postgres/roundcube issues since 2.1.1

Since installation of the Server App 2.1.1 update, roundcube is no longer accessible. I get the following when attempting to login:

DB Error in /Library/Server/Web/Data/Sites/Default/webmail/program/include/rcube_mdb2.php (107): _doConnect: [Error message: unable to establish a connection]

[Native message: ]

** pgsql(pgsql)://roundcube:xxx@localhost/roundcubemail

Warning: session_start(): Cannot send session cache limiter - headers already sent in /Library/Server/Web/Data/Sites/Default/webmail/program/include/rcmail.php on line 784

I've attempted to create a new postgres database for roundcube to use, but in the end, the result was the same. The installation tests return the following result:

Check DB config

DSN (write): NOT OK(MDB2 Error: connect failed)

Make sure that the configured database exists and that the user has write privileges
DSN: pgsql://roundcube:xxx@localhost/roundcubemail

Additionally, I cannot seem to access port 5432 via telnet on the local server. I started looking at making changes to tge postgres configuration files: postgresql.conf and pg_hba.conf in /library/server/postgres/data

Note: everything worked perfectly before 2.1.1

Any help would be appreciated. I'm four hours into this with no results...