Cannot open com port

Hi all,
maybe not entirely sure if this is a labview question, but i was using labview when it happened. I am using labview to open and run a batch file using a COM connection and an FTDI RS232 to USB. Now i believe that portion of the code runs smoothly, ive tested it out and it worked at one point. After using an instr property node to check if port is open, which i now know cant be used on non ni devices anyways, it will not open to run the batch file. I have run it from command prompt and i get a communcation port cant be open error. Now i moved one of these devices from COM16 to COM2 and it works perfectly now, but the other one wont work at all and why should i have to change port numbers? any tips or troubleshooting advice?

Just in case anyone out there runs into the same problem, i followed this link here, uninstalled all com ports, then reinstalled com ports and is now functioning properly. But it seems that my port 18 which was not working before is still not working.
http://theitbros.com/how-to-delete-com-ports-in-use/

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Cannot open local port whatever

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Err, well, if they are both acting as servers, that's right. If you are running them on the same machine, then the first one takes port 4000 and the second one can't use it. I would think they would take 2 sets of IP and port, one for it's server port, one for it to connect to the other side...
however, I wouldn't think that the transmitter app would be using a server port. You should be starting the receiver first.
Or something else is using that port. Another receiver you started but didn't start, maybe? Some other app? It shouldn't matter what port you use. Try something else (4001, 4002, etc).

Cannot open any ports, they are ALL stealth.

After spending hours on end trying to open the port 25565 on my Mac and finding that it was always closed I decided to use a different port checker now if I check my ports on Shields Up! 'https://www.grc.com/x/ne.dll?bh0bkyd2' it says ALL ports are stealth no matter which I try. How can I 'un-stealth' the port 25565 and open it. On my router's homepage (BTHOMEHUB3 (A)) it says I have set up the port correctly and that it has been applied. Any help would be greatly apprieciated.

I assume you're trying to get a process to listen on that port. If so, deactivate the built-in firewall and any third-party firewall you may have installed. If your router has a firewall, deactivate that too.

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I have been using a WRT54G for quite some time, I find it does the job smoothly and quickly...
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Hi
The reason for the error is
The ip address (+port) is not same for both these operations
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Changing active/passive mode settings might help (as a common solution).
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Try This...
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Let's double-check your Port Mapping setup on the 802.11n AirPort Extreme Base Station (AEBSn) ...
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I currently use a iMac OS X 10.6.8 and I cannot open iPhoto. Every time I click on iPhoto the coloured wheel comes up and lets me go no further, leaving me with no other option but to force quit the application. HELP!!

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Cannot open com port

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