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• Redirecting a port to a remote server on windows

  - by Chris T

  I only have command line access to a server and I'm not allowed to disable the antivirus (which blocks netcat). What I would like to do is have a program that listens on port A and when a remote computer connects to it redirect all input/output of that socket to another server on a different port. Basically a small proxy. Is there anything that will let me do this from command line? If not I could try coding something simple that does this with C++

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• serial port parity

  - by Eric Hamilton

  Are there any known problems with using a serial port set for 8 data bits, 1 stop bit and even parity, under Windows XP?

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• port forwarding with VirtualBox

  - by Argh

  I have a virtualbox VM running ubuntu. The Ubuntu guest is running a web server which listens on port 3000 (http://127.0.0.1:3000) The host machine is windows vista. I have configured port forwarding using VBoxManage. If I query the config using VboxManage getextradata "MyMachine", I get Key: GUI/AutoresizeGuest, Value: on Key: GUI/Fullscreen, Value: off Key: GUI/LastCloseAction, Value: shutdown Key: GUI/LastWindowPostion, Value: 9,34,640,529,max Key: GUI/MiniToolBarAlignment, Value: bottom Key: GUI/MiniToolBarAutoHide, Value: off Key: GUI/SaveMountedAtRuntime, Value: yes Key: GUI/Seamless, Value: off Key: GUI/ShowMiniToolBar, Value: yes Key: VBoxInternal/Devices/pcnet/0/LUN#0/Config/guesthttp/GuestPort, Value: 3000 Key: VBoxInternal/Devices/pcnet/0/LUN#0/Config/guesthttp/HostPort, Value: 3000 Key: VBoxInternal/Devices/pcnet/0/LUN#0/Config/guesthttp/Protocol, Value: TCP This looks like it should work... However when I try to access the web server from the host machine (windows box) I dont get a response. I ran a netstat on the windows box and nothing appears to be listening on port 3000 which explains why forwrding isnt working. Note that I have already tested with my firewall switched off... The version of VirtualBox I am using is 3.1.4 Any ideas?

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• Redirect packages directed to port 5000 to another port

  - by tdc

  I'm trying to use eboard to connect to the FICS servers (http://www.freechess.org), but it fails because port 5000 is blocked (company firewall). However, I can connect to the server through the telnet port (23): telnet freechess.org 23 (succeeds) telnet freechess.org 5000 (fails) Unfortunately the port number is hardcoded (see here: http://ubuntuforums.org/archive/index.php/t-1613075.html). I'd rather not have to hack the source code as the author of that thread ended up doing. Can I just forward the port on my local machine using iptables? I tried: sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 5000 -j REDIRECT --to-port 23 and sudo iptables -t nat -I OUTPUT --src 0/0 -p tcp --dport 5000 -j REDIRECT --to-ports 23 but these didn't work... Note that: $ sudo iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source destination REDIRECT tcp -- anywhere anywhere tcp dpt:5000 redir ports 23 Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination REDIRECT tcp -- anywhere anywhere tcp dpt:5000 redir ports 23 Chain POSTROUTING (policy ACCEPT) target prot opt source destination

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• Linux: How to find all serial devices (ttyS, ttyUSB, ..) without opening them?

  - by Thomas Tempelmann

  What is the proper way to get a list of all available serial ports/devices on a Linux system? In other words, when I iterate over all devices in /dev/, how do I tell which ones are serial ports in the classic way, i.e. those usually supporting baud rates and RTS/CTS flow control? The solution would be coded in C. I ask because I am using a 3rd party library that does this clearly wrong: It appears to only iterate over /dev/ttyS*. The problem is that there are, for instance, serial ports over USB (provided by USB-RS232 adapters), and those are listed under /dev/ttyUSB*. And reading the Serial-HOWTO at Linux.org, I get the idea that there'll be other name spaces as well, as time comes. So I need to find the official way to detect serial devices. Problem is that there appears none documented, or I can't find it. I imagine one way would be to open all files from /dev/tty* and call a specific ioctl() on them that is only available on serial devices. Would that be a good solution, though? Update hrickards suggested to look at the source for "setserial". Its code does exactly what I had in mind: First, it opens a device with: fd = open (path, O_RDWR | O_NONBLOCK) Then it invokes: ioctl (fd, TIOCGSERIAL, &serinfo) If that call returns no error, then it's a serial dev, apparently. I found similar code here, which suggested to also add the O_NOCTTY option. There is one problem with this approach, though: When I tested this code on BSD Unix (i.e. OSX), it worked as well, however serial devices that are provided thru Bluetooth cause the system (driver) to try to connect to the bluetooth device, which takes a while before it'll return with a timeout error. This is caused by just opening the device. And I can imagine that similar things can happen on Linux as well - ideally, I should not need to open the device to figure out its type. I wonder if there's also a way to invoke ioctl functions without an open, or open a device in a way that it does not cause connections to be made? Any ideas?

