Huawei Smartwatch Experiment

I think I am a little bit late, but I finally took the plunge and am now the (hopefully) proud owner of a smartwatch. Not sure how smart this little gizmo is, but at least it looks neat.

But first to the decision itself. It is not, that I don’t have a watch. Actually, I have two: a Seiko and a Bulova. Both nice watches and the Seiko is with me for quite a while. And they are perfect instruments to read, well.. time. What more can a smartwatch offer? Not much it seems. But I am somewhat of a geek, so I have to try it. As a result I started reading reviews and a lot of posts about smartwatches. I am not a big Apple fan (except for their designs) and it seemed, that the Apple Watch has its problems with the haptic and the general usability. In fact it seems to be so bad, that people are getting rid of their watches. Not that the Android world is so much better, but there is more diversity. And it seemed to me, that the Huawei Smartwatch was kinda okay. So I ordered one on ye good olde Amazon. And of course USPS messed up and delivered it to the wrong building, which meant, that I had to chase the package down. But finally I could hold it in my hands.


The watch is in a very stylish and high quality looking black cube with gold lettering.


With shaking hands I took the top part of and opened the lid…


This is a nice looking watch. Like the packaging the watch looks very high quality and has a very nice soft leather wrist band. Yes, I chose the leather version.



The setup was very easy and straight forward after I installed the Android Wear app on my Nexus 6P (also Huawei… what a coincidence). Bluetooth pairing and WiFi set up was all more or less automatically. And after an OS upgrade the watch is up and running. I could even test some of the notification settings. This was easier, than I thought it would be. I still have to explore some of the Android Wear apps, but for now I am good.

I think the biggest problem so far was choosing a clock face. For the moment I am using “Moon Phase”, but that might change. Here is the standard and the standby clock face.



So this is the very first impression of my new little gizmo. Let’s see how this watch works in real life conditions. Is it really a smart watch or is it just an overhyped toy? What apps make sense to use and which don’t? And the battery life is of course a concern. After charging it, the battery drained quickly to about 75%, but that was also after a couple of system updates and other play things. Also, I currently have the display always on, hence the standby clock face.

To be continued…

Check SSL Connection Foo

It was that time of the year, when I had to renew some SSL certificates. Renewing and updating them in the server is a nice and easy process. But checking, whether the server is delivering the correct certificate and, that I updated and popluated the intermediate certificates correctly, is a different story.

For websites it is quite easy. Every browser is pretty verbose about the certificate of an https connection. But mail clients are not so talkative. Luckily openssl can help here.

To get the certificate in PEM form to compare you can simply call this command. Of course you have to replace and with the correct values, like for IMAPS on

openssl s_client -showcerts -connect :

If you want it a little bit more verbose, then you can pipe it again through openssl to get a more human readable version:

openssl s_client -showcerts -connect : | openssl x509 -text

Sometimes the connection itself is not supporting SSL or TLS directly, so you have to give it a hint. For instance for SMTP connection with STARTTLS you can use:

openssl s_client -showcerts -connect :25 -starttls smtp | openssl x509 -text

In my version of s_client only smtp, pop3, imap and ftp were supported protocols. If you are looking for more information about this you will find it in the man pages of openssl and s_client.

Nagios Enabling External Command on Debian based Distributions

While debugging my check disk problem after the 15.10 upgrade, I saw that I forgot to enable external commands. That is handy, when you want to re-schedule a check to see, if your changes took effect. Again, something that is easily activated. So if you see something like this, then you might want to make some changes:

Error: Could not stat() command file ‘/var/lib/nagios3/rw/nagios.cmd’!

The external command file may be missing, Nagios may not be running, and/or Nagios may not be checking external commands. An error occurred while attempting to commit your command for processing.

First stop the Nagios service with systemctl, service or with the init script. Whatever your distribution prefers. Then edit as root the configuration file /etc/nagios3/nagios.cfg and check if the variable check_external_commands is set to 1:


Afterwards update the rights to the external command with the following:

dpkg-statoverride --update --add nagios www-data 2710 /var/lib/nagios3/rw
dpkg-statoverride --update --add nagios nagios 751 /var/lib/nagios3

And then start Nagios again. Et voila, you can call external commands.

Nagios check_disk Foo on Ubuntu 15.10

Another day another foo, this time done to the check_disk plugin for Nagios on Ubuntu. After updating to 15.10 my disk space check all of a sudden failed with this one here:

DISK CRITICAL - /sys/kernel/debug/tracing is not accessible: Permission denied

It seemed a little odd, especially when I could access that file normally before. So something has changed and the workaround is actually fairly easy. As root edit the file /etc/nagios-plugins/config/disk.cfg and change the command for check_all_disks. You need to add -A -i ‘/sys’ to the command line. So your command for check_all_disks will look like this:

# 'check_all_disks' command definition
define command{
command_name check_all_disks
command_line /usr/lib/nagios/plugins/check_disk -w '$ARG1$' -c '$ARG2$' -e -A -i '/sys'

Restart Nagios and all is good. After I fixed it this way I found, that it is actually filed as a bug 1516451 in Ubuntu’s Launchpad here

Happy monitoring.

