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isa server 2004 (proxy chain loop)

Posted on 2009-04-22
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Last Modified: 2012-06-21
Event Type:      Warning
Event Source:      Microsoft ISA Server Web Proxy
Event Category:      None
Event ID:      14141
Greetings

I've installed isa server with 2 NIC

the 1 NIC
192.168.0.10
255.255.255.0
no gateway
192.168.0.4
192.168.0.80

the 2 NIC
192.168.0.11
255.255.255.0
192.168.0.1
192.168.0.4
192.168.0.80

IPv4 Route Table
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x10003 ...00 0e 2e 71 c4 7f ...... Realtek RTL8139 Family PCI Fast Ethernet NIC

0x10004 ...00 0f 1f de 27 ba ...... Broadcom NetXtreme 57xx Gigabit Controller
===========================================================================
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0      192.168.0.1     192.168.0.11     20
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1      1
      192.168.0.0    255.255.255.0     192.168.0.10     192.168.0.10     10
      192.168.0.0    255.255.255.0     192.168.0.11     192.168.0.11     20
     192.168.0.10  255.255.255.255        127.0.0.1        127.0.0.1     10
     192.168.0.11  255.255.255.255        127.0.0.1        127.0.0.1     20
    192.168.0.255  255.255.255.255     192.168.0.10     192.168.0.10     10
    192.168.0.255  255.255.255.255     192.168.0.11     192.168.0.11     20
        224.0.0.0        240.0.0.0     192.168.0.10     192.168.0.10     10
        224.0.0.0        240.0.0.0     192.168.0.11     192.168.0.11     20
  255.255.255.255  255.255.255.255     192.168.0.10     192.168.0.10      1
  255.255.255.255  255.255.255.255     192.168.0.11     192.168.0.11      1
Default Gateway:       192.168.0.1
===========================================================================

i get these errors:

Date:            22.4.2009
Time:            10:39:36
User:            N/A
Computer:      my server
Description:
ISA Server detected a proxy chain loop. There is a problem with the configuration of the ISA Server routing policy.

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Question by:RodeRidder
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4 Comments
 
LVL 10

Expert Comment

by:Kieran_Burns
ID: 24202611
both of your NICs are on the same subnet, so there is effectively two routes to any traffic on the same subnet - it can go out on one card and back in on the other.
You need to change the 192.168.0.10 interface to be on another subnet, either by changing its IP address to something outside of the 192.168.0.0/24 subnet or reduce the size of the subnet significantly.... very significantly.
What are you actually trying to achieve here, as it may be more relevant to fix that issue rather then the one listed
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Author Comment

by:RodeRidder
ID: 24202674
NIC 1 is on my internal network
NIC 2 is connected to my cisco pix router

i would like my clients to connect to the outside(internet) and my VPN clients to connect to the inside
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LVL 10

Accepted Solution

by:
Kieran_Burns earned 2000 total points
ID: 24202715
Change the NIC connected to the CISCO to be on a subnet of 192.168.1.0/24. Give that a default gateway of the Cisco INTERNAL interface (which will also need to be changed)
I suggest the following config:
Internal NIC: 192.168.0.10, no gateway,
External NIC:192.168.1.11, gateway of 192.168.1.254,
Cisco: internal NIC 192.168.1.254, External NIC of whatever it has now
That should get you routing correctly
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LVL 10

Expert Comment

by:Kieran_Burns
ID: 24202725
Oh, and subnet masks all round of 255.255.255.0
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