TCP Provider: Error code 0x2746 / No Connectivity via PHP and Apache2 - php

Question

I've installed the ODBC Drivers for Microsoft SQL Server on Debian 11 and configured everything appropriately. When I call the PHP script via
php /var/www/html/sqlsrv.php
everything is working as excepted. When calling the PHP via browser I am constantly getting the following error
SQL Error: Error information: SQLSTATE: 08001 Code: 10054 Message:
[Microsoft][ODBC Driver 18 for SQL Server]TCP Provider: Error code
0x2746 SQLSTATE: 08001 Code: 10054 Message: [Microsoft][ODBC Driver 18
for SQL Server]Client unable to establish connection
Here is my PHP so far:
<?php
$serverName = "xxx\SESQL";
$connectionOptions = array(
"database" => "SEMESS",
"uid" => "xxx",
"pwd" => "xxx",
"TrustServerCertificate" => "yes"
);
// Establishes the connection
$conn = sqlsrv_connect($serverName, $connectionOptions);
if ($conn === false) {
die(formatErrors(sqlsrv_errors()));
}
// Select Query
$tsql = "SELECT ##Version AS SQL_VERSION";
$tsql2 = "SELECT * FROM BENUTZER";
// Executes the query
$stmt = sqlsrv_query($conn, $tsql);
$stmt2 = sqlsrv_query($conn, $tsql2);
// Error handling
if ($stmt === false) {
die(formatErrors(sqlsrv_errors()));
}
?>
<h1> Success Results : </h1>
<?php
while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
echo $row['SQL_VERSION'] . PHP_EOL;
}
while( $row = sqlsrv_fetch_array( $stmt2, SQLSRV_FETCH_ASSOC) ) {
var_dump($row);
}
sqlsrv_free_stmt($stmt);
sqlsrv_close($conn);
function formatErrors($errors)
{
// Display errors
echo "<h1>SQL Error:</h1>";
echo "Error information: <br/>";
foreach ($errors as $error) {
echo "SQLSTATE: ". $error['SQLSTATE'] . "<br/>";
echo "Code: ". $error['code'] . "<br/>";
echo "Message: ". $error['message'] . "<br/>";
}
}
?>
I've added
"TrustServerCertificate" => "yes"
as without it a connection was not possible.
Also, I've updated to OpenSSL 1.1.1 - do I need to update Apache as
well? If, how?
Why is it working with PHP CLI but not with PHP Apache?