Resume and bio of the author Couple of articles related to my hobby - robotics
My impressions about immigration to Australia. In Russian only. Recipes for everyday problems solving
Linux-related posts Windows-related posts
Software-related posts A lot of info about hardware
Different tools you might find useful Posts about various web technologies
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Andrey Mikhalchuk’s Blog

Technoblog about life

Jun 20, 2010 Fixing Wireshark’s “TCP checksum offload” error in linux

On some linux machines when you run wireshark you may notice that a lot of packets are marked as invalid (highlighted as black). The contents looks perfectly correct, but for some reason checksum is brkoen and wireshark suggestes that the reason for such unpleasant event is “TCP checksum offload”. Let’s fix it …

Jun 19, 2010 Fix: Error: register r24, r26, r28 or r30 required

I was recently compiling some Arduino code with NewSoftSerial and got hit by infamous “Error: register r24, r26, r28 or r30 required” error. NewSoftSerial is a great library and those using older avr-gcc compiler enjoy it alot. Problem is the newer gcc doesn’t like one nasty error in the code and here is how to fix it …

Feb 7, 2008 How to disable automount in linux (Re-reading the partition table failed with error 16)

Imagine you’re repartitioning a disk and when you quit fdisk writing the new partition table automount tries to mount new partitions. So instead of refreshed disk ready for newfs you get this warning:

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next boot.

So you can forget about newfs for awhile. What do you do? Just reboot? What if you need to repartition more then one disk? Here is the solution …

Feb 6, 2008 Solving “The server you are connected to is using a security certificate that could not be verified.” problem

Uff that was tough one … If you decided to make your mail communications more secure you probably switched on SSL option in your mail client for POP3/IMAP/SMTP servers. There is a good chance you will get one of those errors that sound like

The server you are connected to is using a security certificare that could not be verified.
A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.
Do you want to continue using this server?

I spent way too much time solving the problem because what was just annoying message in Outlook appeared to be serious problem in MacMail. It was not capable of working correctly with that problem. In addition to that I tried to solve the problem using Plesk 8.2 that was a mistake. It appeared that whatever you do with certificates in Plesk that doesn’t affect the mail. So here is the solution for the problem:

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