TIA 19 - OPC UA Client - Connection problems

Hi,

I have setup- OPC UA client connection towards a OPC Server by using OPC_UA_RedList_C and OPC_UA_WriteList_C, both PLC and OPC Server is in the same IP subnet.

I have trippel checked everyting, but I cannot get the connection up, recive error state 

3870_0600 (The session could not be set up. The instruction waits 30 seconds before trying to set up the session again)

When I use client software UA Expert I can connect without any problem.

We are using "No security" and no username or password.

How can I troubleshoot these further ?

When I open up Read and Write list the Node ID is a DNS name http://xx.xxx.xx.xx.x.x=Open.Speed

When I compare other projects I have then the Node ID is urn:xxx.xxx.xxx.x.x:Name-OPCUA;S=Open.Speed

Can it be that I connect wrong based on the OPC server is based on DNS/hostname and not IP or something.... ?

The opc.tcp://xxx.xxx.xxx.x:xxxxx is correct when I take proper properties and => Connection configuration and check it for both blocks (read and write).

Note:
I have been told that somebody else had similar problem connecting to the same OPC UA Server, they solve it by using Session.UseDnsNameAndPortFromDiscoveryUrl = true;

Is it possible todo something similar in the PLC, but these was in a windows OPC client I think...

Your help for further troubleshooting is highly appreciated !

I solve the issue by reading these: Error connecting to Beckhoff OPC UA Server using S7-1517 OPC UA Client - 298532 - Industry Support Siemens 

I added the URI string on the client said and than it started working...
No changes on the server side.