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PostPosted: Thu Nov 17, 2011 1:38 pm 
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In the last few weeks, I've noticed an issue that I can't seem to put my finger to. A couple weeks ago, I was remoted into my WHS 2011 box via remote desktop, and I rebooted it. Since the server was sitting a few feet away, the health light turning solid was a visual cue that the server was booted back up. When I tried to remote back into it, I got this error message: "Your computer could not connect to another console session on the remote computer because you already have a console session in progress."

I googled and dug around, but to make an extremely long story really, really short, the problem was this. If I pinged the server's name (HUNKAHUNKASLAB), the response I got back was 127.0.0.1. In other words, the desktop was trying to connect to itself! The response I should have gotten was 192.168.1.79--the IP address this server has had for over 2 months, even after several reboots.

Today I rebooted a virtual machine, named PARIETALBONE, because it was set to NAT and not direct connection. When I pinged PARIETALBONE from my work laptop (MSAWYER6), the response I got back was 127.0.0.1! PARIETALBONE uses WHS 2011 for backups, but when I used Remote Access on the WHS 2011 box and tried connecting to PARIETALBONE, the desktop for HUNKAHUNKASLAB (the WHS 2011 server) appeared. And so I remoted into WHS 2011 and pinged PARIETALBONE. 127.0.0.1 was the response!

Running commands such as ipconfig /flushdns, nbtstat -R and even restarting the dnscache (DNS Client) service does NOT fix the problem. Creating a HOSTS file entry or rebooting the machine seems to be the only answer.

If I ping a machine I know does not exist (i.e. HELLOWORLD) on my home network, I get the response that "Ping request could not find the host name." This is an expected response. But if a machine that was on the network drops off for a little bit (i.e. a reboot), why would ping requests to that machine report back 127.0.0.1 ???

If I connect to http://192.168.1.254 (the 2WIRE AT&T U-verse router), the machine shows up there as online and has the CORRECT IP address. And all of the computers show 192.168.1.254 as the default gateway AND as the DNS server. The router model is 2WIRE 3800HGV-B.

Did a recent Windows Update bring this about? This is very annoying. I don't like having all these HOSTS file entries, as doing this on multiple systems is just not a good practice.

EDIT: This problem is appearing on my computers running Windows 7 (one Ultimate, one Enterprise), Windows Server 2008 R2 and WHS 2011. I have not yet noticed if it appears on my WHS v1 box or a virtual machine running Server 2003.

EDIT #2: I tried disabling NetBIOS lookups, LMHOSTS lookups and IPv6. None of these fixed the problem.

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HP EX490, 4GB, E5300, 15TB - Server 2012 - Sharing and Streaming
HP EX487, 4GB, E5300, 13TB - Server 2012 Essentials - Backups


Last edited by msawyer91 on Thu Nov 17, 2011 4:23 pm, edited 2 times in total.

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PostPosted: Thu Nov 17, 2011 3:46 pm 
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Some additional information may prove helpful. I decided to ping the machine PARIETALBONE from my personal laptop. Here's what I get back. I also did a route print, which I found in this article (it's old, but describes the same problem): http://www.computing.net/answers/window ... 72249.html

Code:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Windows\system32>ping parietalbone

Pinging parietalbone.gateway.2wire.net [127.0.0.1] with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Ping statistics for 127.0.0.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Windows\system32>route print
===========================================================================
Interface List
 11...98 4b e1 a1 17 8f ......Realtek PCIe GBE Family Controller
 14...e0 2a 82 ca 9e bd ......Bluetooth Device (Personal Area Network)
  1...........................Software Loopback Interface 1
 12...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter
 19...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
 18...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0    192.168.1.254     192.168.1.89     10
        127.0.0.0        255.0.0.0         On-link         127.0.0.1    306
        127.0.0.1  255.255.255.255         On-link         127.0.0.1    306
  127.255.255.255  255.255.255.255         On-link         127.0.0.1    306
      192.168.1.0    255.255.255.0         On-link      192.168.1.89    266
     192.168.1.89  255.255.255.255         On-link      192.168.1.89    266
    192.168.1.255  255.255.255.255         On-link      192.168.1.89    266
        224.0.0.0        240.0.0.0         On-link         127.0.0.1    306
        224.0.0.0        240.0.0.0         On-link      192.168.1.89    266
  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306
  255.255.255.255  255.255.255.255         On-link      192.168.1.89    266
===========================================================================
Persistent Routes:
  None

IPv6 Route Table
===========================================================================
Active Routes:
 If Metric Network Destination      Gateway
 19     58 ::/0                     On-link
  1    306 ::1/128                  On-link
 19     58 2001::/32                On-link
 19    306 2001:0:4137:9e76:3c80:1e42:9cf8:b184/128
                                    On-link
 11    266 fe80::/64                On-link
 19    306 fe80::/64                On-link
 19    306 fe80::3c80:1e42:9cf8:b184/128
                                    On-link
 11    266 fe80::c9a8:4a34:a27b:ce9/128
                                    On-link
  1    306 ff00::/8                 On-link
 19    306 ff00::/8                 On-link
 11    266 ff00::/8                 On-link
===========================================================================
Persistent Routes:
  None

C:\Windows\system32>


If I remote into the WHS 2011 box, which has only a single network connection (you probably noticed above the laptop has a wired connection to the primary network and a wireless connection to the development/test network I have at home). Here are the results from the WHS 2011 box (an EX487):

