Ondrej Žilinec – IT Blog

I didn’t know that it’s possible in Windows TCP/IP stack make port forwarding. I knew it’s possible in Linux using iptables. In windows we have powerful tool called netsh.

Let’s have a example. Some service is listening on port TCP/10000. If I want to make this service listen on other port than TCP/10000 and there is no configuration to change I will use netsh to make it happen. Let’s look at listening ports on TCP/10000 and TCP/20000:

We can see there is no port listening on TCP/20000. Let’s make a magic and run command:

netsh interface portproxy add v4tov4 listenport=20000 listenaddress=0.0.0.0 connectport=10000 connectaddress=192.168.100.118

You cannot use loopback or 0.0.0.0 in connectaddress parameter. You can even use remote server IP address in connectaddress parameter.

Let’s look at netstat commands:

If your command doesn’t work, please, check if service called IP Helper is Running.

To see all configuration of portproxy settings just run following command:

netsh interface portproxy dump

To delete rule just run following command:

netsh interface portproxy delete v4tov4 listenport=20000 listenaddress=0.0.0.0

And that’s all folks,

Once upon the time I had problem with Windows Update. All updates got downloaded and installed. When user click on button Restart Windows got error 0x80070005.

After couple minutes of debugging with Process Monitor I found out that process called explorer.exe had problem with accessing directory C:\Windows\System32\Tasks. That means that if you click on button Restart in Windows Update, Windows doesn’t just restart system. It creates Scheduled Task to reboot. Weird, but it does it this way.

So I have created GPO with security settings for directory C:\Windows\System32\Tasks and allow BUILTIN\Users have Modify rights to this directory.

And that’s the way we make it 🙂

Hello folks

Today I found one really nice utility at Windows Server 2008 R2 and up. It’s called Storage Explorer. It’s MMC snap-in which enables you to see what your fiber optic cards (HBAs) on fiber optic fabrics.

You can see information about your HBAs:

This utility somehow connected into fibre optic switch and listed its ports and WWNs connected to it:

And also found some information about optical switch (for example management IP address):

I know this tool is not as powerfull as Brocade SANHealth, but it’s bettern than nothing 🙂

That’s all folks for today,

In my class today we needed to do right-click in Windows using keyboard. I just found out that Shift + F10 simulates right-click 🙂

That’s all for today,

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Ak by ste mali nejaké otázky, sem s nimi.

 

You can configure expiration period for Certification Template. By default there are default maximum validation periods set to:

• One year for Stand-alone Certification Authority
• Two years for Enterprise Certification Authority

This means you have Certification Template set its validity for example for 10 years, but you can enroll certificates with validity 1 or 2 years (Stand-alone / Enterprise Certification Authority).

This can be changed via registry keys described in KB254632.

Thank you for my colleague Róbert Švec.

Today is a day when Windows Server 2012 was released and it’s available for download. First new feature I wanted to test is Data Deduplication.

Theory

Data Deduplication in Windows Server 2012 is performed as background job, which runs by default every hour. This process runs when server is idle and it doesn’t eat all server’s free resources. One job can run per one volume. It can deduplicate/check 100GB/hour. It does deduplication of variable-sized chunks (32-128KB) of files. Nice picture is on the bottom of this page. By default it deduplicates files which were not accessed for more than 5 days. It doesn’t deduplicate following file types: aac, aif, aiff, asf, asx, au, avi, flac, jpeg, m3u, mid, midi, mov, mp1, mp2, mp3, mp4, mpa, mpe, mpeg, mpeg2, mpeg3, mpg, ogg, qt, qtw, ram, rm, rmi, rmvb, snd, swf, vob, wav, wax, wma, wmv, wvx, accdb, accde, accdr, accdt, docm, docx, dotm, dotx, pptm, potm, potx, ppam, ppsx, pptx, sldx, sldm, thmx, xlsx, xlsm, xltx, xltm, xlsb, xlam, xll, ace, arc, arj, bhx, b2, cab, gz, gzip, hpk, hqx, jar, lha, lzh, lzx, pak, pit, rar, sea, sit, sqz, tgz, uu, uue, z, zip, zoo.

Let’s play

This feature is not enabled by default. You need to enable it by wizard Add Roles and Features:

When this is done you can use all Data Deduplication Powershell Cmdlets. To use these cmdlets you need to run Powershell as Administrator :-).

Microsoft engineers gave us one tool DDPEVAL.exe which can do little check data on our drives and tell us expected deduplication savings. You can copy utility DDPEVAL.exe to other system and run it to check deduplication expected ratio before even trying deduplication.

Read more…

Today I installed final version of Windows Server 2012 and I noticed new copy window which looks very nice:

 

 

I hope Metro look have more than that 🙂

 

Once upon the time I was at one campus and I wanted to do presentation. When I they gave me IP address of projector I wanted to use, I started to wonder how to connect to it 🙂 Now I know, Windows 7 has utility to do so. It’s called netproj.exe. You run it, enter IP/host name, password and you are connected. Really nice to know 🙂

Sometimes you need to find out if your windows is activated and quickes way to do so is to run command:

slmgr /dli

This command can also do

• /ipk <Product Key> – Install product key (replaces existing one)
• /ato [Activation ID] – Activate Windows
• /dli – Display license information
• /dlv – Display detailed license information
• /xpr – Expiration date for current license state
• …AND MANY MORE

For full help use slmgr /?.