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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for June 26th, 2017

Recent bitsaver entries on Z80 assembly, CPM and concurrent Pascal

Posted by jpluimers on 2017/06/26


Posted in Assembly Language, CP/M, Development, History, Software Development, Z80 | Leave a Comment »

middelink/mikrotik-fwban: Use your Mikrotik firewall to do fail2ban like blocking of unwanted IPs. Written in Go

Posted by jpluimers on 2017/06/26

Interesting: middelink/mikrotik-fwban: Use your Mikrotik firewall to do fail2ban like blocking of unwanted IPs. Written in Go.

It might beat these (that just count SSH connections, not failed connection attempts):

Another alternative is to parse one of the logs:

Of course you should have this installed by default as part of your hardening process:


Posted in Development, Internet, MikroTik, Power User, RouterOS, routers, Scripting, Software Development | Leave a Comment »

[WARNING] Intel Skylake/Kaby Lake processors: broken hyper-threading

Posted by jpluimers on 2017/06/26

[WayBack[WARNING] Intel Skylake/Kaby Lake processors: broken hyper-threading via [WayBack] Affects all oses. Updated can be applied by updating your UEFI/BIOS microcode update for CPU. Make sure you apply those fixes. – nixCraft – Google+:

This warning advisory is relevant for users of systems with the Intel
processors code-named "Skylake" and "Kaby Lake".  These are: the 6th and
7th generation Intel Core processors (desktop, embedded, mobile and
HEDT), their related server processors (such as Xeon v5 and Xeon v6), as
well as select Intel Pentium processor models.

My own actions for now are below.

Find out which machines use CPUs on these lists:

Use these Linux commands to find out the model and hyperthreading support:

grep -E 'model|stepping' /proc/cpuinfo | sort -u
grep -qE '^flags.*[[:space:]]ht[[:space:]]' /proc/cpuinfo && \
echo "Hyper‐threading is supported"

Use this Windows command to find out the model:

wmic cpu get caption

Use this command on Mac OS X:

sysctl -n machdep.cpu.brand_string

If it’s on the list and supports hyperthreading, then disable hyperthreading.


Posted in Power User | Leave a Comment »

The Most Common VPN Error Codes Explained

Posted by jpluimers on 2017/06/26

Source: The Most Common VPN Error Codes Explained

  1. VPN Error 800 “Unable to establish connection”
  2. VPN Error 619 “A connection to the remote computer could not be established”
  3. VPN Error 51 “Unable to communicate with the VPN subsystem”
  4. VPN Error 412 “The remote peer is no longer responding”
  5. VPN Error 721 “The remote computer did not respond”
  6. VPN Error 720 “No PPP control protocols configured”
  7. VPN Error 691 “Access denied because username and/or password is invalid on the domain”
  8. VPN Errors 812, 732 and 734 “The connection was prevented because of a policy configured on your RAS/VPN server”
  9. VPN Error 806 “A connection between your computer and the VPN server has been established but the VPN connection cannot be completed.”


via: Could be useful. – Joe C. Hecht – Google+

Posted in Power User, Windows, Windows 10, Windows 7, Windows 8, Windows 8.1, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Vista, Windows XP | Leave a Comment »

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