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You can set this value by using the Group Policy setting, Group Policy slow link detection. If it takes longer than 2000 milliseconds it is considered a slow link. If it takes less than 2000 milliseconds (two seconds), then it is considered a fast link. By default, the fast or slow status of a link is based on a test ping to the server. A LAN enables any connected device to interact with any other on the network. * A remote access connection is not necessarily a slow link, nor is a local area network (LAN)Ī communications network connecting a group of computers, printers, and other devices located within a relatively limited area (for example, a building). Lies! Conflicting information about what constitutes a slow link. If necessary, you might also want to adjust which Group Policy extensions are processed below this threshold however, it might be more appropriate to place a local domain controller at that location. You can change the slow link threshold by using the Group Policy Slow Link Detection policy for both the user and computer aspects of a GPO. All other Group Policy settings, including software distribution and Folder Redirection, are not applied by default however, you can modify this behavior by using policy. If the network link speeds between a client and the authenticating domain controller fall below the slow-link threshold, (by default 500 kilobits per second), only the administrative template (registry) settings and security settings are applied. That has helped a great deal.ĭomain controller placement is an issue when slow links are involved. I've got all my hosts (all servers, all clients) switched to use TCP for Kerberos. It's working fine now, but only after I've spent countless sleepless nights and hours on hold with tech support, or waiting for them to call me back. I could ping anything through the tunnel, resolve names, latency was low but we've had UDP traffic issues and we've had MTU issues, among other things. We are using a proprietary VPN solution provided by our firewall manufacturer, and we've had numerous VPN problems in the past. Every VPN implementation seems to be different. Even temporarily, just to see if your problems are going to go away. If you are using hardware appliances to create the VPN tunnel, consider using two Windows servers with dual NICs. Or you could try to fix it yourself, but you'll probably have to do a lot of experimenting and trial-and-error configuration changes on the live VPN tunnel. They've probably seen it before and could help you. Instead of trying to switch everything to TCP you should contact the VPN provider (Cisco PIXes on both ends? Or MS servers? Or something else?) and explain the problem. The problems caused by that are usually authentication related, as Kerberos is using UDP (by default). UDP traffic getting hammered in the VPN tunnel is very common.
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