Question

I use H2 Database as DBMS from a remote computer,so I enabled remote access from a browser as follows:

webAllowOthers=true

but when i try to connect to the server from my java application i get this error from H2:

remote connections to this server are not allowed

screenshot:

And also already looking into the code Analyzer with (Error Code: 90117):

REMOTE_CONNECTION_NOT_ALLOWED = 90117

The error with code 90117 is thrown when trying to connect to a TCP server from another machine, if remote connections are not allowed. To allow remote connections, start the TCP server using the option -tcpAllowOthers as in:

java org.h2.tools.Server -tcp -tcpAllowOthers

Or, when starting the server from an application, use:
Server server = Server.createTcpServer(“-tcpAllowOthers”);
server.start();

I do not understand how to activate the tcpAllowOthers, it does not exist in .h2.server.properties ?

Answer 1

There are two different server:

• the Web Console server that is used to run the H2 Console tool (the GUI tool). It can be accessed by a browser only.
• the TCP server that allows to connect an application that uses JDBC, when using the client/server mode (jdbc:h2:tcp://localhost/~/test)

The file .h2.server.properties is only used for the Web Console server. It only supports webAllowOthers=true. This file is not used by the TCP server.

To enable remote access to the TCP server, you need to start the TCP server using the option -tcpAllowOthers. To start both the Web Console server (the H2 Console tool) and the TCP server with remote connections enabled, you would need to use:

java -jar h2*.jar -web -webAllowOthers -tcp -tcpAllowOthers -browser

(this also starts a browser)