Error establishing a database connection

Error reading from database

Once the instance is launched, it may take a few minutes before it is ready to connect. Check your instance to make sure it is running and has passed its status checks.

Check the network access control list (ACL) for the subnet.The network ACLs must allow incoming traffic from your local IP address through port 22 (for Linux instances) or port 3389 (for Windows instances). They must also allow outbound traffic routed to ephemeral ports (1024-65535).

… Expecting: ANY PRIVATE KEY, the file in which the private key is stored is incorrectly configured. If the private key file ends in .pem, it is possible that it is still incorrectly configured. One possible cause for an incorrectly configured private key file is a missing certificate.

If you connect to the instance via SSH and get any of the Host key not found in [directory], Permission denied (publickey), Authentication failed, permission denied, or Connection closed by [instance] port 22 errors, verify that you are connecting with the proper username for the AMI and that you have specified the proper private key file (.pem) for the instance.

No se pudo establecer conexión con la base de datos

Los problemas de conectividad en SQL Server tienen varias causas. Esta serie de artículos le ayuda a solucionar los problemas de conectividad más comunes de SQL Server y describe las herramientas y los métodos que puede utilizar para solucionarlos.

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Si varias instancias de SQL Server de su entorno se ven afectadas, o el problema es intermitente, suele indicar problemas de políticas de Windows o de red. Aunque esta serie de artículos proporciona orientación, es posible que no solucione eficazmente algunos escenarios específicos.

Antes de empezar a solucionar el problema, consulte Requisitos previos recomendados y lista de comprobación para solucionar problemas de conectividad para ver los registros que debe recopilar para ayudar a solucionar el problema. También hay una lista de acciones rápidas para evitar errores de conectividad comunes cuando se trabaja con SQL Server.

Unable to select the database

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Connection error

You can use the open source pgAdmin tool to connect to a database instance of RDS for PostgreSQL. You can download and use pgAdmin from without having a local instance of PostgreSQL on your client computer.

You can use a local instance of the psql command line utility to connect to a database instance of RDS for PostgreSQL. You will need PostgreSQL or the psql client installed on the client computer. To connect to the RDS for PostgreSQL DB Instance using psql, you must provide host information (DNS) and login credentials.

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The most common connection problem usually occurs with the access rules of the security group assigned to the DB Instance. If you used the default database security group when creating the database instance, most likely that group did not have the rules that allow you to access the instance.