One more 'Unable to Connect to DB error'

[Optimaximal]

sysPass Version
3.1

Describe the bug
I cannot get past the MySQL stage on initial install

To Reproduce
Steps to reproduce the behavior:

1. Set up according to https://syspass-doc.readthedocs.io/en/3.1/installing/debian9.html#installation - syspass cloned from git repo.
2. Navigated to index.php and complete first time install
3. Enter root or syspass detail (manually created user - hosted mode ticked) and click Install
4. MySQL Error.

Screenshots

Event log
[2020-07-09 23:36:15] syspass.EXCEPTION: logger {"message":"Unable to connect to DB
#0 /var/www/syspass/lib/SP/Services/Install/MySQL.php(94): SP\Storage\Database\MySQLHandler->getConnectionSimple()
#1 /var/www/syspass/lib/SP/Services/Install/MySQL.php(72): SP\Services\Install\MySQL->connectDatabase()
#2 /var/www/syspass/lib/SP/Services/Install/Installer.php(266): SP\Services\Install\MySQL->__construct(Object(SP\Services\Install\InstallData),Object(SP\Config\ConfigData))
#3 /var/www/syspass/lib/SP/Services/Install/Installer.php(187): SP\Services\Install\Installer->setupDb()
#4 /var/www/syspass/lib/SP/Services/Install/Installer.php(99): SP\Services\Install\Installer->install()
#5 /var/www/syspass/app/modules/web/Controllers/InstallController.php(88): SP\Services\Install\Installer->run(Object(SP\Services\Install\InstallData))
#6 [internal function]: SP\Modules\Web\Controllers\InstallController->installAction()
#7 /var/www/syspass/lib/SP/Bootstrap.php(240): call_user_func_array(Array,Array)
#8 [internal function]: SP\Bootstrap->SP{closure}(Object(Klein\Request),Object(Klein\Response),Object(Klein\ServiceProvider),Object(Klein\App),Object(Klein\Klein),Object(Klein\DataCollection\RouteCollection),Array)
#9 /var/www/syspass/vendor/klein/klein/src/Klein/Klein.php(886): call_user_func(Object(Closure),Object(Klein\Request),Object(Klein\Response),Object(Klein\ServiceProvider),Object(Klein\App),Object(Klein\Klein),Object(Klein\DataCollection$
#10 /var/www/syspass/vendor/klein/klein/src/Klein/Klein.php(588): Klein\Klein->handleRouteCallback(Object(Klein\Route),Object(Klein\DataCollection\RouteCollection),Array)
#11 /var/www/syspass/lib/SP/Bootstrap.php(464): Klein\Klein->dispatch(Object(Klein\Request))
#12 /var/www/syspass/lib/Base.php(75): SP\Bootstrap->run(Object(DI\Container))
#13 /var/www/syspass/index.php(28): require(String)","caller":"N/A"}
[2020-07-09 23:36:15] syspass.EXCEPTION: logger {"message":"(P) SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES)
#0 /var/www/syspass/lib/SP/Storage/Database/MySQLHandler.php(174): PDO->__construct('mysql:charset=u...', 'root', 'paw9fMBVsgAcDnt...', Array)
#1 /var/www/syspass/lib/SP/Services/Install/MySQL.php(94): SP\Storage\Database\MySQLHandler->getConnectionSimple()
#2 /var/www/syspass/lib/SP/Services/Install/MySQL.php(72): SP\Services\Install\MySQL->connectDatabase()
#3 /var/www/syspass/lib/SP/Services/Install/Installer.php(266): SP\Services\Install\MySQL->__construct(Object(SP\Services\Install\InstallData), Object(SP\Config\ConfigData))
#4 /var/www/syspass/lib/SP/Services/Install/Installer.php(187): SP\Services\Install\Installer->setupDb()
#5 /var/www/syspass/lib/SP/Services/Install/Installer.php(99): SP\Services\Install\Installer->install()
#6 /var/www/syspass/app/modules/web/Controllers/InstallController.php(88): SP\Services\Install\Installer->run(Object(SP\Services\Install\InstallData))
#7 [internal function]: SP\Modules\Web\Controllers\InstallController->installAction()
#8 /var/www/syspass/lib/SP/Bootstrap.php(240): call_user_func_array(Array, Array)
#9 [internal function]: SP\Bootstrap->SP{closure}(Object(Klein\Request), Object(Klein\Response), Object(Klein\ServiceProvider), Object(Klein\App), Object(Klein\Klein), Object(Klein\DataCollection\RouteCollection), Array)
#10 /var/www/syspass/vendor/klein/klein/src/Klein/Klein.php(886): call_user_func(Object(Closure), Object(Klein\Request), Object(Klein\Response), Object(Klein\ServiceProvider), Object(Klein\App), Object(Klein\Klein), Object(Klein\DataCol$
#11 /var/www/syspass/vendor/klein/klein/src/Klein/Klein.php(588): Klein\Klein->handleRouteCallback(Object(Klein\Route), Object(Klein\DataCollection\RouteCollection), Array)
#12 /var/www/syspass/lib/SP/Bootstrap.php(464): Klein\Klein->dispatch(Object(Klein\Request))
#13 /var/www/syspass/lib/Base.php(75): SP\Bootstrap::run(Object(DI\Container))
#14 /var/www/syspass/index.php(28): require('/var/www/syspas...')
#15 {main}","caller":"N/A"}

Platform (please complete the following information):

• OS: Ubuntu 18.04
• Browser: Chrome

Additional context

• I have successfully logged into mysql using both root and 'syspass' user via SSH and phpmyadmin. The username and password are not the issue
• I have tried setting the user host detail to localhost & % - same issue.
• I have tried suffixing the db server value with the port (3306)
• Other services on the same server, including WordPress, can connect fine using the standard port
• SELinux is not installed
• I have edited mysqld.cnf and removed the enforced binding to localhost.
• the error is turning up in var/log/mysql/error.log, but with no real explanation why.

[Optimaximal]

Ok, in a fit of strangeness, now I am in the office this is all working. Could be a result of my working from home over the VPN. Very strange...

[l33one]

Change the "syspass database server" field from localhost to syspass-db