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Unable to establish connection: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

I am trying to do the tutorial for starters. I work with the denodo free trail on aws and using the design studio https://community.denodo.com/tutorials/browse/basics/2fs5jdbc I installed all what i need to. the sql server is running and java, python client etc. is installed I can see and i have in the sql server access to the acme_crm tables In the external libary i uploaded the JBDC jar. file what i downloaded. The ports and logins are like written in the Tutorial. and i used them. But when i am testing the connection i got the message: **Unable to establish connection: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.** And i dont know why. Do i have to install some more ? or where is the mistake? Have anyone a idea what i did wrong or what i can do ? Thanks for helping
JDBC
user
15-06-2022 10:29:11 -0400
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1 Answer

Hello, If I have this problem, I would check that the port for my underlying data source can be reachable. I could use telnet to confirm it. I could issue below command in the Command Prompt. `telnet <hostname of data source><port>` I could check by providing the host name of the data source and corresponding port number like 3306 which is a port number of MySQL database. If I want to have information about the error, I could check in the vdp.log file in <DENODO_HOME>/logs/vdp. Hope this helps!
Denodo Team
15-06-2022 19:01:55 -0400
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