covid 19 – Travelling to Dubai from Berlin with a connection in Amsterdam – do I need a PCR test?

I read the emirates travel guide and it says that passengers arriving from Germany do not need to take the PCR before travel.

I am travelling from Germany but I have connection in Amsterdam with a 1 hour 15 minute layover.

Does this mean I have to take the test?

I could save 60 Euros if I don’t have to.

mysql – Unable to create a new connection using Navicat in Ubuntu

I have installed XAMPP on my ubuntu. Everything are installed in /opt/lampp directory.

When I run localhost/phpmyadmin, it is working fine and I can create database as well.

But when I try to setup using Navicat, it is returning me

2002 - Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2 "No such file or directory")

My server is also running sudo /opt/lampp/lampp start

I have used following configuration:

Host: localhost
Port: 3306
User Name: root
Password: my_password

Can anybody please help me here.

Thank You.

sharepoint online – Power Apps without internet connection

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Do connection and message coexist in CSP / Pi calculus?

Berkely Socket API has two different kinds of network sockets:

  • byte stream sockets: connection-oriented and message-less
  • datagram sockts: connection-less and message-oriented.

In Pi Calculus (and CSP), there is both channel and message.

  • Is it correct that a channel is a connection? Or what is the difference between them?
  • How do connection and message coexist and work together?


centos – Error establishing a database connection on a fresh WordPress installation

I’ve installed a fresh copy of WordPress on CentOS 7/Apache but am getting the dreaded “Error establishing a database connection” error message when navigating to the site to complete the setup. I’ve created a new database for WordPress to use, along with a user which has all privileges on it.

My MySQL (MariaDB) installation is on a separate host, however I can connect to it fine with the command line client:

mysqlshow -u <wordpress_db_user> -p -h <host ip>

shows information_schema and <wordpress_db_name> in the list of Databases, and

mysql -u <wordpress_db_user> -p -h <host_ip> <wordpress_db_name>

opens a session as expected – however there’s nothing to query as WP has not set up its tables yet. I’ve even tried

sudo -H -u apache bash -c 'mysql -u <wordpress_db_user> -p -h <host_ip> <wordpress_db_name>'

to make sure that SELinux isn’t blocking apache from connecting.

Is there anything else I can check to get this working? Most of the guides out there stop at “Have you got the right credentials” and “Have you tried repairing the database”…

esxi no http connection inside vm

hi, I got a dedicated server at hetzner and I setup 10 VMs with windows 10 and everything is fine except that for some reason I can’t access… | Read the rest of

php – Repeated DB connection at max user connections

I am trying to create class with connect to mysql database. And if there is max number of connections I want to wait and try it again. I figured out, how it can works, but I am not sure, if its the right way of doing it. So, my code looks like this:


class DbConnect {

  private $attemps = 1;
  private $errorCode;
  private $maxAttemps = 10;
  private $pdo;
  private $dsn = "mysql:host=localhost;dbname=...;charset=utf8";
  private $options = (
    PDO::ATTR_EMULATE_PREPARES   => false, // turn off emulation mode for "real" prepared statements
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION, //turn on errors in the form of exceptions
    /*PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,*/ //make the default fetch be an associative array

  public function __construct(){
    while ($this->errorCode == 1040 && $this->attemps <= $this->maxAttemps) {
      usleep(pow(2, $this->attemps)*10000);


  protected function tryConnect(){
    try {
      $this->pdo = new PDO($this->dsn, "root", "", $this->options);
    } catch (Exception $e) {
      $this->errorCode = $e->getCode();



Is there anything i should change? Thank you very much.

connection issues – Windows sees the old content of a particular Android folder

I have a problematic folder in my Android tablet (Android 7.1.1) which didn’t refresh in Windows 7 after connecting the tablet with PC by USB cable (NOT as a Mass Storage Device) and trying to refresh it in Windows Explorer (F5).

I use this folder for saving Python files from PyDroid application and want to back up its content to my Windows PC. In Windows, I don’t see new files, and modified old files I see with their unmodified sizes / dates.

Other folders work OK, so I use them as a workaround — I first copy all files from that problematic folder to another one (in Android tablet) and then copy these copies to my PC.

What is the reason and how to fix it?

linux – understand ss -to4 output for a jdbc connection

My application connects to a database over JDBC, and performs a lot of sequential inserts. There is only 1 JDBC connection opened by the application. As the performance is not as expected, I started to check the socket status using ss -to4 and filtering for my database IP.

What I notice is, every few seconds, I see some data in the ss output

ESTAB  0   <some non zero value>  <source ip>:<port> <db ip>:<db port> timer:(on,192ms,0)

The timer starts with initial value of 204ms and reduces down to 0. And there are no retransmissions (retrans is 0 max). When I do a packet capture and check on Wireshark, there are no TCP retransmissions or fast retransmissions.

If the connection is stable, and if there are no retransmissions, why does the timer start?

centos8 – Centos 8 VPS Use openvpn client without Lost SSH connection?

I want use openvpn connection(client) Centos 8 VPS server.

But when I connect direct “redirect-gateway” I lost SSH connection.

When I try –pull-filter ignore redirect-gateway, I connection But cannot access internet with Tun driver

How can I fix this problem?