Why does the local Bitrix not connect to the remote database?

Question

1C-Bitrix

Updated software (php and mysql) on the server. After that, the local copy (on OpenServer'e), which connected to the database on this server, stopped working. Issues

#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\lib\db\mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, object)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\lib\db\connection.php:330
#2: Bitrix\Main\DB\Connection->query(string)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\lib\config\option.php:226
#3: Bitrix\Main\Config\Option::load(string, NULL)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\lib\config\option.php:53
#4: Bitrix\Main\Config\Option::get(string, string, string)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\lib\httprequest.php:370
#5: Bitrix\Main\HttpRequest->prepareCookie(array)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\lib\httprequest.php:68
#6: Bitrix\Main\HttpRequest->__construct(object, array, array, array, array)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\lib\httpapplication.php:46
#7: Bitrix\Main\HttpApplication->initializeContext(array)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\lib\application.php:122
#8: Bitrix\Main\Application->initializeExtendedKernel(array)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\include.php:23
#9: require_once(string)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\include\prolog_before.php:14
#10: require_once(string)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\modules\main\include\prolog.php:10
#11: require_once(string)
  C:\OSPanel\domains\sitename.local\online\src\bitrix\header.php:1
#12: require(string)
  C:\OSPanel\domains\sitename.local\online\src\index.php:2

And without FatalError, etc. What could it be?

Answer 1

The question is closed. iptables was apparently overloaded and closed ports for external connections.