Linux: mount.cifs failed with host is down


due to some security issues (Wannacry) Windows administrators are going to disable the unsecure smb1 protocol.

mount.cifs is using smb1 by default. So when you tried to connect to a Windows machine where smb1 is disabled you get an error: mount error(112): Host is down.
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Debian: git error gnutls_handshake() failed: Public key signature verification has failed.


I’m on debian testing and cloning from a git repository fails with error: “gnutls_handshake() failed: Public key signature verification has failed” occured.
git is linked against the libcurl3-gnutls library. Newer versions have a bug when using git over a https proxy.
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Windows: Cumulative Update cannot be installed on Windows 10


let us assume you have installed Windows 10 1607 and you want to install the cumulative Update KB3189866 and the update fails:

c:\Temp > wusa %TEMP%\AMD64-all-windows10.0-kb3189866-x64.msu /quiet /norestart

Eventlog: EventID 3,
Windows update could not be installed because of error 2149842967 (Command line: “C:\Windows\system32\wusa.exe” “C:\Temp\AMD64-all-windows10.0-kb3189866-x64.msu”)
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Windows: Windows did not start. Howto write a new MBR and recover Windows OS Bootsector


if you migrate a Windows Installation to another Computer or virtual environment such as VMWare ESXi or VMWare Workstation it could happen that the system won’t start.

A typical error when the master boot record or the boot sector of the boot partition needs to be updated or must be rewritten is when

  • After Postscreen of the BIOS the console shows “Operating system not found” this means there is no boot code in MBR
  • or it shows only a blinking cursor in the upper left edge. 2 possible reasons are thinkable
  1. MBR boot code is loaded but could not load the operation system => The boot sector of the Windows Boot partition needs to be updated
  2. The boot(active) flag of Windows boot partition  is missing

For all cases you can use the command line program “testdisk” which is part of the most linux live CDs/DVDs to correct this.
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