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  • Prolific USB-to-Serial Comm Port significantly slower under Windows 7 comparing to Windows XP

    - by Dmitry S
    I am using a Prolific USB-to-Serial adapter based on the Prolific chip to use with a device on serial port. I have the latest version of the driver installed: 1.3.0 (2010-7-15). When I use my device with this adapter on my main Windows 7 (32bit) system it takes 8-9 seconds to send a command through to the device. However, when I do the same thing on a different Windows XP system (an old laptop I borrowed for testing) it only takes 2-3 seconds. I have made sure that the port settings and other variables are the same between systems. I also tested on a third laptop (also running Windows 7) and again got a significant delay. So the question is if anyone else experienced the same problem and found a solution. I would like to avoid moving to an XP system for what I need to achieve so that's my last option.

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  • Need IP port forwarding to access an internel service running on an internal machine

    - by appleluo
    I am trying to configure iptables to do port forwarding for certain request. The scenario is like this: Login node A can be accessed from outside Compute node B that running the service can be accessed from A but not from outside. I want to set up iptables so that a request for the service on B from outside can be accessed through A. A has two ethernet ports: Internal eth0, with ip internal_A and External eth1, with ip external_A. B has 1 ethernet port, internal eth0. let's say its ip is internal_B The service listens to internal_B:5900. We open external_A:10000 for user access. I configure my iptables with the following commands: echo 1> /proc/sys/net/ipv4/ip_forward /sbin/iptables -P FORWARD ACCEPT /sbin/iptables -t nat -A POSTROUTING -j MASQUERADE /sbin/iptables -A PREROUTING -p tcp -t nat --dport 10000 -j DNAT --to-destination interal_B:5900 /sbin/iptables -A OUTPUT -p tcp -t nat -d external_A --dport 10000 -j DNAT --to-destination internal_B:5900 But it didn't work. Can anybody help me?

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  • AT&T DSL 2701HG-B Modem, port forwarding to RealVNC

    - by Paula
    Our old cable modem could easily be set up to forward an "incoming port request" to the RealVNC software. Allowing us to log into our home computer from any location. We don't see any such configuration possiblity with our new AT&T DSL 2Wire 2701HG-B modem. (And it appears to have 2 entirely different 'set up screens'. Why?) Where is the screen that allows "forward incoming request for a certain port", to a certain computer, and direct it towards RealVNC"?

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  • Laptop with internal serial port in 2009 (and 2010)

    - by Vincent Demeester
    Are there any computer vendors (like Dell, Lenovo, or..) that still sell laptops with an internal serial port? We are using several modem and other kind of box at work that have to be used (and/or programmed) with serial port (RS232, DB9, ..). We tried many usb/pcmcia serial adapter which run fine when used to load programs on the boxes but not with modems. The protocol behind the RTC connection (with modem) need timer we are not able to reach when using an adapter (maybe until we find a very good adapter), and that leads to my question..

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  • OWB 11gR2 &ndash; Parallel DML and Query

    - by David Allan
    A quick post illustrating conventional (non direct path) parallel inserts and query using OWB following on from some recent posts from Jean-Pierre and Randolf on this topic. The mapping configuration properties is where you can define these hints in OWB, taking JP’s simplistic illustration, the parallel query hints in OWB are defined on the ‘Extraction hint’ property for the source, and the parallel DML hints are defined on the ‘Loading hint’ property on the target table operator. If we then generate the code you can see the intermediate code generated below… Finally…remember the parallel enabled session for this all to fly… Anyway, hope this helps join a few dots….

