DUAS: Communication issues between UVMS/UVC and Nodes through the network

Products

CA Automic Dollar Universe

Issue/Introduction

The Unijob or Dollar Universe nodes are not accessible from the Univiewer console.
It is for example impossible to display the Node settings, perform a Node Synchronization, display the Objects or the Job Runs on all the impacted nodes.
The registration process may also fail.

Examples of error Messages :

From UVC log file: 
    Agent IO Connection problem - ServerException - connect: error creating socket to node_name/port_number

From unijob universe.log file: 
    u_connect | u_gethostbyname_mf(uvms_node_name) returns error: Unknown host (gethostbyname(uvms_node_name) returns null pointer)

From UVMS uvserver.log file:
    ERROR| consolidation-1-worker-xxx| com.orsyp.monitoring.consolidation.stdimpl.owls.OwlsConsolidationStdImpl | ConnectionException: 
    com.orsyp.std.IoConnectionException: Connection Authenticate problem com.orsyp.UniverseException: ServerException - connect: error creating socket to 
    distant.hostname.domain/port_number

    UniverseException: The server is unreachable. Reason: NIO CDJ Connection problem - ServerException - connect: error creating socket 
    [company_name/node_name/X]

Cause

Network traffic not opened between the different components on their associated ports.
To make a connection between the different nodes, we use the TCP IP protocol, so basically, a set of ports and IP addresses must be opened on each Node / UVMS and other components.

Resolution

We recommend to check the network configuration using the ping and telnet commands:

Check the ping result between the UVC host and the host where duas is installed
Check the ping result between the UVMS host and the host where duas is installed
Check the ping result distant_hostname

If the ping results are not ok, please check the network configuration for each impacted hosts
=> The address IP resolution, DNS or host file, must work correctly.

Check the telnet result between the UVMS host and the DUAS host: telnet duas_hostname 10600 (default IO port change if another port is used)
Check the telnet result between the UVC host and the DUAS host: telnet duas_hostname 10600 (default IO port change if another port is used)
Check the telnet result between the Tomcat hosting UVWC and the duas/unijob host: telnet duas_hostname 10600 (default IO port change if another port is used)

Check the telnet result between the DUAS host and the UVMS host: telnet uvms_hostname 4184 (default port change if another port is used)

If the telnet is not ok the firewall rules must be checked and modified in order to open the concerned ports on the impacted hosts.

To have a normal network connectivity, the ping and telnet commands must give positive results for the concerned hostname(and/or IP address) and the concerned port number.

Additional Information

If the hostname resolution does not work, for a Dollar Universe node you can register the node using the IP address instead of the hostname.

Workaround (Not recommended)

Add an entry in the local hosts file, the hostnames should be declared and resolved by your DNS server.