest revision of sendmail as well. He says:
  "Turns out that that the problem I was having seems to be caused (at
  least partly, maybe entirely) by the version of sendmail that is
  shipped with IRIX 5.2 (sendmail 5.65, I think). The version shipped
  w/IRIX 5.3 (in beta) is sendmail 8.6.9 and works fine."

  I'm not entirely happy with this section, so please give me some
  feedback. If you have this problem, please send me <wohler at
  newt.com> a brief description so I'll know which problems and
  solutions seem to be the most prevalent.

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Top Document: MH Frequently Asked Questions (FAQ) with Answers
Previous Document: 06.05 Fixing "post: problem initializing server; [RPLY] 503 Sender already specified"
Next Document: 06.07 How do I fix the "X-Authentication-Warning" header?

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Send corrections/additions to the FAQ Maintainer:
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Last Update March 27 2014 @ 02:11 PM