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  • Can I port forward to an established reverse ssh tunnel

    - by Ben Holness
    I have three computers, A, B and C A has initiated a reverse ssh tunnel to B: ssh -nTNx -p 443 -R 22222:localhost:22 [user]@[server] If I log in to B, I can use 'ssh -p 22222 localhost' and I get a login prompt for A. If I try 'ssh -p 22222 [public IP of B]', it doesn't work What I would like to be able to do is have C connect to A without needing to login to B. So from C I could 'ssh -p 22222 [public IP of B]' and I would get the login prompt for A. I am using debian and shorewall and I have a basic understanding of how things work. I have tried various combinations of REDIRECT and DNAT rules, but haven't had any luck. I have tried using the same port (22222) and a different port (forwarding 22223 from C to 22222 on localhost). Any ideas? Cheers, Ben

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  • Detecting/Reactivating serial port that becomes inactive on Ubuntu Linux 10.10

    - by Tom
    I am using a usb2serial port to communicate with some old equipment (using my code built upon the boost asio library - I think my code is fine because it works almost all of the time). Every so often (maybe once every few days) the communication stops with my device with no error at all - the device just does not respond. I then restart my computer and everything is fine again. Does anyone know where I can start to analyse this problem? My serial port loads up fine (in /dev/ttyUSB0) and the boost library does not throw an error. The device just does not respond. If I restart the device no change - only when I restart my pc does it make a difference. I have also tried unplugging and replugging the usb connector. Does anyone know what gets cleared in the reboot (w.r.t the serial device) or what I can probe when the problem happens again (rather than just restarting with hope)

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  • Port 53 UDP Outgoing flood

    - by DanSpd
    Hello I am experiencing very huge problem. I have 4 computers in network, and from each a lot of data is being sent to ISP name servers. Sometimes data is being sent a little from each computer in network, sometimes it is just a lot of data from one computer. I have antivirus (Avast) and malware scan (SpyBot) I know port 53 UDP is dns which resolves domain IP so its' needed. Also I have read that ISP name server might have been infected. So what is the best thing to do in this situation. Also sometimes internet starts to lag really because of port 53

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  • Conventional Parallel Inserts do Exist in Oracle 11

    - by jean-pierre.dijcks
    Had an interesting chat with Greg about said topic and searching showed the following link to discuss this topic in some detail (no reason for me to repeat this). insert /*+ noappend parallel(t1) */ into t1 select /*+ parallel(t2) */ * from t2 generates a load table conventional and does give you a parallel insert without doing a direct path insert. As this is missing from the official documentation it is probably something few people actually know existed, so kudos to Randolf Geist.

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  • webmin not working on port 10000

    - by Ali
    Hi, I posted a similar question yesterday but can't seem to find that post. I have installed webmin on my server which has SSL and its service is running but I am unable to open it in browser. I thought may be the port is blocked by server's firewall so I entered port 10000 (TCP - inbound) in APF but still no luck. When I use https://localhost:10000 on server to access webmin then it works fine but not remotely. Why is such a simple thing so hard to run? Thanks

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  • Slides for Parallel Debugging windows

    Recently I gave a talk at our Microsoft Shanghai offices on Parallel Programming so I had to update my existing Beta1 deck to Beta2 content. Specifically for Parallel Tasks and Parallel Stacks, I used 5 slides to accompany the demo.In case you are giving talks on parallelism within Visual Studio 2010, please feel free to download and use the updated parallel debugger slides (pptx).TIP: The slides have animations so be sure to F5 the deck for the full benefit and they also have text in the Comments section so be sure to see them at design time too. Comments about this post welcome at the original blog.

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  • Routing and Remote Access Port Mapping not applied to localhost

    - by Computer Guru
    Hi, I've set up Routing and Remote Access (Windows Server 2003) to forward publicip:80 to a server on the private internal network, and that's working great. Incoming requests from the internet to port 80 are correctly forwarded to our internal web server and everything is fine. However, requests on the server itself are not being forwarded. That is, if I open a console window and type "telnet publicip 80" from the server on publicip, the request is not forwarded to the private server. I understand that in RRAS I've mapped port 80 on the public interface to the private server and that's why it's not working; but I don't know how to configure it so that requests from the local PC are also forwarded to the private server. I'd appreciate any help or feedback on the matter. Thanks!

