[horde] SQL Authentication error

[meberhardt at unl.edu.ar]

Hi all,

I'm trying to configure Horde with "SQL Authentication with  
custom-made queries".

I followed this old how-to: https://wiki.horde.org/sqlauthhowto

I've changed "hordeauth" to "full" in IMP backends and the suggested  
configuration in horde/conf.php.

Horde thows the next error:

Uncaught exception 'Horde_Db_Exception' with message 'Could not  
instantiate PDO. PDOException: SQLSTATE[08006] [7] invalid connection  
option «app»
Stack trace:
#0 /usr/share/php/Horde/Db/Adapter/Pdo/Pgsql.php(88):  
Horde_Db_Adapter_Pdo_Base->connect()
#1 /usr/share/php/Horde/Db/Adapter/Base.php(157):  
Horde_Db_Adapter_Pdo_Pgsql->connect()
#2 /usr/share/php/Horde/Core/Factory/Db.php(189):  
Horde_Db_Adapter_Base->__construct(Array)
#3 /usr/share/php/Horde/Core/Factory/Db.php(106):  
Horde_Core_Factory_Db->_createDb(Array, 'c9a1e33da7b4785...')
#4 /usr/share/php/Horde/Core/Factory/Auth.php(171):  
Horde_Core_Factory_Db->create('horde', 'auth')
#5 /usr/share/php/Horde/Core/Factory/Auth.php(52):  
Horde_Core_Factory_Auth->_create('sql')
#6 /usr/share/php/Horde/Registry.php(2247): Horde_Core_Factory_Auth->create()
#7 /usr/share/php/Horde/ErrorHandler.php(59):  
Horde_Registry->getLogoutUrl(Array)
#8 /usr/share/horde/imp/lib/Application.php(620):  
Horde_ErrorHandler::f [pid 27653 on line 48 of  
"/usr/share/php/Horde/Db/Adapter/Pdo/Base.php"]

What am I doing wrong?

Software versions:
SO: Debian 9
Horde 5.2.17
Postgres client & server 9.6
PHP 7.0.27

Thanks in advance.

Matías


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