OpenVPN Windows Service Foo (Updated)

As a longtime OpenVPN user on Linux I thought it would be an easy task to set up OpenVPN as a service on Windows. Well, I was right… and couldn’t be wronger. Setting up the service is part of the installation notes for OpenVPN. Just search for “Running OpenVPN as a Windows Service” in the notes and you will find a pretty good description that should get you up and running in no time.

But the devil is of course in the detail. This kind of setup works perfect for servers, or in general for machines with good internet connectivity that never go into standby or hibernation. Once you use a laptop, which you usually put into standby on a regular basis, or you simply have a sluggish WiFi connection, then you have a problem. And the problem is, that OpenVPN is unable to re-establish the tunnels and, at least in my case, causes quite some CPU load on the machine. The problem is actually well known to the OpenVPN team (see here and here).

So what are your options to fix it. In OpenVPN’s people suggest to use either OpenVPN Service for Windows or NSSM. I tried my best with the OpenVPN Service for Windows, but I couldn’t get it to work. So sorry guys, I can’t recommend that one. Then I tried NSSM and hit similar hurdles but the documentation was better and I could get it actually to work.

So without further ado, I present to you the setup of OpenVPN as a service in Windows using NSSM.

For starters you have to download and install the latest version of OpenVPN (Download) and NSSM (Download). NSSM does not come with an installer. That means, you have to create a folder for instance in your “Program Files” directory (or whatever directory name %PROGRAMFILES% represents). And then, depending on your operating system, you copy the win32 or win64 version of nssm.exe into that directory. Now open a console with adminstrator rights and navigate to the newly created folder and you can try to execute NSSM to get the command line parameters:

C:\Program Files\NSSM>nssm.exe
NSSM: The non-sucking service manager
Version 2.24 64-bit, 2014-08-31
Usage: nssm

To show service installation GUI:

nssm install [<servicename>]

To install a service without confirmation:

nssm install <servicename> <app> [<args> ...]

To show service editing GUI:

nssm edit <servicename>

To retrieve or edit service parameters directly:

nssm get <servicename> <parameter> [<subparameter>]

nssm set <servicename> <parameter> [<subparameter>]

nssm reset <servicename> <parameter> [<subparameter>]

To show service removal GUI:

nssm remove [<servicename>]

To remove a service without confirmation:

nssm remove <servicename> confirm

To manage a service:

nssm start <servicename>

nssm stop <servicename>

nssm restart <servicename>

nssm status <servicename>

nssm rotate <servicename>

C:\Program Files\NSSM>

You can control NSSM completely from the command line, but it also has an actually usable GUI. You can start the installation process by doing the following

nssm install

or if you want to give already a service name (can’t be changed with NSSM once it is installed!). Note that if you have multiple tunnels, then you have to setup multiple services. So give it a meaningful name.

nssm install "My OpenVPN Service"

The second command should give you the following window:
NSSM Installer

The next step is filling in all the information necessary for NSSM to set up OpenVPN as a service.


Path: This is the path to the OpenVPN binary and should usually be C:\Program Files\OpenVPN\bin\openvpn.exe.
Startup directory: This is the path to the directory where you store your OpenVPN configuration files. Usually that is C:\Program Files\OpenVPN\config. But if you want to run the OpenVPN UI with manual started tunnels in parallel, then you should create a separate folder, e.g. C:\Program Files\OpenVPN\config-nssm. Otherwise it is easy to confuse manual tunnels with service tunnels. In my sample I won’t use manual tunnels, so I go with the default.
Arguments: This is the configuration file for the tunnel, that should reside in the above defined startup directory.
NSSM Application Tab


Display name: This is the name that is basically visible everywhere. Most of the time this is the same as the service name, but this is up to you.
Description: As the name says, this is a description, that can be viewed later on in the services area.
Startup type: This is the standard service startup type setting for a windows. Most likely you want to choose Automatic here. But you have the choice between Automatic, Automatic (Delayed Start), Manual and Disabled here.
NSSM Details

Log on

Here you can define as who this service needs to run, but unless you are doing something very special here you can leave it to the default setting (Local System Account).


Running Windows 10, this tab can be more important. Using the system account you will be able to install the service, but when starting the service, you might see an error. In the event log it will show up with the following message:

Program C:\Program Files\OpenVPN\bin\openvpn.exe for service OpenVPN siteopsvpn (NSSM) exited with return code 3221225794.

This basically means, that you use an account that has no rights to execute OpenVPN. I solved it, by running the service as a user, that has administrative rights on that machine. You can even create a special user to do that.


