Large number of USB connections

I have a potential project (not currently mine, so I don't know all the details) where there are >50 BK precisions with USB outputs.  These USB outputs are ganged together into hubs, so that the number of physical PC inputs are reduced, but each instrument will still need controlled independently.  I think the measurement is likely easy (apply bias, measure current), but I have not controlled this many devices before.  How could this be managed?   Could I cycle through ports with a For Loop, taking the measurement for each device?  Any examples of this?

Actually I was "able to do something about a buggy dll", browbeat them into opening up the hood and letting me see that their dll was just a wrapper around the USB chip hardware dll from the USB chip manufacturer. I wrote LabVIEW to call this "lower level" dll directly, fixed my crashes. As mentioned, a lot of "drivers" supplied by smaller equipment makers is less than useful. I cringe when starting a project where the hardware has be already ordered when I'm told "don't worry, there are LabVIEW drivers for it!"   Yikes!
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

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    Error 2000-2009 (2001, 2002, 2005, 2006, 2009, and so on)
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  • Large number of event Log entries: connection open...

    Hi,
    I am seeing a large number of entries in the event log of the type:
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    IN: ACCEPT [57] Connection closed (Port Forwarding: TCP 192.168.1.78:14312 <-->86.128.58.172:14312 [81.154.101.160:51163] CLOSED/TIME_WAIT ppp0 NAPT)
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    IN: ACCEPT [54] Connection opened (Port Forwarding: UDP 192.168.1.78:14312 <-->86.128.58.172:14312 [81.154.101.160:41820] ppp0 NAPT)
    Are these anything I should be concerned about? I have tried a couple of forum and Google searches, but I don't quite know where to start beyond pasting the first bit of the message. I haven't found anything obvious from those searches.
    DHCP table lists 192.168.1.78 as the desktop PC on which I'm writing this.
    Please could you point me in the direction of any resources that will help me to work out if I should be worried about this?
    A slightly longer extract is shown below:
    21:49:17, 11 Mar.
    IN: ACCEPT [57] Connection closed (Port Forwarding: TCP 192.168.1.78:14312 <-->86.128.58.172:14312 [81.154.101.160:51163] CLOSED/TIME_WAIT ppp0 NAPT)
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    IN: ACCEPT [54] Connection opened (Port Forwarding: UDP 192.168.1.78:14312 <-->86.128.58.172:14312 [81.154.101.160:41820] ppp0 NAPT)
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    IN: ACCEPT [54] Connection opened (Port Forwarding: TCP 192.168.1.78:14312 <-->86.128.58.172:14312 [81.154.101.160:51163] CLOSED/SYN_SENT ppp0 NAPT)
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    IN: ACCEPT [57] Connection closed (Port Forwarding: TCP 192.168.1.78:14312 <-->86.128.58.172:14312 [213.205.231.156:51027] TIME_WAIT/CLOSED ppp0 NAPT)
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    IN: ACCEPT [54] Connection opened (Port Forwarding: TCP 192.168.1.78:14312 <-->86.128.58.172:14312 [178.190.63.75:55535] CLOSED/SYN_SENT ppp0 NAPT)
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    IN: ACCEPT [57] Connection closed (Port Forwarding: TCP 192.168.1.78:14312 <-->86.128.58.172:14312 [2.96.4.85:23939] TIME_WAIT/CLOSED ppp0 NAPT)
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    IN: ACCEPT [57] Connection closed (Port Forwarding: UDP 192.168.1.78:14312 <-->86.128.58.172:14312 [86.144.91.49:60704] ppp0 NAPT)
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    IN: ACCEPT [54] Connection opened (Port Forwarding: UDP 192.168.1.78:14312 <-->86.128.58.172:14312 [80.3.100.12:37150] ppp0 NAPT)

    Hi,
    Thank you for the response. I think, but can't remember for sure, that UPnP was already switched off when I captured that log. Anyway, even if it wasn't, it is now. So I will see what gets captured in my logs.
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49250->173.194.78.125:5222 on ppp0)
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    OUT: BLOCK [15] Default policy (First packet in connection is not a SYN packet: TCP 192.168.1.78:49266->173.194.34.101:443 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49250->173.194.78.125:5222 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49266->173.194.34.101:443 on ppp0)
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    OUT: BLOCK [15] Default policy (First packet in connection is not a SYN packet: TCP 192.168.1.78:49462->199.59.149.232:443 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49250->173.194.78.125:5222 on ppp0)
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    IN: BLOCK [12] Spoofing protection (IGMP 86.164.178.188->224.0.0.22 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49266->173.194.34.101:443 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49462->199.59.149.232:443 on ppp0)
    19:33:33, 12 Mar.
    OUT: BLOCK [15] Default policy (First packet in connection is not a SYN packet: TCP 192.168.1.78:49463->199.59.149.232:443 on ppp0)
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    IN: BLOCK [15] Default policy (UDP 111.252.36.217:26328->86.164.178.188:12708 on ppp0)
    19:33:16, 12 Mar.
    IN: BLOCK [15] Default policy (TCP 193.113.4.153:80->86.164.178.188:49572 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49266->173.194.34.101:443 on ppp0)
    19:33:14, 12 Mar.
    IN: BLOCK [15] Default policy (TCP 66.193.112.93:443->86.164.178.188:44266 on ppp0)
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    ( 164.240000) CWMP: session completed successfully
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    ( 163.700000) CWMP: HTTP authentication success from https://pbthdm.bt.mo
    19:33:05, 12 Mar.
    BLOCKED 106 more packets (because of Default policy)
    19:33:05, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49462->199.59.149.232:443 on ppp0)
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    IN: BLOCK [15] Default policy (TCP 213.1.72.209:80->86.164.178.188:49547 on ppp0)
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    OUT: BLOCK [15] Default policy (First packet in connection is not a SYN packet: TCP 192.168.1.78:49330->173.194.67.94:443 on ppp0)
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    IN: BLOCK [15] Default policy (TCP 199.59.148.87:443->86.164.178.188:49531 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49250->173.194.78.125:5222 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49266->173.194.34.101:443 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49266->173.194.34.101:443 on ppp0)
    19:32:54, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49462->199.59.149.232:443 on ppp0)
    19:32:53, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49330->173.194.67.94:443 on ppp0)
    19:32:52, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49463->199.59.149.232:443 on ppp0)
    19:32:51, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49266->173.194.34.101:443 on ppp0)
    19:32:48, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49330->173.194.67.94:443 on ppp0)
    19:32:47, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49266->173.194.34.101:443 on ppp0)
    19:32:46, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49330->173.194.67.94:443 on ppp0)
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    OUT: BLOCK [15] Default policy (First packet in connection is not a SYN packet: TCP 192.168.1.78:49461->199.59.149.232:443 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49330->173.194.67.94:443 on ppp0)
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    OUT: BLOCK [15] Default policy (First packet in connection is not a SYN packet: TCP 192.168.1.78:49398->193.113.4.153:80 on ppp0)
    19:32:42, 12 Mar.
    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49330->173.194.67.94:443 on ppp0)
    19:32:42, 12 Mar.
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    19:32:42, 12 Mar.
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49330->173.194.67.94:443 on ppp0)
    19:32:41, 12 Mar.
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    OUT: BLOCK [15] Default policy (First packet in connection is not a SYN packet: TCP 192.168.1.78:49280->119.254.30.32:443 on ppp0)
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    OUT: BLOCK [65] First packet is Invalid (TCP 192.168.1.78:49330->173.194.67.94:443 on ppp0)
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