How to configure an L2TP/IPsec server behind NAT

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INTRODUCTION Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 How to back up and restore the registry in Windows By default, Windows Vista and the Windows Server 2008 operating system do not support Internet Protocol security (IPsec) network address translation (NAT) Traversal (NAT-T) security associations to servers that are located behind a NAT device. Therefore, if the virtual private network (VPN) server is behind a NAT device, a Windows Vista-based VPN client computer or a Windows Server 2008-based VPN client computer cannot make a Layer Two...
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NTLM Windows Credential Leak

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Understanding the Windows Credential Leak Flaw and How to Prevent It By Lawrence Abrams August 5, 2016 12:48 PM 34 This week there has been a lot of news about a flaw in Windows that could be used by web sites to easily gain access to a visitor's Windows login name and password. When I tested this flaw it was downright scary.  Using a test site for this flaw, the site was able to get my test Microsoft Account login name and the hash of its password in a few seconds.  Then it took the site less than 30 seconds to crack the password! What is even scarier, is that this flaw is not new and was discovered in March 1997! Test shows my account info and PasswordYes. I changed the password already. News about this flaw was recently reported again by VPN company Perfect Private and by ValdikSS, who is affiliated with the Russian...
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Disable NetBIOS and SMB to protect public Web servers – TechRepublic

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techrepublic.com Disable NetBIOS and SMB to protect public Web servers - TechRepublic Mike Mullins Serving data to users outside of an internal network, public Web servers are typically the first point of contact for an external attack. In addition, internal networking ports are the most revealing and most often attacked ports on a server. That's why you need to make sure you've disabled the services that are specifically for intranets. The two biggest culprits that you need to worry about are the Server Message Block (SMB) protocol and NetBIOS over TCP/IP. Both services can reveal a wealth of security information and are reoccurring vectors for hacks and attacks. They're unnecessary for the operation of a public Web server, and you should take steps to shut down both services on these servers. Disable NetBIOS NetBIOS was once a useful protocol developed for nonroutable LANs. In this case, it acts as a session-layer protocol transported over TCP/IP to provide name resolution to...
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Nslookup

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Nslookup Updated: April 17, 2012 Applies To: Windows Server 2003, Windows Vista, Windows Server 2008, Windows Server 2003 R2, Windows Server 2008 R2, Windows Server 2012, Windows Server 2003 with SP1, Windows 8 Displays information that you can use to diagnose Domain Name System (DNS) infrastructure. Before using this tool, you should be familiar with how DNS works. The Nslookup command-line tool is available only if you have installed the TCP/IP protocol. Syntax Nslookup [<-SubCommand ...>] [{<ComputerToFind> | -<Server>}] Nslookup /exit Nslookup /finger [<UserName>] [{[>] <FileName>|[>>] <FileName>}] Nslookup /{help | ?} Nslookup /ls [<Option>] <DNSDomain> [{[>] <FileName>|[>>] <FileName>}] Nslookup /lserver <DNSDomain> Nslookup /root Nslookup /server <DNSDomain> Nslookup /set <KeyWord>[=<Value>] Nslookup /set all Nslookup /set class=<Class> Nslookup /set [no]d2 Nslookup /set [no]debug Nslookup /set [no]defname Nslookup /set domain=<DomainName> Nslookup /set [no]ignore Nslookup /set port=<Port> Nslookup /set querytype=<ResourceRecordType> Nslookup /set [no]recurse Nslookup /set retry=<Number> Nslookup /set root=<RootServer> Nslookup /set [no]search Nslookup /set srchlist=<DomainName>[/...] Nslookup /set timeout=<Number> Nslookup /set type=<ResourceRecordType> Nslookup /set [no]vc Nslookup /view <FileName> Parameters Parameter Description Nslookup -exit Exits nslookup. Nslookup -finger Connects with the finger server on the current computer. Nslookup -help Displays a short summary of nslookup subcommands. Nslookup -ls Lists...
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Citrix Cheat Sheet

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Terminal Server /Remote Desktop Client Shortcut Keys Key Combination Function Similar Local Keys CTRL+ALT+END Opens the Windows Security dialog box CTRL+ALT+DELETE CTRL+ALT+BREAK Toggles the Terminal Services client display from window to full screen NONE ALT+INSERT Cycles through running programs on the remote computer ALT+TAB ALT+HOME Displays the remote computer’s Start menu NONE ALT+DELETE Displays the remote window’s Control Menu ALT+SPACE BAR CTRL+ALT+NUMBERPAD MINUS Places an image of active window onto the TS clipboard ALT+PRINT SCREEN CTRL+ALT+NUMBERPAD PLUS Places an image of the entire Terminal Services client on the Terminal Services clipboard PRINT SCREEN Citrix ICA Client Shortcut Keys Key Combination Function Similar Local Keys SHIFT+F1 The Task List hotkey displays the local Windows Task List for Windows...
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Print Spooler Service Keeps Stopping, Crashing Automatically

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techsupportall.com (Solved) Print Spooler Service Keeps Stopping, Crashing Automatically Techexpert Print Spooler Keeps stopping Automatically  –  (Fixing Guide) In Windows XP, Windows Vista, Windows 7, Windows 8 Question When i try to print i got a error message “The print spooler service is not running” and then i am going to start it, print spooler service crashing windows 7 automatically, Doesn’t stay on,  on it started successfully and then again i gives a print command to printer it’s again shown me the same message, then i checked the “print spooler” service it is again stopped automatically. Solved Answer This post will guide you how to solve this problem “Print Spooler service keeps Stopping Automatically”, actually there are many reasons behind that, The main reason is the driver conflicting (Please update the printer drivers), however we explained everything in this post, please follow the following steps  to get rid of this problem “Print Spooler keeps...
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How do I close open files on my server?

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Various CCH ProSystem fx Tax applications lock files while they are in-use, such as a tax return file that is open in Tax Preparation.  To close files on the network, simply closing the return should release the lock.  The steps below explain how to close open files on your server. During this process, you can also see who has the files open. On a Microsoft Windows 2008 R2 server, follow these steps: On the server console, select Start > All Programs > Administrator Tools. Click Share and Storage Management. In the "Share and Storage Management" window, select Manage Open Files under the "Actions" column to open the "Manage Open Files" window. The "Accessed By" column shows who has files open.  Rebooting a workstation should close the files. If the files do not close or if the user cannot reboot, right-click the open files and select Close Selected.  Be careful when you...
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Cable Color Sequence

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Cable Color Sequence (Putting Ends on Cables) White-Orange; Orange; White-Green; Blue; White-Blue; Green; White-Brown; Brown Place end on cable with this color sequence. Crimp end on cable. Use SLT3 Tester to test the sequence, use 568 B port – place on both side; green lights go up and down (1,2,3,4) in sequence....
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About Subnetting

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  Welcome to the subnetting.net subnetting tutorial. This training session will teach you everything you need to know to pass any exam that requires TCP/IP knowledge. In addition, the methods you will learn here will allow you to not only solve subnetting questions, it will help you increase your speed and master TCP/IP concepts. For many entry-level to intermediate computer networking exams, the need to quickly solve subnet based questions is apparent. In addition, the mastery of these concepts will give you a major advantage when you sit for the exam. For example, I would estimate that the CCNA exam has around 40% subnetting questions. When you are done with this tutorial, these questions will be no harder than simple addition or subtraction. To put this is real life terms, the CCNA exam is 50 questions and most people get around 20 subnetting questions. When you learn to subnet, you should expect to ace these 20 questions. In...
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