Tried the following
sysctl net.core.somaxconn
net.core.somaxconn = 4096
sudo sysctl -w net.core.somaxconn=8192
but without a success.
(more…)Category Archives: Ubuntu
An error occurred when accepting connection in the local socket. Code: 24
Configuring a TCP proxy with Nginx on Ubuntu 24.04
Install Nginx with stream module:
sudo apt install nginx-full
The output of the command
nginx -V
should contain with-stream=dynamic.
And add the following to /etc/nginx/nginx.conf:
stream {
server {
listen 12345; # The port that Nginx listens to
proxy_pass 192.168.0.121:389; # Where to forward connections
}
}
Exporting and importing WSL distributions
Exporting
In PowerShell:
wsl --export Ubuntu Ubuntu-01.tar
where Ubuntu is the distro name.
Importing
wsl --import UbuntuA C:\Users\dmitriano\wsl\UbuntuA Ubuntu-24.01.tar
probably the folder C:\Users\dmitriano\wsl\UbuntuA should exist.
Using lb to measure LDAP performance
Download and install latest Go:
wget https://go.dev/dl/go1.25.1.linux-amd64.tar.gz
tar xf ../distrib/go1.25.1.linux-amd64.tar.gz
realpath go
export GOROOT=/home/dmitriano/dev/tools/go
export GOPATH=$HOME/go
export PATH=$GOPATH/bin:$GOROOT/bin:$PATH
Install the package:
go install github.com/hamano/lb@latest
Using Apache JMeter to measure LDAP performance
Extract the archive:
tar xf /mnt/c/Users/dmitriano/Downloads/apache-jmeter-5.6.3.tgz
Install Java runtime:
sudo apt install default-jre
java --version
openjdk 21.0.8 2025-07-15
OpenJDK Runtime Environment (build 21.0.8+9-Ubuntu-0ubuntu124.04.1)
OpenJDK 64-Bit Server VM (build 21.0.8+9-Ubuntu-0ubuntu124.04.1, mixed mode, sharing)
Running v2rayN client on WSL
unzip /mnt/c/Users/dmitr/Downloads/v2rayN-linux-64.zip
sudo apt install libice6 libsm6
./v2rayN &
curl -s https://api.ipify.org
Investigating Kerboros with kinit and Wireshark
On the domain controller:
nslookup -q=SRV _kerberos._tcp.other.local
Server: localhost
Address: 127.0.0.1
_kerberos._tcp.other.local SRV service location:
priority = 0
weight = 100
port = 88
svr hostname = 7-dev-de-dc16.other.local
7-dev-de-dc16.other.local internet address = 10.15.7.16
Squid unexpectedly stopped working
Squid unexpectedly stopped working with my home internet connection. I created a temporary user:
cd /etc/squid/
sudo htpasswd -B squid-password temp
sudo service squid reload
tried the following command
curl -v -x https://developernote.com:3129 --proxy-user temp:<password> -I https://api.ipify.org/
with another internet provider and it succeeded.
(more…)Reducing image size with command line
With the command below
mogrify -path . -strip -quality 50% *.jpg
I reduces the size of the following images
-rwxrwxrwx 1 def def 4.0M Apr 9 16:48 20250409_164822.jpg*
-rwxrwxrwx 1 def def 3.6M Apr 9 16:48 20250409_164831.jpg*
-rwxrwxrwx 1 def def 4.2M Apr 9 16:49 20250409_164902.jpg*
-rwxrwxrwx 1 def def 4.1M Apr 9 16:49 20250409_164910.jpg*
-rwxrwxrwx 1 def def 3.7M Apr 9 16:49 20250409_164917.jpg*
-rwxrwxrwx 1 def def 3.8M Apr 9 16:49 20250409_164924.jpg*
My first attempt to make a video call with PJSIP
Added video codecs to pjsip.conf:
allow=h263p
allow=h263
allow=h264
allow=vp8
see full PJSIP configuration on GitHub.
core show channeltypes
Type Description Devicestate Presencestate Indications Transfer
------------- ------------- ------------- ------------- ------------- -------------
Recorder Bridge Media Recording Channel Driver no no yes no
Announcer Bridge Media Announcing Channel Driver no no yes no
USTM UNISTIM Channel Driver no no yes no
CBAnn Conference Bridge Announcing Channel no no yes no
CBRec Conference Bridge Recording Channel no no no no
PJSIP PJSIP Channel Driver yes no yes yes
AudioSocket AudioSocket Channel Driver no no no no
UnicastRTP Unicast RTP Media Channel Driver no no no no
MulticastRTP Multicast RTP Paging Channel Driver no no no no
IAX2 Inter Asterisk eXchange Driver (Ver 2) yes no yes yes
Local Local Proxy Channel Driver yes no yes no
Surrogate Surrogate channel used to pull channel f no no no no
----------
12 channel drivers registered.