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• Sms via a nokia phone over a serial port

  - by abigblackman

  Hi, I'm trying to send a sms via a Nokia phone over serial which is easy enough via putty. The commands from the nokia documentation works fine. However, trying to send the same commands from a c# application fails miserably. I've run Sysinternals PortMon and can see the commands come through OK, the only difference I can see is in the way it connects but I am having trouble finding the commands that would iron out those differences. The code I'm running looks a little bit like this using (SerialPort port = new SerialPort(comPort, 9600, Parity.None, 8, StopBits.One)) { port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived); port.ErrorReceived += new SerialErrorReceivedEventHandler(port_ErrorReceived); //port.ReceivedBytesThreshold = 1; port.DtrEnable = true; port.RtsEnable = true; port.ReadTimeout = 1; port.Handshake = Handshake.XOnXOff; try { port.Open(); port.WriteLine("AT"); port.WriteLine("AT+CMGF=1"); port.WriteLine("AT+CMGS=\"" + number + "\""); port.WriteLine(message); port.Write(new byte[] { (byte)26 }, 0, 1); } finally { if (port.IsOpen) { port.Close(); } } The differences I'm seeing in the trace from the serial port are At the start 0.00001844 aspnet_wp.exe IOCTL_SERIAL_SET_HANDFLOW USBSER001 SUCCESS Shake:1 Replace:43 XonLimit:4096 XoffLimit:4096 And at the very end 0.00061153 aspnet_wp.exe IOCTL_SERIAL_PURGE USBSER001 SUCCESS Purge: RXABORT RXCLEAR 0.00004442 aspnet_wp.exe IOCTL_SERIAL_PURGE USBSER001 SUCCESS Purge: TXABORT TXCLEAR Has anyone got any tips on how to iron out these issues? I also notice that the phone is not responding back to the application with any acknowledgement when I issue a command so I suspect the problem is with the connection, not those messages at the end.

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• Network vulnerability and port scanning services

  - by DigitalRoss

  I'm setting up a periodic port scan and vulnerability scan for a medium-sized network implementing a customer-facing web application. The hosts run CentOS 5.4. I've used tools like Nmap and OpenVAS, but our firewall rules have special cases for connections originating from our own facilities and servers, so really the scan should be done from the outside. Rather than set up a VPS or EC2 server and configuring it with various tools, it seems like this could just be contracted out to a port and vulnerability scanning service. If they do it professionally they may be more up to date than something I set up and let run for a year... Any recommendations or experience doing this?

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• Change the Integrated Weblogic Port number

  - by pavan.pvj

  There came a situation where I wanted to work with two JDevelopers simultaneously and start two different applications in two JDEVs. (Both of them have to in separate installation location, else it will create a problem because of system directory).Now, when we want to start WLS in JDEV, only the first one will be started and the other one fails with an exception of port conflict. Until few days back, $1million dollar question was how to change the integrated WLS port number?So, heres the answer after some R&D. In the view menu, click on "Application Server Navigator". Right click on Integrated Weblogic server.1) If it is the first time that you are trying to start the server, then there is a menu "Create Default Domain". If you click on this, a window will be displayed where it asks for the preferred port number. Change it here.2) If the domain is already created, then click on Properties and change the preferred port number.Again, if you want to change the port before starting JDEV from the file system, then goto $JDEV_USER_HOME/systemxxx/o.j2ee and open the file adrs-instances.xml and change the http-port in the startup-preferences:<hash n="startup-preferences">   <value n="http-port" v="7111"/></hash>Note 1: adrs-instances.xml will be created ONLY after you create the default domain.Note 2: systemxxx - refers to system.<JDEV version> like system.11.1.1.3.56.59 for PS2.Note 3: $JDEV_USER_HOME - in windows - would be C:\Documents and Settings\[user_name]\Application Data\JDeveloper"Now, you can run multiple Integrated WLS simultaneously. But please be aware that running more than one WLS server will degrade system performance.

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• Set serial port pin high using python

  - by morph

  Hello, Is it possible to set one pin of the serial port continuesly high using python (or C)? If yes, how? Thanks in advance

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• Linux: How to find all serial devices (ttyS, ttyUSB and others)?

