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• Doing port forwarding and then using it from within the internal network

  - by Ram Rachum

  We all know that by doing port forwarding on the router, computers from outside the network are able, on the specified ports, to access internal computers by targeting the external IP. I'm now replacing a TP-Link router with a D-link VDSL N 6740U router, (and copied over all the settings,) and I've noticed that one thing stopped working: With the TP-link router, you could access those port-forwarded computers from within the network, using the external IP, and they would be forwarded to the relevant computers. With the new D-Link router, it doesn't work. You might be wondering, why would you want to use the external IP and port forwarding when you're inside the internal network anyway and can just access the internal IP? One example for why this is useful: You have an iPhone app that connects to a service on an internal computer. The iPhone app knows to connect to the external IP. When we put that iPhone inside the internal network (via WiFi), it suddenly stops working, because it can't access the service from the external IP anymore. Is it an inherent property of D-Link routers that they do not allow accessing internal servers from inside the network by targeting the external IP? Or is there a way to make it work?

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• cannot read but can write on serial port through Android Emulator

  - by Aad

  I am working on a program that is communicating with serial port over USB through Android emulator. emulator -qemu -serial /dev/ttyUSB0 The emulator is able to open the port and write into it. However, read is not happening. The program has a timeout for read maintained by a timer. The read happens in a separate 'read' thread. The main thread has a socketpair fd pair to signal the read-thread that the serial port is closed post timeout. In the read-thread, polling happens(poll() function call) over the 2 file-descriptors: one is serial port fd, the other is one of the socketpair. The board that I have connected to works fine with sending commands over 'cutecom' The poll never succeeds for serial port. However, poll succeeds for 'socketpair'ed fd and the thread ends on a close-signal sent from main-thread post timeout. Ouestions: Are there any special settings for read as even loop-back fails Are there differences between settings for read and write on a serial port?

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• Securing phpmyadmin: non-standard port + https

  - by elect

  Trying to secure phpmyadmin, we already did the following: Cookie Auth login firewall off tcp port 3306. running on non-standard port Now we would like to implement https... but how could it work with phpmyadmin running already on a non-stardard port? This is the apache config: # PHP MY ADMIN <VirtualHost *:$CUSTOMPORT> Alias /phpmyadmin /usr/share/phpmyadmin <Directory /usr/share/phpmyadmin> Options FollowSymLinks DirectoryIndex index.php <IfModule mod_php5.c> AddType application/x-httpd-php .php php_flag magic_quotes_gpc Off php_flag track_vars On php_flag register_globals Off php_value include_path . </IfModule> </Directory> # Disallow web access to directories that don't need it <Directory /usr/share/phpmyadmin/libraries> Order Deny,Allow Deny from All </Directory> <Directory /usr/share/phpmyadmin/setup/lib> Order Deny,Allow Deny from All </Directory> # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog ${APACHE_LOG_DIR}/phpmyadmin.log combined </VirtualHost>

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• Error while opening port in Java

  - by Deepak

  I am getting the following error while trying to open the cash drawer. Error loading win32com: java.lang.UnsatisfiedLinkError: C:\Program Files\Java\jdk1.6.0_15\jre\bin\win32com.dll: Can't load IA 32-bit .dll on a AMD 64-bit platform The code i am using is as follows `import javax.comm.; import java.util.; /** Check each port to see if it is open. **/ public class openPort { public static void main (String [] args) { Enumeration port_list = CommPortIdentifier.getPortIdentifiers (); while (port_list.hasMoreElements ()) { // Get the list of ports CommPortIdentifier port_id = (CommPortIdentifier) port_list.nextElement (); // Find each ports type and name if (port_id.getPortType () == CommPortIdentifier.PORT_SERIAL) { System.out.println ("Serial port: " + port_id.getName ()); } else if (port_id.getPortType () == CommPortIdentifier.PORT_PARALLEL) { System.out.println ("Parallel port: " + port_id.getName ()); } else System.out.println ("Other port: " + port_id.getName ()); // Attempt to open it try { CommPort port = port_id.open ("PortListOpen",20); System.out.println (" Opened successfully"); port.close (); } catch (PortInUseException pe) { System.out.println (" Open failed"); String owner_name = port_id.getCurrentOwner (); if (owner_name == null) System.out.println (" Port Owned by unidentified app"); else // The owner name not returned correctly unless it is // a Java program. System.out.println (" " + owner_name); } } } //main } // PortListOpen`

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• Stable reverse port forwarding in SSH and stale sessions

  - by Vi

  Using VPS to forward ports behind NAT: for((;;)) { ssh -R 2222:127.0.0.1:22 [email protected]; sleep 10; } When connection is broken somehow and it is reconnecting. Warning: remote port forwarding failed for listen port 2222 Linux vi-server.no-ip.org 2.6.18-92.1.13.el5.028stab059.3 #1 SMP Wed Oct 15 13:33:44 MSD 2008 i686 I type: vi@vi-server:~$ killall sshd Connection to vi-server.org closed by remote host. Connection to vi-server.org closed. Linux vi-server.no-ip.org 2.6.18-92.1.13.el5.028stab059.3 #1 SMP Wed Oct 15 13:33:44 MSD 2008 i686 vi@vi-server:~$ Now it's OK. How it's simpler to make this automatic?

