Printer FriendlyEmail Article Link

Positioning Application: PosApp reports BSD Socket messages "Debug: Could not connect UDP socket" / "Debug: Could not connect to server" / "Warning: Client error"

  • PosApp (SimGEN)
  • GSS8000


  1. Before following this article it is recommended that GSS8000 users first follow the checks outlined in article SOL10836.
  2. The following symptoms may also be accompanied by intermittent power-up issues - see article FAQ11980.


  • The following messages are likely to be seen in the message log window / message log file during the scenario arming phase
  • They may lead to the scenario not entering the running phase:-
    • Debug : BSD Socket - Could not connect UDP Socket (A socket operation was attempted to an unreachable host.). Please check network cable and settings.
    • Debug: BSD socket - Could not connect to server: connect() timed out. Please ensure server address <> is correct.
    • Warning: Could not connect to the instrument at IP address:
    • Error: Can't read response to *IDN? message from Signal Generator
    • Error: GSS8000 #8502 is not on the IEEE/IP bus
  • These types of messages can be ignored if working in "No hardware" mode
  • The following messages are likely to be seen in the message log window / message log file during a scenario run
  • They may ultimately lead to the scenario aborting:-
    • Info: Timeout in low rate wait, > 1100
    • Warning: BSD socket - Client error <An existing connection was forcibly closed by the remote host.>
    • Warning: SimGEN update task completed 16504 ms late
    • Fatal: High rate task over-run -- could not update hardware on time

  • If you notice that the loss of connection with the simulator coincides with the unit having shutdown.
    • This may be due to overheating - see article KNI10908
    • This may be due to power issues - see article KNI10910
  • If these sequences of messages are persistent then it highlights a potential fault with the CPU card, which will need to be replaced.
    • Contact Spirent Global Services using the "Submit a Service Request" link on the right hand side of the Knowledge Base page
    • Confirm your simulator model and serial number
    • Confirm the version of PosApp being used (go to menu [Help-->About])
    • Send a copy of the PosApp_message_log.txt file, after seeing the errors (ensure all message types are enabled in menu [Options-->Message Reporting])

Product : GSS8000