Discovery Troubleshooting

I'm trying to troubleshoot discovery of my T7 device.  This part from the troubleshooting app not perfectly describes my situation:

4. Connection is fine, and a direct TCP open works, but a Kipling or LJCP search does not find the device:
Kipling and LJControlPanel use a UDP broadcast to attempt to find all T7s or UE9s on the network but with certain networks this does not work.  For LJControlPanel you will have to use a direct TCP open.  For Kipling you will have to use LJM Special Address configuration together with devices addressed by static IP

I'd like to know what network configurations cause this error.  I've tried on two different networks (work and i tried at home as well), but neither could discover the T7.  Most of the time I just get nothing, and then can connect fine.  Other times I get 1298 LJME_ATTR_LOAD_COMM_FAILURE.  I'm trying to figure out whether my issue is with my laptop, the networks, or the T7 (as that error message description seems to indicate).

python snip (combo of two different examples

def displayDeviceInfo(functionName, info):
    print("\n%s found %i LabJacks:\n" % (functionName, info[0]))
    fmt = ''.join(["{%i:<18}" % i for i in range(0, 4)])
    print(fmt.format("Device Type", "Connection Type", "Serial Number", \
                            "IP Address"))
    for i in range(info[0]):
        print(fmt.format(DEVICE_TYPES.setdefault(info[1][i], str(info[1][i])), \
              CONN_TYPES.setdefault(info[2][i], str(info[2][i])), \
              str(info[3][i]), \
              ljm.numberToIP(info[4][i])))
    print("")
    print("***End***")
    print("")

if __name__ == "__main__":

    #listAll and listAllS returns the tuple (numFound, aDeviceTypes,
    #aConnectionTypes, aSerialNumbers, aIPAddresses)

    #Find and display LabJack devices with listAllS.
    info = ljm.listAllS("ANY", "ANY")
    displayDeviceInfo("listAllS", info)

    #Find and display LabJack devices with listAll.
    info = ljm.listAll(ljm.constants.ctANY, ljm.constants.ctANY)
    displayDeviceInfo("listAll", info)

    #Connect to a specific device, get info and disconnect
    handle = ljm.open(ljm.constants.dtT7, ljm.constants.ctWIFI,"192.168.2.123")
    info = ljm.getHandleInfo(handle)

    print("Opened a LabJack with Device type: %i, Connection type: %i,\n" \
        "Serial number: %i, IP address: %s, Port: %i,\nMax bytes per MB: %i" % \
        (info[0], info[1], info[2], ljm.numberToIP(info[3]), info[4], info[5]))

listAllS found 0 LabJacks:

Device Type       Connection Type   Serial Number     IP Address

***End***


listAll found 0 LabJacks:

Device Type       Connection Type   Serial Number     IP Address

***End***

Opened a LabJack with Device type: 7, Connection type: 4,
Serial number: 470012349, IP address: 192.168.2.123, Port: 502,
Max bytes per MB: 500
Press any key to continue . . .