Notes/Technology

Openfire with Smack disconnects with error : You acknowledged stanzas that we didn’t send

Posted on by Kj / 0 Comment

 

Problem: After connecting, openfire servers disconnects from Smack client giving an exception as below –

Connection XMPPTCPConnection[dhee@dheeyantra.com/bot] (0) closed w
ith error

org.jivesoftware.smack.XMPPException$StreamErrorException: undefined-condition You can read more about the meaning of this stream error at http://xmpp.org/rfcs/rfc6120
.html#streams-error-conditions
<stream:error><undefined-condition xmlns='urn:ietf:params:xml:ns:xmpp-streams'/><text>You acknowledged stanzas that we didn&apos;t send. Your Ack h: 11, our last stanz
a: 10</text></stream:error>
 at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPConnection.java:1057) [smack-tcp-4.3.0.jar:4.3.0]

 

Fix:

  1. In Openfire admin too, go to Server Manager => Server Properties
  2. Set stream.management.active = false

 

Notes/Technology

Get CQLSH working on Linux

Posted on by Kj / 0 Comment

 

Problem : CQLSH never works after a usual install.

Fix:

Install as below (on terminal)-

  1. Make sure to use pip, not pip3; python 2.7 not python 3.x.
  2. pip install cqlsh
  3. pip install cassandra-driver
  4. export CQLSH_NO_BUNDLED=true
  5. echo ‘export CQLSH_NO_BUNDLED=true’ >> ~/.bashrc
  6. cqlsh –cqlversion=3.4.4
Notes/Technology

Fix : /boot disk has no space ( on Ubuntu)

Posted on by Kj / 0 Comment

Problem : /boot disk has no space, thus blocking installation or removal of any package using apt-get

Fix :

In terminal –

cd /boot

ls

sudo rm -r abi-4.4.0-89-generic abi-4.4.0-92-generic config-4.4.0-89-generic config-4.4.0-92-generic initrd.img-4.4.0-89-generic initrd.img-4.4.0-92-generic System.map-4.4.0-89-generic System.map-4.4.0-92-generic vmlinuz-4.4.0-89-generic vmlinuz-4.4.0-92-generic

(From the listed files, remove least two versions of every file)

 

This command searches of kernel files not in use and removes them to make space.

 

Notes/Technology

“Sndfile not found” error while installing scikits audiolabs

Posted on by Kj / 0 Comment

Problem: The following error occurs when installing scikits audiolabs

SndfileInfo:
libraries sndfile not found in /usr/local/lib
libraries sndfile not found in /usr/lib
libraries sndfile not found in /usr/lib/x86_64-linux-gnu

Reason:

The sndfile dev libs are missing (apparently)

Fix

[bash]
sudo apt-get install libasound2-dev
sudo apt-get install python-dev python-numpy python-setuptools libsndfile-dev
sudo apt-get install libasound2-dev
[/bash]

Notes/Technology

Ubuntu: Load a disk on startup – the GUI way

Posted on by Kj / 0 Comment

 

  1. On terminal run
    • sudo gnome-disks
  2. In the dialog box that opens, choose the disk to mount from the left panel.
  3. In the right panel click on the gears icon
  4. In the pop up menu, choose Edit mount options
  5. Unset (put OFF) the Automatic Mount Options
  6. Make sure Mount at startup is checked.
  7. Give the folder name to load the disk to in the text box with label Mount Point
  8. Click OK.
  9. Restart the system.
Miscellaneous

Take care of this when you buy a new laptop bag..

Posted on by Kj / 0 Comment

Just thought of sharing this.

If you buy a new laptop bag, you have to be careful to remove the small sachets that contain small silica balls (or whatever they are. See photo).

I allowed them to remain in the bag (new one from American Tourister),  the sachets broke, and the released silica balls entered the USB, HDMI, LAN and audio slots of the laptop.

While I could get rid of them from other slots, a nasty particle is still stuck in the 3.5 mm audio slot. (Because I didn’t know of it and pushed in the audio jack, which took the darn ball further down the slot)

So yes, remember to to remove such sachets from your laptop bag before you use them.