Code:
C:\Users\Administrator>ping parietalbone

Pinging parietalbone.gateway.2wire.net [127.0.0.1] with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Ping statistics for 127.0.0.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Users\Administrator>route print
===========================================================================
Interface List
 11...00 0a e4 89 e1 96 ......Realtek PCIe GBE Family Controller
  1...........................Software Loopback Interface 1
 13...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter
 12...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0    192.168.1.254     192.168.1.79     10
        127.0.0.0        255.0.0.0         On-link         127.0.0.1    306
        127.0.0.1  255.255.255.255         On-link         127.0.0.1    306
  127.255.255.255  255.255.255.255         On-link         127.0.0.1    306
      192.168.1.0    255.255.255.0         On-link      192.168.1.79    266
     192.168.1.79  255.255.255.255         On-link      192.168.1.79    266
    192.168.1.255  255.255.255.255         On-link      192.168.1.79    266
        224.0.0.0        240.0.0.0         On-link         127.0.0.1    306
        224.0.0.0        240.0.0.0         On-link      192.168.1.79    266
  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306
  255.255.255.255  255.255.255.255         On-link      192.168.1.79    266
===========================================================================
Persistent Routes:
  None

IPv6 Route Table
===========================================================================
Active Routes:
 If Metric Network Destination      Gateway
 12     58 ::/0                     On-link
  1    306 ::1/128                  On-link
 12     58 2001::/32                On-link
 12    306 2001:0:4137:9e76:306c:17ce:9cf8:b184/128
                                    On-link
 11    266 fe80::/64                On-link
 12    306 fe80::/64                On-link
 12    306 fe80::306c:17ce:9cf8:b184/128
                                    On-link
 11    266 fe80::d8fe:3303:100f:a92/128
                                    On-link
  1    306 ff00::/8                 On-link
 12    306 ff00::/8                 On-link
 11    266 ff00::/8                 On-link
===========================================================================
Persistent Routes:
  None

C:\Users\Administrator>


The 192.168.1.254 identified as the Gateway in the IPv4 table for both computers is the IP of the 2WIRE router, or what AT&T U-verse calls the Residential Gateway. If I pull up the website for that device (http://192.168.1.254), I very clearly see the machine PARIETALBONE as being online, with a DHCP IP of 192.168.1.81. And since 192.168.1.254 is the sole DNS server for both of these computers, WHERE is Windows coming up with 127.0.0.1 when the DNS server (the Residential Gateway) very clearly shows 192.168.1.81 is the IP address of PARIETALBONE?

_________________
Matt Sawyer
Owner, Dojo North Software, LLC

HP EX490, 4GB, E5300, 15TB - Server 2012 - Sharing and Streaming
HP EX487, 4GB, E5300, 13TB - Server 2012 Essentials - Backups


Last edited by msawyer91 on Thu Nov 17, 2011 4:24 pm, edited 1 time in total.

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PostPosted: Thu Nov 17, 2011 4:22 pm 
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I think the problem may be solved. I have several network utilities on my iPhone, so I decided to ping PARIETALBONE from my iPhone. Why not rule out Windows as the guilty party? Sure enough, 127.0.0.1 was the result! So that effectively lets Microsoft off the hook.
Attachment:
File comment: iPhone ping of Parietal Bone.
ParietalBone.png
ParietalBone.png [ 105.49 KiB | Viewed 2695 times ]

And so I decided to poke around on problems with 2WIRE and/or U-verse and 127.0.0.1. And I found some forum hits. Here were two that really stuck out:

http://www.dslreports.com/forum/r263937 ... 3800HGV-B-
http://arstechnica.com/civis/viewtopic. ... &t=1157167

Interestingly, these posts seemed to focus on two things. A 2WIRE residential gateway model 3800HGV-B with firmware version 6.3.7.42-plus.tm. I checked mine. Model 3800HGV-B? Check. Firmware version 6.3.7.42-plus.tm? Check.

Sadly, the resolution seemed to be to perform a factory reset. This obliterates all stored settings, included port forwarding (I have dozens), password, wireless configuration, etc. Performing a simple reboot (including an unplugging of the power cord) did not resolve the problem.
However, some folks suggested trying the simpler, less destructive "clear device" approach, followed by a reboot. I tried this, and it seems to have worked!

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Matt Sawyer
Owner, Dojo North Software, LLC

HP EX490, 4GB, E5300, 15TB - Server 2012 - Sharing and Streaming
HP EX487, 4GB, E5300, 13TB - Server 2012 Essentials - Backups


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PostPosted: Fri Nov 18, 2011 1:33 pm 
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I have to admit I was stumped, though it did sound like a DNS issue which would have been performed by your router. Glad you got it working, at least for now, thanks for sharing the solution. :mss:

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PostPosted: Sun Nov 20, 2011 3:55 pm 
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Thanks Alex. Unfortunately it did clear all of my firewall (port forward settings). I didn't realize this right away. I left for deer hunting Friday night and yesterday my mom called trying to access my SharePoint server (she has a site on it), and couldn't. Today I checked and saw all my port forwarding settings were gone.

Fortunately the custom applications (names, ports) were still defined, so I just had to reassign them to their targets.

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Matt Sawyer
Owner, Dojo North Software, LLC

HP EX490, 4GB, E5300, 15TB - Server 2012 - Sharing and Streaming
HP EX487, 4GB, E5300, 13TB - Server 2012 Essentials - Backups


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PostPosted: Sun Nov 20, 2011 11:46 pm 
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That's a bummer you lost all the port forwards, what a pain! I gotta say my few interactions with 2Wire have never been pleasant, I found the configuration to be super confusing. I've been very pleased with the Tomato firmware on my Linksys routers.

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