What does the message "Relay URL: Socket was closed by peer" mean?

FAQ #101676

This error message can have two reasons; one caused by a TCP connection which has been closed by the server, of if the S-Bus connection is not working correctly.


The PPOs in an S-Web Editor project are not displayed on a VGA MB Panel (PCD7.D4xxV), but instead the message "Relay URL: Socket was closed by peer" is displayed in the message window.
This message can also be displayed if an S-Bus communication is configured (between a serial port of a PCD containing a Webserver and a VGA MB Panel on port 0 or 1).

Possible reason
This message means the communication isn't working due to the fact that

  • If a http connection is used:
    The server has closed the connection for some reason.
  • If a Serial-S-Bus connection is used:
    The communication can not be established because the
    - cable is not correct
    - the wrong port is selected
    - the PCD does not have an S-Bus address, or there is no port assigned as S-Bus slave

Check the communication cable, serial port, if possible change of serial port (RS 232 -> RS 485)! If a http connection is used, please check whether the IP of the PCD is configured correctly.



PCD7 / D4xx (MB Panel)

Last update: 25.05.2015 07:56

First release: 22.09.2011 15:49

Views: 4641

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