When I Double Click on a Probe I get unable to Reach Controller, Node:/Domain/Hub/Robot/Probe Error Message: Communication Error

Document ID : KB000004108
Last Modified Date : 01/02/2019
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Issue:

Communication Error

Resolution:

Check the following:


Using telnet utility on the host where IM is running, test connectivity to controller port on robot.  For example:

telnet 192.168.2.4 48000


If the telnet succeeds:


Check the Messages section in IM for a timeout related to getting the probe configuration.  If there is a timeout message, increase  the Probe Request-> Timeout Value in IM Tools from the Options menu.  Set the value to a slightly higher value, and retest the failing operation.  Repeat if necessary.


If the telnet fails:

Check to see if there is a firewall between the robot and the machine where IM is running and/or a firewall on the robot host.

If there is any NAT'ing involved, meaning the registered robot IP is not reachable directly but only through a NAT'ed interface, add the following parameters to your robot.cfg file for the robot where you are unable to reach the probes.

robotip_alias = <NAT'ed IP through which Robot can be reached>
robotip = <Robot's Local IP address>


For example:

robotip = 192.168.2.4 <= Local IP of the robot host
robotip_alias = 172.16.1.4 <= NAT'ed IP of robot host