Month: January 2017

Belkin KVM: Falied to validate certificate

After one of JVM updates, my Belkin KVM (Remote IP Manager) has started refusing to start with “Falied to validate certificate” error followed by “PKIX path validation failed”:

I’ve found following exceptions in Java console: PKIX path validation failed: Algorithm constraints check failed on disabled signature algorithm: MD5withRSA

and User has denied the privileges to the code
 at sun.plugin2.applet.Plugin2ClassLoader.getPermissions(Unknown Source)
 at sun.plugin2.applet.Applet2ClassLoader.getPermissions(Unknown Source)

Google says that this is pretty common problem and returned plenty of receipts how to fix it.

Scanning the system for potential locations of the file, there are four candidates. However, there is a catch: we should fix Java not in the system-wide location but the Java plugin for the web browser you’re using (Safari on MacOS in my case).

Jareks-MacBook-Pro:~ jhartman$ locate
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/security/

So we can skip the last three locations and just focus on the 1st one. Change the lines as described

Jareks-MacBook-Pro:~ jhartman$ edit "/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/security/"

jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 256, \
 DSA keySize < 1024, EC keySize < 224
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768, \
 EC keySize < 224

Save and restart the browser (Safari). This time the KVM applet can start (after plenty of security warnings though).


The application has to be also white-listed, otherwise it will generate error as below:

Open System Preferences, Java settings and add IP address of your KVM to the list:

Add following:

Again: save and restart your browser.

Update 2

Another security exception is required (after one of Java 8 updates):

MBP:~ jhartman$ edit "/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/security/java.policy"

Add this line within the grant { }; section:

// KVM
permission "", "connect, accept"; 

How to check if all Calibre books are already in the Amazon cloud?


My primary software for managing Kindle books is Calibre. I’m using Amazon cloud for books synchronisation and sometimes I’d like to ensure that all my books stored in Calibre have been already sent to the cloud. Mainly, to avoid re-sending books and avoid duplicates.

Getting a list of Amazon books

Refer to Kindle Library List article.

After executing this step you should have one or more text listing your books:

Jareks-MacBook-Pro:Downloads jhartman$ java -jar KindleLibrary.jar 1.htm
Amazon book list extractor
Elements found:400
Saving 1.html
Saving 1.txt
Saving 1.xml
Jareks-MacBook-Pro:Downloads jhartman$ java -jar KindleLibrary.jar 2.htm
Amazon book list extractor
Elements found:400
Saving 2.html
Saving 2.txt
Saving 2.xml
Jareks-MacBook-Pro:Downloads jhartman$ java -jar KindleLibrary.jar 3.htm
Amazon book list extractor
Elements found:373
Saving 3.html
Saving 3.txt
Saving 3.xml

Getting a list of Calibre books

Now open your Calibre, press a small triangle icon next to the Convert Books icon. Follow the instructions below:

After pressing OK you should get your Calibre books:

Jareks-MacBook-Pro:Downloads jhartman$ head CalibreBooks.csv
"Świat pani Malinowskiej ; Trzecia płeć","Tadeusz Dołęga-Mostowicz"
"Drugie życie doktora Murka","Tadeusz Dołęga-Mostowicz"
"Świat pani Malinowskiej","Tadeusz Dołęga-Mostowicz"
"Wysokie Progi","Tadeusz Dołęga-Mostowicz"
"Złota maska","Tadeusz Dołęga-Mostowicz"
"Morderstwo pod cenzura","Marcin Wroński"
"Wąż Marlo t1","Marcin Wroński"

Compare the lists

In the very last step, use tide up the output files.

#!/usr/bin/env bash

awk -F $'\t' '{print $1,$2}' 1.txt > Amazon.tmp
awk -F $'\t' '{print $1,$2}' 2.txt >> Amazon.tmp
awk -F $'\t' '{print $1,$2}' 3.txt >> Amazon.tmp
sort Amazon.tmp > Amazon.txt

awk -F ',' '{print $1,$2}' CalibreBooks.csv | sed 's/"//g' | sort | grep -v "title authors" > Calibre.txt

And finally – use a side-to-side text compare tool (JEdit, WinMerge, any other) and view the differences between Amazon.txt and Calibre.txt:

Review the differences and take proper actions:

  • Send the file to the cloud
  • Remove duplicates in the cloud (yes, this will be also visible in the output)

I hope it will help.