Windows 2008 firewall allow telnet

If Server A is on a different network than the 3 other servers that you've used to telnet into Server B with then it's not really a valid test of connectivity.

There could still be firewall rules or router ACL's that prevent connections from Server A's network. Keep in mind that your outgoing traffic from Server A is actually only destined for port The source port will be something different. If this does not resolve the problem I recommend something like wireshark to really see what is going on. What's different about the three servers that work and Server A that doesn't?

Any chance Server B is accepting connections only from certain subnets, for instance? If that works, I'd ask if their support could help you test by setting another of their servers briefly to listen on - Google "port listener" for examples of free software if they don't have their own.

Once that works, and you've checked that Server B sees inbound connections on other ports from Server A, you'd have some evidence to bring to the Server A hosting support staff. Does server B have more than one external IP address?

Ping from server A and ensure it resolves to the same IP address as your other 3 servers are resolving it to. Can you telnet from Server A to any external port greater than on which an external host is listening and permitting to telnet from other hosts? I believe that default Windows Server have such communications to ports greater than closed. If the user does not have this permission to connect, then it is not possible to connect to an instance of SQL Server through Named Pipes unless either guest account on the computer is enabled disabled by default , or the permission "access this computer from the network" is granted to user account.

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Asked 11 years, 5 months ago. Active 10 years, 5 months ago. Viewed 8k times. To actually use the telnet server, you need to, minimally, 1 start the service and 2 allow access. Change the telnet service to start automatically and then go ahead and Start the service.

Figure 5. By the way, you can also start and stop your telnet server from a command prompt by using net start telnet and net stop telnet. At this point, you can telnet to your server and get a login prompt.

You can login as administrator but no other non-administrative users can login. To allow other users to login, we need to configure who is authorized to login via telnet. To do this, you need to add the non-administrative user to the Local Group called TelnetClients. So, if the group is not created on your system, go ahead and create the group. Next, Add Users to this group. Figure 6. Prior to using telnet on this machine, I had to install the telnet client feature which was similar to installing the telnet server feature in Windows Server.

At the Windows command prompt, I telnetted to my new Telnet Server and was able to successfully connect, as a non-administrative user notice the username I logged in with , as you can see below in Figure :. Figure 7. View this "Best Answer" in the replies below ». Which of the following retains the information it's storing when the system power is turned off? Submit ». Pure Capsaicin. Gary D Williams This person is a verified professional. In order to view the Windows Firewall, you will want to get into the Server Manager.

When Server Manager starts, it will look like Figure 1. Now that you are in Server Manager, you can find the Windows Firewall by opening the Configuration node, then selecting the Windows Firewall with Advanced Security node. After selecting these nodes, you should see a window similar to that in Figure 2. Figure 2: Windows Firewall with Advanced Security interface.

One of the biggest changes that Microsoft has made to the Windows Firewall over the years is to integrate the firewall settings with IP Security settings. IP Security is one of the most powerful technologies that is around to help protect local computers. IP Security provides options for specifying which computers or networks can communicate with other computers or networks. The options are very granular and IP Security also includes the ability to encrypt the data communications.

In addition to IP Security being integrated with the firewall, there is a new summary interface and wizard to help create your firewall rules. You can create Inbound rules, Outbound rules, and Connection Security rules. Inbound and outbound rules seem pretty obvious.