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vidually, and eliminate them from the troubleshooting equation.
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This troubleshooting stuff really works! Don t get discouraged. Keep
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plugging away if you are having problems, and make sure you work with all the tools available.
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Troubleshooting Tools
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As stated in 11, the Microsoft Windows Server 2003 family provides the fol lowing tools to troubleshoot VPN connections:
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Transmission Control Protocol/Internet Protocol (TCP/IP) troubleshooting
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tools
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Authentication and account logging Event logging Internet Authentication Services (IAS) event logging Point-to-Point Protocol (PPP) logging
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PART III
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VPN Troubleshooting
Tracing Oakley logging Network Monitor
We did an extensive overview of these tools in the previous chapter and won t repeat their uses here. For more information about these tools, see 11. One new tool you need to be aware of for site-to-site connections is the Unreach ability Reason facility, which you can use to investigate a site-to-site VPN connec tion problem. When a demand-dial interface fails to make a connection, the interface is left in an unreachable state and the Routing And Remote Access service records the reason why the connection attempt failed in the Unreachability Reason facility. Using this tool can save you a lot of time and effort, so be sure to check it for results of failures.
To view the unreachability reason tool
1. From the console tree in the Routing And Remote Access snap-in, click Network Interfaces. 2. In the details pane, right-click the demand-dial interface, and then click Unreachability Reason.
Troubleshooting Site-to-Site VPN Connections
Site-to-site VPN problems typically fall into the following categories:
Unable to connect. As with remote access, the procedures for troubleshooting the initial connection states follow the industry-standard protocols and are straight forward. The process is reiterated in this chapter so that you have in one place a clear methodology to work through to troubleshoot site-to-site connections.
Unable to reach locations beyond the VPN routers. This is where
things start to differ from remote access. In remote access, only one side of the connection needed to handle routing issues, and it was able to mandate what the client s routing looked like. In site-to-site, both sides of the connec tion are acting as routers for the sites they manage, and they both need to handle the IP routing issues. We will look at what to check to make sure routing operations are working according to specification.
Unable to reach the virtual interfaces of VPN routers. In remote
access, only the VPN server needed to deal with IP address assignment. In site-to-site, each side needs to handle security for its side of the connection, and each VPN router assigns an address to the other router.
12 Troubleshooting Site-to-Site VPN Connections |
On-demand connection is not made automatically. In site-to-site configurations, demand-dial filters determine what kind of traffic will initiate the connection created or prevent the connection from being initiated. You need to be able to troubleshoot these filters and make sure connections are being created as needed. Use the information in the following sections to isolate the configuration or infra structure issue that is causing the problem. We start with the same basic connection troubleshooting that we used in 11, so much of this material is repeated. We will, however, emphasize the distinct differences you have to watch for.
Unable to Connect
When a calling router is unable to connect, check the following items:
Using the Ping command when connected to the Internet, verify that the
host name for the answering router is being resolved to its correct IP address. Ping itself might not be successful because of packet filtering that is preventing Internet Control Message Protocol (ICMP) Echo messages being processed by the answering router.
If you are using password-based credentials, verify that the calling router s
credentials consisting of user name, password, and domain name are cor rect and can be validated by the answering router. Each side needs to main tain a set of credentials for the other. This is different than in remote access, where only one side needed to maintain a credential set.
Verify that the user account of the calling router is not locked out, expired,
or disabled, or that the time the connection is being made corresponds to the configured logon hours.
Verify that the user account of the calling router is not configured to change
its password at the next logon or that the password has not expired. A call ing router cannot change an expired password during the connection pro cess. If the password has expired or changed, the connection attempt is rejected.
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