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• Forward local port or socket file to remote socket file

  - by Ninefingers

  Hi All, Quick question - I run two linux boxes, one my own desktop and the other my VPS. For security reasons on the VPS end I opted for socket connections to MySQL (/var/run/mysqld/mysql.sock). I know I can tunnel like this: ssh -L 3307:127.0.0.1:3306 [email protected] if I set up the remote sql server to listen on some port, but what I want to know is can I do something like: ssh -L /path/to/myremotesqlserver.sock:/var/run/mysqld/mysql.sock thereby tunnelling two sockets, as opposed to two ports? A perfectly acceptable solution would also be to forward a local port to the remote socket file, but where possible I'm trying not to have tcp servers running on the remote box. (and yes, I know tcp would be easier). Thanks all, Nf.

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• Cannot change port 25 to port 587

  - by Steve

  I am using outlook 2003. My email provider is Cox. Trying to change my out going port to 587 so I send mail while traveling. Others I know on Cox have done this with succes, but they are using newer version of outlook. When I go to change my existing email accounts, outlook will not allow me to change the settings. I can delete 25, but it will not allow me to type in 587. What am I doing wrong?

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• Serial port game controller (racing pedals)

  - by Cheesegraterr

  I have an old madCatz racing wheel for the playstation 2. The gas and brake pedals are connected to the wheel by a serial port. I just bought a usb racing wheel for the PC but it lacks pedals so I wanted to see if I could get these old madCatz working. I just installed the serial port in my motherboard, but now I have a problem with software. Nothing will recognize the pedal. I was wondering if there are any programs or drivers out there that will allow me to set the pedals up to work. Any advice would be appreciated!

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• virtualbox in fedora 12 ~ win xp serial port

  - by Darkoni

  i have Fedora 12 and VirtualBox 3.1.2 win xp is in virtualbox how to add serial port which will be 'physically' connected to /dev/ttyUSB0 thanx

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• Port-forwarding on livebox to router

  - by Yusuf

  Hello, At home, I have two routers, one Livebox and a Netgear. The reason why I need the Livebox is that the phone line cannot be connected to the Netgear router. So I have the Livebox connected to the phone line, the Netgear connected to the Livebox, and all PCs connected to the Netgear. My issue is that for every application or port that I want to give external access, I have to create entry in both the Livebox and the Netgear routers; so I would like to know if there's a way to automatically forward all requests to the Netgear router, from which I will then forward to the required IP:port. Thanks in advance.

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• Forwarding port to a VM - How to?

  - by Peter Gadd

  I use Win 8 Ent x64 on my PC, and I also have a Win 7 VMware virtual machine set up using a bridged network adapter. The IPv4 number for the Win 7 VM is 192.168.1.115. I require access to the VM from the Internet through port 1688. How do I set up port forwarding to achieve this? My router is a Cisco Linksys WAG120N. ========= If you require any further information to help me with this, I will gladly supply it. ========= Thanks in advance.

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• Skype Optimization - Port Forwarding on a Router

  - by user19185

  I was watching this Video which talked about using port-forwarding to optimize your LAN for skype calls. According to the video, as explained in the first couple of minutes in the video, the reason you would need optimization is because if the person your call has a firewall setup, your connection has to go-through a third-party computer to connect to them. I believe I stated this correct (maybe not). None the less, my question is this: do both parties on the call need to enable port forwarding to optimize skype, or just one party (person)?

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• Removing port forwardings programmatically on a ControlMaster SSH session

  - by aef

  Quite a while ago I got an answer telling me how to add a port-forwarding on a running SSH ControlMaster process. To know that helps a lot, but I'm still missing a way to remove such a port forwarding after I don't need that anymore. As far as I know, you can do that through the internal command key sequence on normal connections, this seems to be disabled for ControlMaster clients. Even if that would be possible I would need a solution which I can automatize with scripts, which is surely not so easy this way. Is there a way to do it? And is it easily automatizable?

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• Port forwarding no longer works

  - by Auryn

  Prior to testing an OpenVPN installation, I setup a basic VPN server using the software already built into Windows 7. Port forwarding on the Linksys router worked as normal and I was able to connect remotely. After doing an install of OpenVPN Access Server on a spare box running Ubuntu, and adding new ports to be forwarded I was unable to access the VPN from an external source as the required ports all indicated that they were closed. (During testing XRDP and VNCSERVER were also installed to facilitate access to the box) Checking back on the Windows 7 VPN resulted in no access to that vpn setup either. All ports are now reporting a being closed despite being previously open even ports that were being used for other services. Adding and removing port forwarding rules seem to have no effect. At this point, in order to troubleshoot, both the firewall and anti-virus software have been disabled on the Windows 7 machine. Could this be just a router issue? Is there any way out of this without having to reset and reconfigure the router?

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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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• 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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• 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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• 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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• 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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• 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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