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  • Dump debugging with Parallel Stacks

    One of the areas where we fixed many bugs for Beta2 in our parallel debugging windows is with regards to managed dump debugging. So it was really cool to see Tess use the Parallel Stacks window in that scenario in her video demo with Scott.Other than the neat ability to open managed dumps in VS2010, Parallel Stacks was the only debugging feature she needed for diagnosing the issue! Check out the video, definitely worth 10 minutes of your time. Comments about this post welcome at the original blog.

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  • Port Forwarding on Actiontec GT704-WG Router Issues

    - by adamweeks
    I am trying to setup a server at customer's location that has the Actiontec GT704-WG DSL router. The port forwarding it not working at all. Here's the details: Server: OpenSuse Linux box with a static IP address of 192.168.1.200 Application running accepting connections on port 8060 Firewall disabled Local connections (within the network) working properly Router: Updated to latest firmware available DHCP range set to 192.168.1.69-192.168.1.199 to not have any conflicts with the server Firewall set to "off" Rule set in the "Applications" setting to forward 8060 TCP and UDP to 192.168.1.200 machine (I've tried using the "TCP,UDP" option as well as both individual options) I've also tried just simply putting the server in the DMZ to see if I could connect to anything, but still nothing. Looking for any clues before I call and waste hours explaining the issue to tech support.

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  • Serving static web files off a non-standard port

    - by Nimmy Lebby
    I'm close to deploying a Django project to production. I'm looking over some infrastructure decisions. Something that came up was serving static files with a different server such as lighttpd. However, we're starting off with a single dedicated server so our only option would be to use a non-standard port for the static file webserver. Is there precedence for this? I.e. Does anyone "big" do this? Any particular port I should use or shy away from using? Can anyone thing of some downsides of going this route?

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  • glassfish - Unknown error when trying port 4848

    - by Majid Azimi
    I'm installing glassfish 3.1 on Windows XP service pack 3. but in configuration step it gives this error: PERFORMING THE REQUIRED CONFIGURATIONS ______________________________________ CREATING DOMAIN _______________ Executing command :C:\glassfish3\glassfish\bin\asadmin.bat --user admin --passwordfile C:\DOCUME~1\MAJIDA~1\LOCALS~1\Temp\glassfish-3.1-windows-ml.exe6\asadminTmp1079044298673991344.tmp create-domain --savelogin --checkports=false --adminport 4848 --instanceport 8080 --domainproperties=jms.port=7676:domain.jmxPort=8686:orb.listener.port=3700:http.ssl.port=8181:orb.ssl.port=3820:orb.mutualauth.port=3920 domain1 C:\glassfish3\glassfish\bin\asadmin.bat --user admin --passwordfile C:\DOCUME~1\MAJIDA~1\LOCALS~1\Temp\glassfish-3.1-windows-ml.exe6\asadminTmp5898014821156752751.tmp create-domain --savelogin --checkports=false --adminport 4848 --instanceport 8080 --domainproperties=jms.port=7676:domain.jmxPort=8686:orb.listener.port=3700:http.ssl.port=8181:orb.ssl.port=3820:orb.mutualauth.port=3920 domain1Unknown error when trying port 4848. Try a different port number. Command create-domain failed. CLI130 Could not create domain, domain1 I change 4848 to any other port. but it doesn't work. firewall is completely disabled. Could anyone help?

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  • Port forwarding not working?

    - by rphello101
    I'm trying to set up an Apache Server to be accessed publicly. I'm using a Netgear R4500 router hooked up to a Motorola SB6121 modem. I can access my server on my computer by typing in my IP address. After following the instructions to forward port 80 so I can access the server from other computers, it does not work (see image). I get "This webpage is not available". I am forwarding to the IP address of my computer. Using this Network Port Scanner Tool, it says "80/tcp filtered http", which, as I understand it, means forwarding did not work correctly. In my Apache httpd file, I have: ServerName 192.168.1.13:80 and Listen 192.168.1.13:80 Anyone know what's wrong or have something I can try? click to enlarge

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  • xinet vs iptables for port forwarding performance

    - by jamie.mccrindle
    I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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