The dependencies tab is important, because here we have to add the services that OpenVPN is depending on (Dhcp and tap0901).
NSSM Dependencies


In this tab you can control how the service is handled by the processor. For instance if it should only run on a specific processor or a higher priority. For the normal use case this can be left alone.
NSSM Process


Unless you run into strange problems you can leave this one alone.
NSSM Shutdown

Exit actions

This is again a tab that you don’t have to touch under normal circumstances.
NSSM Exit Actions


Now we have to do something again. With the OpenVPN UI you have the ability to take a look at log files. Well, with services you don’t, unless you define them here. You can use the same for all redirections, but I prefer to have a separate log for stdin, stdout and stderr. Log files are usually located in C:\Program Files\OpenVPN\log.

File rotation

This tab is an extension of the I/O tab, as it configures the log rotation. I set it to rotate and left the rest alone. But you can decide on different rotation strategies, so that the files don’t get too big, too old, or whatever the problem might be.
NSSM File Rotation


This last tab can be ignored for the usual use case. But you might have a special case where you have to add or even replace the environment, then this tab is your friend.
NSSM Environment

Now a last chance to think about the service name… You are good? Okay, then click “Install Service” and NSSM will install OpenVPN as a service that can survive standby and sluggish network connections. You have to start the newly create service with either the net command, the nssm command or via the services in the control panel.

If you have to change anything you can do that by calling NSSM with the edit parameter.

nssm edit "My OpenVPN Service"

And, as mention before, you can do all this on the command line. Here is the sequence.

nssm install "My OpenVPN Service" C:\Program Files\OpenVPN\bin\openvpn.exe
nssm set "My OpenVPN Service" AppDirectory "C:\Program Files\OpenVPN\config"
nssm set "My OpenVPN Service" AppParameters myvpnconfig.ovpn
nssm set "My OpenVPN Service" AppStdin "C:\Program Files\OpenVPN\log\myservice-stdin.log"
nssm set "My OpenVPN Service" AppStdout "C:\Program Files\OpenVPN\log\myservice-stdout.log"
nssm set "My OpenVPN Service" AppStderr "C:\Program Files\OpenVPN\log\myservice-sterr.log"
nssm set "My OpenVPN Service" AppRotateFiles 1
nssm set "My OpenVPN Service" DependOnService Dhcp tap0901

Happy tunneling.

Lync CTRL-Enter Foo (Update)

It seems that Microsoft’s products creating more and more foos. This time it is Lync, also known as Skype for Business.

It is okay, that Lync uses the Enter key to send a message or the CTRL-Enter combination start a call. But it is not okay that there is no way to change these key combinations. Especially when all other instant messengers that I use, default to CTRL-Enter to send a message.

So now I have to use Lync at work, which starts a call when I want to send a message and no direct way of changing it. The only thing that is possible, is removing the CTRL-Enter key combination so that I don’t accidentally start a call.

A solution is described in a TechNet blog post. So here is what worked for me in Lync 2013 (a.k.a. Office 15.0).

First open the registry editor (regedit.exe) and navigate to the following key. If you have a different Lync/Office version you might just change the version number. Create the missing pieces of the key, if necessary. In my case I only found the Microsoft part and had to create everything else.


Create a new string value inside that key:

Value Name: CtrlEnter
Value Data: 13,8

Restart Lync and the CTRL-Enter foo should be gone.

Update: Fixed the registry key (Lync, not Office). Thank you Karel, for pointing that out to me.

Windows 8.1 Store App Can’t Open Foo

Windows continues to kick my behind. Out of the blue the Windows 8.1 installation on my workstation didn’t want to open the store app. Not that I really need or want it. But the same happened for the settings app, which was a little bit of a problem.

I should have taken a screenshot but the error message was something along the lines of “This app can’t open” and “Refreshing your PC might help fix it”.

It seems that I was not the only one with that problem there is even a Microsoft blog post about it. The reason seems to be that the affected apps are not registered anymore with Windows.

So here is how it can be fixed. In a command prompt that runs as administrator I ran the following commands. When you look at the blog post it seems that you don’t need administrative rights but you never know. Now enter the following commands to re-register the system apps:

Store app:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\WinStore\AppxManifest.XML

Camera app:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\camera\AppxManifest.xml

File Manager (One Drive) app:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\FileManager\AppxManifest.xml

Settings app:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\ImmersiveControlPanel\AppxManifest.xml

These execution of these commands, especially for the store app, might take a while.

This would have been easy, but of course a Microsoft products never make things easy on me. So I hit the problem that the a registry key doesn’t have the right owner and I got the error 0x8007064A.

So you have to open the registry editor (Windows + R and then regedit) and navigate to the registry key:

HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages

And then change the ownership of this key to SYSTEM:

  1. On the Edit menu, click Permissions.
  2. Click Advanced, and then click the Owner tab.
  3. Under Change owner to, click the new owner, and then click OK.

avelsieve Updates…

I was using SquirrelMail and the Sieve plugin avelsieve for quite a while. And I once made the commitment on the mailing list to do some further development on avelsieve to make it work with newer PHP versions and fix other problems. The result was my own little update and some not yet released stuff that I only used myself.

But things changed and I moved on to Roundcube. And more importantly the spare time that I could spend on this project got less and less. I am really sorry, but I won’t be doing any further development on avelsieve. For anybody who wants to use my patched version, it is still and will be up there for download.