![]() ": Io exception: Invalid number format for port number Io exception: Invalid number format for port number".The error also occurs when trying to connect to a database with the wrong driver. ![]() ![]() The most common reason for this error is that the database URL contains a syntax error preventing the driver from accepting it. "The selected Driver cannot handle the specified Database URL.JDBC syntax errors typically result in one of two error messages: If this test fails, please ask your system or database administrator for help. You can use the Ping Server button to make sure that the a TCP/IP network connection can be established to the specified server and port. The first three problems usually results in a somewhat cryptic message about I/O errors or a time-out. Native libraries for a JDBC driver are not found.The user account is not authorized to connect from the client where you run DbVisualizer,.A syntax error in a manually entered JDBC URL,.A firewall between the client and the database server blocks connections to the database port,.TCP/IP access is not enabled in the database server,.Incorrect values for the Database Server or Database Port fields in the Object View tab for the connection,.There may be many reasons for why you cannot connect to a database, but some of the most common are:
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