Ετήσια αρχεία: 2020

Host or domain name not found. Name service error for name=smtp.gmail.com type=AAAA: Host not found, try again

 στο GNU/Linux  επισημασμένο με ετικέτα email / linux / postfix / server / ubuntu Από

Recently, a postfix mail server running on Ubuntu gave us the following error while trying to send an email to Bob: 

Jun 16 17:02:03 gateway postfix/smtp[23522]: ED3799A0D27: to=[email protected], relay=none, delay=0.02, delays=0.01/0.01/0/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=smtp.gmail.com type=AAAA: Host not found, try again)

After several attempts like changing the protocol (inet_protocols) to IPv4 (since AAAA is an IPv6 A-record) in /etc/postfix/main.cf and so on we could not get it running.. We restored the configuration file to its original and then we restarted the service:

sudo service postfix restart;

It worked!…. no idea why..

Lenovo Legion Y520 – Black Screen After RAM Upgrade to 32GB (2x16GB)

 στο Μη κατηγοριοποιημένο  επισημασμένο με ετικέτα Legion / Lenovo / Y520 Από

Recently, we updated the RAM modules of a Lenovo Legion Y520 from 16GB (2x8GB) to 32GB using two HyperX Impact DDR4 16GB, 2400MHz CL14 SODIMM modules.

Right after installing the new modules, after power on the laptop it would show a black screen, the fans would work at full speed but nothing else would happen. We tried placing the old RAM back inside but with no success, the same bad behavior would occur.

Since the battery of this laptop is bolted onto the chassis we thought that we might have to give it a “hard restart” or something to get it started.

Our solution

1) We powered off the laptop by long pressing the power button. 2) Then we released the button and long pressed it again until the laptop powered on and off again.
The next time we powered on the laptop it was working perfectly again!!

youtube-dl ERROR: unable to download video data: HTTP Error 403: Forbidden

 στο GNU/Linux  επισημασμένο με ετικέτα error / pip / youtube-dl Από

Recently, we were getting the following error in youtube-dl :

ERROR: unable to download video data: HTTP Error 403: Forbidden

We weren’t sure what that error meant (in the case of youtube-dl as the video is public) so we updated pip and youtube-dl to be sure that our problem was not that. The commands we used were the following:

python -m pip install --upgrade pip;
pip install --upgrade youtube-dl;

After the updates, we still got the same error… After some google-fu we read that it could be a caching issue! We cleared the cache as follows:

youtube-dl --rm-cache-dir;

Guess what? After that, the problem was resolved and we were able to reuse youtube-dl.

“Cookies & Consents Banner (Jetpack)” not available!

 στο WordPress  επισημασμένο με ετικέτα banner / consents / Cookies / jetpack / widget / wordpress Από

We got prompted by the Jetpack plugin to add their Cookies & Consents Banner (Jetpack) to our website to comply with the rules and regulations for privacy issues but when we visited the Widgets tab we could not find it there to add it.

It appears that the module for Extra Sidebar Widgets of Jetpack was disabled. To enable it, we visited this page https://bytefreaks.net/wp-admin/admin.php?page=jetpack_modules and activated it from the list.

After that, we refreshed the Widgets page and a list of new widgets, including the Cookies & Consents Banner (Jetpack).

When adding it, it created a new page with some basic information and got our plugin up and running!