Upgrading PHP from 5.3.3 to 5.3.28 Error

[nooblarama]

Hello,
Not quite sure where to start with this one.
I have a hosting account that allows me to have multiple PHP versions and I can switch between them for the domain when required... which it will be soon.
I ran a test on a dummy website
Joomla 3.2.3
PHP 5.3.3
MySQL 5.1.73
Global config settings
DB MySQL
Host localhost:3306
When I go to the Hosting Settings for the test website I can switch the PHP version to 5.3.28 and the website gives me this error on a white screen for front and back ends.
"Error displaying the error page: Application Instantiation Error: Could not connect to MySQL."
Any clues?
Thanks community

[sovainfo]

You might want to use the Forum Post Assistent as mentioned above to find out whether the correct MySQL driver is loaded. It is either MySQL or MySQLi depending on which one you used.

[nooblarama]

Will give it a try

[nooblarama]

Joomla! Instance :: Joomla! 3.2.3-Stable (Ember) 6-March-2014
Joomla! Platform :: Joomla Platform 13.1.0-Stable (Curiosity) 24-Apr-2013
Joomla! Configured :: Yes | Read-Only (444) | Owner: 10014 (uid: /gid: ) | Group: 506 (gid: ) | Valid For: 1.5
Configuration Options :: Offline: 0 | SEF: 1 | SEF Suffix: 0 | SEF ReWrite: 1 | .htaccess/web.config: Yes | GZip: 0 | Cache: 0 | FTP Layer: 0 | SSL: 0 | Error Reporting: default | Site Debug: 0 | Language Debug: 0 | Default Access: N/A | Unicode Slugs: N/A | Database Credentials Present: Yes

Host Configuration :: OS: Linux | OS Version: 2.6.18-028stab098.1 | Technology: x86_64 | Web Server: Apache | Encoding: gzip, deflate | Doc Root: /var/www/vhosts/***********| System TMP Writable: Yes

PHP Configuration :: Version: 5.3.3 | PHP API: cgi-fcgi | Session Path Writable: No | Display Errors: | Error Reporting: 22527 | Log Errors To: | Last Known Error: | Register Globals: | Magic Quotes: | Safe Mode: | Open Base: /var/www/vhosts/*********** | Uploads: 1 | Max. Upload Size: 128M | Max. POST Size: 100M | Max. Input Time: 60 | Max. Execution Time: 60 | Memory Limit: 128M

MySQL Configuration :: Connection Error: 2005:Unknown MySQL server host 'localhost:3306' (1) ( may not be an error, check with host for remote access requirements. ) : Database Credentials Present? in Configuration...

PHP Extensions :: Core (5.3.3) | date (5.3.3) | ereg () | libxml () | openssl () | pcre () | zlib (1.1) | bz2 () | calendar () | ctype () | hash (1.0) | filter (0.11.0) | ftp () | gettext () | gmp () | session () | iconv () | pcntl () | readline () | Reflection ($Revision: 300393 $) | standard (5.3.3) | shmop () | SPL (0.2) | SimpleXML (0.1) | sockets () | exif (1.4 $Id: exif.c 293036 2010-01-03 09:23:27Z sebastian $) | tokenizer (0.1) | xml () | cgi-fcgi () | curl () | dom (20031129) | fileinfo (1.0.5-dev) | gd () | imap () | json (1.2.1) | mbstring () | mysql (1.0) | mysqli (0.1) | PDO (1.0.4dev) | pdo_mysql (1.0.2) | pdo_sqlite (1.0.1) | Phar (2.0.1) | soap () | sqlite3 (0.7-dev) | wddx () | xmlreader (0.1) | xmlwriter (0.1) | xsl (0.1) | zip (1.9.1) | ionCube Loader () | Zend Engine (2.3.0) |
Potential Missing Extensions :: mcrypt | suhosin |

Switch User Environment (Experimental) :: PHP CGI: Yes | Server SU: No | PHP SU: Yes | Custom SU (LiteSpeed/Cloud/Grid): No
Potential Ownership Issues: Maybe

Core Folders :: images/ (755) | components/ (755) | modules/ (755) | plugins/ (755) | language/ (755) | templates/ (755) | cache/ (755) | logs/ (755) | tmp/ (755) | administrator/components/ (755) | administrator/modules/ (755) | administrator/language/ (755) | administrator/templates/ (755) |

Templates :: SITE :: protostar (1.0) | beez3 (3.1.0) |
Templates :: ADMIN :: hathor (3.0.0) | isis (1.0) |

[nooblarama]

Hmmm not sure what to do next. Tried it with mysql and msqli set did the switchto the later php and same error.

[nooblarama]

Just wanted to follow up on this. My host hadn't installed some missing extensions for the new PHP version and it was unable to see MySQL. The new version was deinstalled on the server, extensions installed and then the new PHP reinstalled and it all works fine.