  - by Thomas Tempelmann

  What is the proper way to get a list of all available serial ports/devices on a Linux system? In other words, when I iterate over all devices in /dev/, how do I tell which ones are serial ports in the classic way, i.e. those usually supporting baud rates and RTS/CTS flow control? The solution would be coded in C. I ask because I am using a 3rd party library that does this clearly wrong: It appears to only iterate over /dev/ttyS*. The problem is that there are, for instance, serial ports over USB (provided by USB-RS232 adapters), and those are listed under /dev/ttyUSB*. And reading the Serial-HOWTO at Linux.org, I get the idea that there'll be other name spaces as well, as time comes. So I need to find the official way to detect serial devices. Problem is that there appears none documented, or I can't find it. I imagine one way would be to open all files from /dev/tty* and call a specific ioctl() on them that is only available on serial devices. Would that be a good solution, though?

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• Cisco 800 series won't forward port

  - by sam

  Hello ServerFault, I am trying to forward port 444 from my cisco router to my Web Server (192.168.0.2). As far as I can tell, my port forwarding is configured correctly, yet no traffic will pass through on port 444. Here is my config: ! version 12.3 service config no service pad service tcp-keepalives-in service tcp-keepalives-out service timestamps debug uptime service timestamps log uptime service password-encryption no service dhcp ! hostname QUESTMOUNT ! logging buffered 16386 informational logging rate-limit 100 except warnings no logging console no logging monitor enable secret 5 -removed- ! username administrator secret 5 -removed- username manager secret 5 -removed- clock timezone NZST 12 clock summer-time NZDT recurring 1 Sun Oct 2:00 3 Sun Mar 3:00 aaa new-model ! ! aaa authentication login default local aaa authentication login userlist local aaa authentication ppp default local aaa authorization network grouplist local aaa session-id common ip subnet-zero no ip source-route no ip domain lookup ip domain name quest.local ! ! no ip bootp server ip inspect name firewall tcp ip inspect name firewall udp ip inspect name firewall cuseeme ip inspect name firewall h323 ip inspect name firewall rcmd ip inspect name firewall realaudio ip inspect name firewall streamworks ip inspect name firewall vdolive ip inspect name firewall sqlnet ip inspect name firewall tftp ip inspect name firewall ftp ip inspect name firewall icmp ip inspect name firewall sip ip inspect name firewall fragment maximum 256 timeout 1 ip inspect name firewall netshow ip inspect name firewall rtsp ip inspect name firewall skinny ip inspect name firewall http ip audit notify log ip audit po max-events 100 ip audit name intrusion info list 3 action alarm ip audit name intrusion attack list 3 action alarm drop reset no ftp-server write-enable ! ! ! ! crypto isakmp policy 1 authentication pre-share ! crypto isakmp policy 2 encr 3des authentication pre-share group 2 ! crypto isakmp client configuration group staff key 0 qS;,sc:q<skro1^, domain quest.local pool vpnclients acl 106 ! ! crypto ipsec transform-set tr-null-sha esp-null esp-sha-hmac crypto ipsec transform-set tr-des-md5 esp-des esp-md5-hmac crypto ipsec transform-set tr-des-sha esp-des esp-sha-hmac crypto ipsec transform-set tr-3des-sha esp-3des esp-sha-hmac ! crypto dynamic-map vpnusers 1 description Client to Site VPN Users set transform-set tr-des-md5 ! ! crypto map cm-cryptomap client authentication list userlist crypto map cm-cryptomap isakmp authorization list grouplist crypto map cm-cryptomap client configuration address respond crypto map cm-cryptomap 65000 ipsec-isakmp dynamic vpnusers ! ! ! ! interface Ethernet0 ip address 192.168.0.254 255.255.255.0 ip access-group 102 in ip nat inside hold-queue 100 out ! interface ATM0 no ip address no atm ilmi-keepalive dsl operating-mode auto ! interface ATM0.1 point-to-point pvc 0/100 encapsulation aal5mux ppp dialer dialer pool-member 1 ! ! interface Dialer0 bandwidth 640 ip address negotiated ip access-group 101 in no ip redirects no ip unreachables ip nat outside ip inspect firewall out ip audit intrusion in encapsulation ppp no ip route-cache no ip mroute-cache dialer pool 1 dialer-group 1 no cdp enable ppp pap sent-username -removed- password 7 -removed- ppp ipcp dns request crypto map cm-cryptomap ! ip local pool vpnclients 192.168.99.1 192.168.99.254 ip nat inside source list 105 interface Dialer0 overload ip nat inside source static