Tips to Troubleshoot Windows Vista Networking Issues. Introduction. In this article, I will cover 5 things you can do to troubleshoot your Windows Vista networking issues; including automated diagnoses, command line tools, and a strong troubleshooting methodology. Windows Vista is no different than any other operating system in that, sooner or later, you will have networking issues. This could be caused by the OS (Vista in this case), misconfiguration by the user or IT Admin, network issues, or other causes. Thus, it is not a question of if you will need to perform Vista network troubleshooting, it is a question of when will you need to perform Vista network troubleshooting. In this article, I will walk you through my 5 tips that I recommend you use to troubleshoot Windows Vista networking issues. Let us start with the first tip.#1: Use the Bottom Up Approach. I recall reading my first Cisco networking book and learning about the 3 different approaches to network troubleshooting (see my article How to use the OSI Model to Troubleshoot Networks). The 3 approaches to network troubleshooting are the bottom/up, top/down, and divide & conquer models. In the case of Vista Network troubleshooting, my #1 tip is to use the “bottom up approach” to network troubleshooting to attempt to solve your network issue prior to going into real “vista OS” troubleshooting. So what is the “bottom up approach”? If you look at the OSI Model, you will see that it is a layered model that represents all the different parts which make up a network. The “bottom” layer is usually the physical layer. Think of physical layer as the cabling, NIC interfaces, switches, and electric signals that go across the wire. If you start your troubleshooting at that bottom layer (the physical layer) and move up the OSI model you will go through the Data- Link layer (usually the Ethernet protocol), the Network Layer (usually the IP Network), Transport Layer (TCP), and all the way up to the Application layer (layer 1). My point is to start your troubleshooting by checking for physical connectivity. Here are some questions to ask yourself: Is my network cable connected? Do I have a link light on the NIC? Does Windows see my NIC and see it as connected? Does the Ethernet switch have power and show a link light? Whether you have a wired or wireless connection, the questions are the same (or similar). Take for example this Vista Wireless network connection status: Figure 1: Vista Wireless Connection Status. You want to look at the “media state”. In this case, the media is wireless but the important thing is that it is enabled. If you are attempting to connect to a wireless network, make sure that you are actually connected to a network. You can click on Connect to a Network to either connect or disconnect from a wireless or dialup network. On a computer with a physical Ethernet connection, you are going to look for the same thing. Take for example this Windows 2. Server with an Ethernet NIC: Figure 2: Windows 2. Media Stat. On this server, you can see that the Ethernet media on the wired LAN connection is enabled and you can see that the speed is 1. Gbps. If you can verify these things, more on up the OSI model until you find the issue. The old network admin joke about the OSI model is that the non- existent 8th layer of the model is the “end user” and that they are many time the issue. Many of these other things will fall into the category of testing various layers of the OSI model but, as with most networking tools, they apply to the testing of the Network & Transport layers which cover TCP/IP.#2: IP Addressing. Let us say that you checked your media state and your link light and you have physical network connectivity. Moving on up the OSI model, we will skip the datalink layer (layer 2) as Ethernet MAC addressing is usually not an issue and move to IP addressing (layer 3). At this point, you need to check your IP addressing in to ensure that: You have a real IP address (not an automatically assigned IP address)Your IP address is correct and matches your network & default gateway addresses. You have default gateway and DNS Server IP addresses defined. To do this, open the Network and Sharing Center and assuming you have a connection, click on the View Status for your connected network interface. Figure 3: Viewing the Status of your Connection. Then click on Details to see the IP address, subnet mask, default gateway, and DNS Servers. If you take a look at the details for the connection in Figure 4, notice that this connection has no default gateway or DNS servers. Figure 4: Connection without a default gateway or DNS Servers. Lack of these will certainly prevent you from really using your network connection as normal. Of course, neither of these are required but most of us want to communicate outside of our local LAN. A default gateway is required for that. Also, most of us want to communicate with servers by name (such as using www. DNS Server IP’s are required for that. Of course, you can also do an IPCONFIG /ALL to check all your IP settings, like this: Figure 5: Results of IPCONFIG /ALLPerhaps you did not receive these settings because your adaptor is not using DHCP. Even if you do have a valid IP address, default gateway, and DNS Servers, you should ping these to ensure that you can really communicate with them.#3: Windows Vista Diagnose and Repair. Fortunately for those who do not want to get into troubleshooting, Vista does offer the automatic Diagnose and Repair of network connections. Us IT Adminstrators can also use this as the “shotgun approach” to solving our problem quicker without getting into trying all sorts of things. To use diagnose and repair, just open the Network and Sharing Center and click on Diagnose and Repair. Figure 6: Diagnose and Repair. Note: Vista help also calls diagnose and repair “Network Diagnostics”. Facing Windows network or internet connectivity problems? If you find that your internet connection has stopped working try these troubleshooting steps. The transparent glass look of Aero Glass in Windows 7 and Vista may look nice, but it also may slow down computers that don’t have powerful video adapters. Windows Vista introduced a number of new I/O functions to the Microsoft Windows line of operating systems. They are intended to shorten the time taken to boot the.
This tool will go through and check your network connection to identify problems. Firewalls are used to filter inbound and outbound network connections. Firewalls could be local on your Vista computer or they could be out on the network, filtering inbound or outbound connections to/from the Internet. Of course if the firewall is out on our LAN that is beyond the scope of this article. As for firewalls on your local Vista computer, you can even have more than one but the first one (if you installed a 3rd party firewall). However, the first thing that you want to check is the Windows Vista Firewall that is installed and enabled by default. It is unlikely that the Vista Firewall is blocking all network access. It is more likely that it is blocking just certain inbound or outbound network connections for specific applications. While it is risky on a public shared network to disable your firewall, one of the first things that I usually do when I get to this point is to just turn off the Vista Firewall to see if your problem is resolved. If it is, you can re- enable the Vista Firewall and then troubleshoot it to determine what port you need to allow your network traffic through. To disable or add exceptions for the Windows Firewall, just click on Windows Firewall inside the Network and Sharing Center. At this point, you can view its status. Figure 7: Checking the Windows Firewall. We can see that the Windows Firewall is enabled and that means that inbound connections that do not have an exception will be blocked. We can see that we should get a notification when a program is blocked. To try disabling the firewall or creating an exception, click Change Settings and you will see this: Figure 8: Changing Windows Firewall Settings. Here you can turn the firewall Off, view/modify exceptions with the Exceptions tab, or look at advanced features. Besides the Windows Firewall, if you are having trouble accessing computers on your local network, you need to check your Network Discovery settings. To do this, go to Network and Sharing. Center and scroll down to the Sharing and Discovery section. Check your settings for things like Network Discovery, File Sharing, and others. Figure 9: Sharing and Discovery#5: Use Common Sense Network Troubleshooting. While I have offered a number of technical troubleshooting tools, one of the things that more often than not is missed, is just using what I call “common sense” when it comes to troubleshooting network issues. Here are some common sense tips: Did you or someone else change something that could have caused this new networking issue? Are you even connected to the network? Are you assuming that all network connectivity is lost when really it is just one server or application that is not functioning? And if you change one thing that does not fix your issue, change that thing back to where it was before changing something else. Conclusion. You WILL be troubleshooting Vista Networking issues if you use Vista. It is not a matter of “if” but a matter of “when”. I recommend that you keep these 5 Tips to Troubleshoot Windows Vista Networking Issues handy for the next time you have a Vista networking issue.
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