Error connecting to the Server in postgreSQL - postgresql

I am trying to add a connection to the server in postgreSQL. But when I fill all the details I get this error
Error connecting to the server: FATAL: role "abc" does not exist.
"abc" is the username I want to create.
I am using Tomcat server eclipse for this.
Please help me find a solution to this problem.
Thanks in advance!

If the user does not yet exist, you will have to login as the admin and create it before you can login as that user.

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Heroku postgres connection failed because of password auth

I want to connect to the heroku postgres database I have set up using spring boot java. But before that I wanted to try and connect using pgAdmin 4. When I tried this I got an error saying the authentication for the 'username' had failed.
Then I started adding the database to my application.proporties file in spring boot to test it there. I got the samen error message.
This is the error message I got in spring boot: org.postgresql.util.PSQLException: FATAL: password authentication failed for user "username".
I then even tried it in DBeaver. But still the same error.
heroku postgres credentials
application.properties in spring boot java
I checked multiple times if the password and username are the same. I really don't know what to do now, because I can't find any documantation on the heroku website
I'm NO EXPERT but I did have the same problem. I think I fixed it on the page with fields for Host, Port, Maintenance database, Username, Password, ... and then by toggling "save password."

Not able to connect pgAdmin4 with elephantsql

I want to use elephantsql with pgadmin but not able to connect.
Below is the my issue:-"
FATAL: no pg_hba.conf entry for host "169.149.233.33", user "tfndkxmm", database "aaehpcif", SSL on
FATAL: no pg_hba.conf entry for host "169.149.233.33", user "tfndkxmm", database "aaehpcif", SSL off
i am following this instruction : https://www.elephantsql.com/docs/pgadmin.html but keep getting this error.
I had seen similar question on Stackoverflow.But it doesn't solve my problem.
I am also attaching my connection Screenshot here.
Please someone help me to resolve this issue.
Thanks

mongo dump and restore (when restoring in different os)

I am working on a project, there I need to dump a database from windows and need to restore it on a centos server.
Whenever I do that, there is some error.
Like - error reading database: (Unauthorized) not authorized on mydatabase to execute command
or
error connecting to host: could not connect to server: connection() : auth error: sasl conversation error: unable to authenticate using mechanism "SCRAM-SHA-1": (AuthenticationFailed) Authentication failed.
Both os have the same mongo version that is 4.2
How can I correct it?
The error not authorized on mydatabase to execute command indicates that either you have not authenticated, or the authenticated user has not been granted the appropriate permissions to execute that command.
Authentication failed means just that. The server side log may have more detail, like the user and database names used in the auth attempt.
To fix these, make sure:
you are providing authentication credentials
the user account you are using has already been created in the server
the user account has been granted permission for that command on the correct database/collection
The Security page in the docs might be a good place to start.

SQL shell (psql) permission denied

Before i ask you a question please understand if my question is not well asked. This is my first time using psql. Well, i tried to start the server with shell and there isn't any other databases as you see and they are all default. However it doesn't ask me for password and it occured an error as you see in the code. what do i have to do to fix this issue?
Server [localhost]:
Database [postgres]:
Port [5432]:
Username [postgres]:
find: /c/pagefile.sys: Permission denied
Just open sqlshell in administrator. My problem solved by this.

Cannot connect to https://api.elephantsql.com from pg admin

has anyone success to create connection to elephantsql.org using pgadmin?
i want to try to store my database on a server and im trying to use elephantsqlcom
i want to connect to it using pg admin to make maintenance easier. i have followed this instruction : https://www.elephantsql.com/docs/pgadmin.html but keep getting this error
what should i do? thanks all
change database name from postgres to xwpgagbb similar to:
see user AND DEFAULT DATABASE are the same?..