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notes/technology

Getting 401 unauthorized on Asterisk Login in spite of correct creds in PJSIP.Conf

Posted on August 17, 2025 by Sreekumar Kj / 0 Comment

Rest all being good, the issue was the credentials from chan_sip module (sip.conf) were being picked up. Do these: Sreekumar KjSreekumar (KJ) has been a hobby p...

notes/technology

Activate back lighting of LIVE TECH gaming keyboard on Ubuntu

Posted on February 8, 2025 by Sreekumar Kj

To enable the back light LEDs of the Live Tech keyboard in Ubuntu follow these steps sudo apt install brightnessctl sudo brightnessctl -ls #note the scrolllock ...

notes

RabbitMQ installation fails in in the last leg of setting up in ubuntu 20.04

Posted on June 2, 2021 by Sreekumar Kj / 0 Comment

Error: Setting up rabbitmq-server (3.8.16-1) … Job for rabbitmq-server.service failed because the control process exited with error code. See "systemctl status ...

notes/technology

Enable dark mode for Chrome on desktop

Posted on May 3, 2021 by Sreekumar Kj / 0 Comment

Here is how you can apply dark more on chrome on your desktop – That’s it. Now you can have easy on eyes theme on Chrome, just like your IDE ! Sreekumar KjSreek...

notes/technology

NPM install gives error : Cannot find module ‘semver’

Posted on March 20, 2021 by Sreekumar Kj / 0 Comment

Problem:We get this error when we do npm install – Error: Cannot find module ‘semver’Require stack: Reason:Version issues Fix:Run these commands sudo rm -rf /us...

notes/technology

Fix : Docker node down after restart

Posted on November 5, 2020 by Sreekumar Kj

Problem: One of the docker nodes does not start up after restart. Error in the log is msg="error removing task " error="incompatible value" Reason: Docker swarm...

notes/technology

IP Telephony – bit rates of audio formats, and other notes

Posted on October 29, 2020 by Sreekumar Kj

The bit rates for the most common audio formats – ALAW 8 BITS ULAW 8 BITS PCM 16 BITS SIGNED/UNSIGNED ADPCM 8 BITS The endian-ness for more than one byte system...

notes/technology

Fix : Docker node down after restartIP Telephony – bit rates of audio formats, and other notes

Posted on October 29, 2020 by Sreekumar Kj / 0 Comment

The bit rates for the most common audio formats – ALAW 8 BITS ULAW 8 BITS PCM 16 BITS SIGNED/UNSIGNED ADPCM 8 BITS The endian-ness for more than one byte system...

notes/technology

Fix: Cannot start container Subnet sandbox join failed error from docker

Posted on October 27, 2020 by Sreekumar Kj

Error : Few docker containers don’t start up. In the /var/log/syslog they give the error “Cannot start container Subnet sandbox join failed…” Fix: Restart the m...

notes/technology

React Ajax call on load gives : “Error: Should not already be working.”

Posted on September 2, 2020 by Sreekumar Kj

Problem : On page refreshes, the ajax calls in the componentDidMount functions throws the error : “Error: Should not already be working.” Reason : Probably the ...

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