tcp 192.168.0.2 444 interface Dialer0 444 ip nat inside source static tcp 192.168.0.51 9000 interface Dialer0 9000 ip nat inside source static udp 192.168.0.2 1433 interface Dialer0 1433 ip nat inside source static tcp 192.168.0.2 1433 interface Dialer0 1433 ip nat inside source static tcp 192.168.0.2 25 interface Dialer0 25 ip classless ip route 0.0.0.0 0.0.0.0 Dialer0 ip http server no ip http secure-server ! ip access-list logging interval 10 logging 192.168.0.2 access-list 1 remark The local LAN. access-list 1 permit 192.168.0.0 0.0.0.255 access-list 2 permit 192.168.0.0 access-list 2 remark Where management can be done from. access-list 2 permit 192.168.0.0 0.0.0.255 access-list 3 remark Traffic not to check for intrustion detection. access-list 3 deny 192.168.99.0 0.0.0.255 access-list 3 permit any access-list 101 remark Traffic allowed to enter the router from the Internet access-list 101 permit ip 192.168.99.0 0.0.0.255 192.168.0.0 0.0.0.255 access-list 101 deny ip 0.0.0.0 0.255.255.255 any access-list 101 deny ip 10.0.0.0 0.255.255.255 any access-list 101 deny ip 127.0.0.0 0.255.255.255 any access-list 101 deny ip 169.254.0.0 0.0.255.255 any access-list 101 deny ip 172.16.0.0 0.15.255.255 any access-list 101 deny ip 192.0.2.0 0.0.0.255 any access-list 101 deny ip 192.168.0.0 0.0.255.255 any access-list 101 deny ip 198.18.0.0 0.1.255.255 any access-list 101 deny ip 224.0.0.0 0.15.255.255 any access-list 101 deny ip any host 255.255.255.255 access-list 101 permit tcp 67.228.209.128 0.0.0.15 any eq 1433 access-list 101 permit tcp host 120.136.2.22 any eq 1433 access-list 101 permit tcp host 123.100.90.58 any eq 1433 access-list 101 permit udp 67.228.209.128 0.0.0.15 any eq 1433 access-list 101 permit udp host 120.136.2.22 any eq 1433 access-list 101 permit udp host 123.100.90.58 any eq 1433 access-list 101 permit tcp any any eq 444 access-list 101 permit tcp any any eq 9000 access-list 101 permit tcp any any eq smtp access-list 101 permit udp any any eq non500-isakmp access-list 101 permit udp any any eq isakmp access-list 101 permit esp any any access-list 101 permit tcp any any eq 1723 access-list 101 permit gre any any access-list 101 permit tcp any any eq 22 access-list 101 permit tcp any any eq telnet access-list 102 remark Traffic allowed to enter the router from the Ethernet access-list 102 permit ip any host 192.168.0.254 access-list 102 deny ip any host 192.168.0.255 access-list 102 deny udp any any eq tftp log access-list 102 permit ip 192.168.0.0 0.0.0.255 192.168.99.0 0.0.0.255 access-list 102 deny ip any 0.0.0.0 0.255.255.255 log access-list 102 deny ip any 10.0.0.0 0.255.255.255 log access-list 102 deny ip any 127.0.0.0 0.255.255.255 log access-list 102 deny ip any 169.254.0.0 0.0.255.255 log access-list 102 deny ip any 172.16.0.0 0.15.255.255 log access-list 102 deny ip any 192.0.2.0 0.0.0.255 log access-list 102 deny ip any 192.168.0.0 0.0.255.255 log access-list 102 deny ip any 198.18.0.0 0.1.255.255 log access-list 102 deny udp any any eq 135 log access-list 102 deny tcp any any eq 135 log access-list 102 deny udp any any eq netbios-ns log access-list 102 deny udp any any eq netbios-dgm log access-list 102 deny tcp any any eq 445 log access-list 102 permit ip 192.168.0.0 0.0.0.255 any access-list 102 permit ip any host 255.255.255.255 access-list 102 deny ip any any log access-list 105 remark Traffic to NAT access-list 105 deny ip 192.168.0.0 0.0.0.255 192.168.99.0 0.0.0.255 access-list 105 permit ip 192.168.0.0 0.0.0.255 any access-list 106 remark User to Site VPN Clients access-list 106 permit ip 192.168.0.0 0.0.0.255 any dialer-list 1 protocol ip permit ! line con 0 no modem enable line aux 0 line vty 0 4 access-class 2 in transport input telnet ssh transport output none ! scheduler max-task-time 5000 ! end any ideas? :)

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• Fedora14 serial console how-to needed

  - by lamba2

  Has anyone ever got a serial console working in fedora 14 ? Is it as simple as adding to grub: serial --unit=0 --speed=38400 terminal --timeout=10 serial console and add to the kernel lines: console=tty0 console=ttyS0,38400 ??? If so, this isn't working for me. I have agetty installed, and im using minicom, although i've heard you can also use "screen /dev/ttyUSB0" on the client side. The /etc/init/serial.conf file suggests it should be working, but nothing. Currently getting no joy from any of this after 2 days. Does anyone know a method that definitely works on fedora 14 ? (no /etc/event.d/ needed or such) edit: Client side im using a null modem cable and usb-serial adaptor.

