Can't connect Confluence to postgres database

[Deleted user]

I'm not trying to do anything custom or unusual, just a simple install on a fresh Ubuntu 14 server.  I can't find any useful help online, Atlassian just says create a user and a database. I did that. Does not work.

I was able to create a user and a database for Jira, and Jira is happy. I created a new user and a new database the same way, on the same server, for confluence and it will not connect. I get:

SQLState - 08P01
org.postgresql.util.PSQLException: Protocol error. Session setup failed

The database and Jira and confluence are on the same server. Using the wizard:

Database type: PostgreSQL (9.5)

Simple

Hostname: localhost (tried 127.0.0.1)

Port: 8090 (the TCP HTTP port)

username is the same as the database name and I am sure the password is correct.

Test Connection gives the above error. I have found no solution after hours of searching online.

[Deleted user · Accepted solution]

Changed port number, then it worked.

[Jakob Reichelt]

I had the same issue, it worked by using port 5432.