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• "port forwarding": redirect calls to webservice at port 8081 to port 80

  - by niba

  Hi, a colleague of mine wrote a webservice that runs on port 8081 of our Windows 2008 Server. He uses the class ServiceHost, afaik this means its a standalone host (no IIS or ASP involvement). Note: I'm new into WCF ;) Now there are some issues with clients behind a firewall blocking the requests to remote port 8081 of our server (where the webservice runs). The easiest solution would be: run the webservice host at port 80 ... But: there is also a Apache 2.2 webserver running on the Windows Server, hosting some websites. By default it runs on port 80. My solution after some researching: use a virtual host to route requests to a virtual host (lets say http://webservice.[hostname]:80) to the webservice host (http://[hostname]:8081). Is this a good idea? Can Apache handle forwards to standalone webservice hosts? It would be nice if someone could lead me on to the right track :) Best regards, Niels

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• Opening port 80 in router has no results

  - by Ricardo Pieper

  A friend of mine has a ADSL modem and I need to forward some ports. I have already forwarded the 1521 port (Oracle) and it's working fine. Now I need to forward the port 80. I already set up his IIS bindings to this port, and also forwarded the port like this video shows: https://www.youtube.com/watch?v=DLKD-fyexoo So I think I did everything correctly. The local IP address is also the same as the machine where the IIS server is running. I'm sorry, but I can't post images since i don't have 10 points :( Somehow I can't forward this port, yougetsignal.com keeps saying that the door is closed. When I try to open the port, the Control Panel says me that I have to access the control panel in the 8080 port, because the 80 port will be open. Ok, that's fine. But I'm still able to access it in the 80 port, and when I try to access it in the 8080 port, it doesn't work. I'm trying it with the TPLINK 8816, but I also tried to open it in the Opticom DsLink 279, and it didn't worked (using another machine), I got the exact same results. He has a dynamic IP address, but he is also using No-ip, so I can always access his Oracle database in a certain static address. The 1521 port is open. I also tried to disable the firewall in Windows, but that makes no sense to me, since the router doesn't really open the port 80. Clearly I'm missing something. I have never done it in my life, so I dont know how to proceed. Restarting the router was the first I did, no results. I'm accessing his laptop through TeamViewer, so I'm testing the port outside his local network. Edit: My ISP says that they allow to open ports, and the 1521 port is opened. What could I do to open the 80 port?

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• Problem with sending out variable to serial port using api JAVA

  - by sjaakensjon

  We are developing a java program for school. But we are experiencing problems with sending out a variable created by 3 sliders. The idea is that we have 3 sliders. One slider for every color. Red green and blue. The variable has to have a value between 0 and 255. Everytime the value of the slider changes is has to send a variable for the channel, that value is 1, 2 ,3. And after that it has to send the value of the slider through the serial port. Could you please help us out by creating an example program? Below is our code so far. Thanks in advance. Sjaak package main; import javax.swing.*; import javax.swing.event.*; import java.awt.*; import app.Com; import app.Parameters; public class menu{ JSlider sliderblauw; JLabel hoeveelblauw; JLabel blauw; JLabel rood; JSlider sliderrood; JLabel hoeveelrood; JLabel groen; JLabel hoeveelgroen; JSlider slidergroen; public menu(){ Frame venster = new JFrame("Color control"); JPanel blauwinstel = new JPanel(); ((JFrame) venster).setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); venster.setSize(500, 500); venster.setVisible(true); sliderblauw = new JSlider(JSlider.VERTICAL, 0, 255, 0); sliderblauw.addChangeListener(new veranderingblauw()); hoeveelblauw = new JLabel ("0"); blauwinstel.add(sliderblauw); blauwinstel.add(hoeveelblauw); venster.add(blauwinstel, BorderLayout.WEST); sliderblauw.setMajorTickSpacing(10); sliderblauw.setPaintTicks(true); JPanel roodinstel = new JPanel(); sliderrood = new JSlider(JSlider.VERTICAL, 0, 255, 0); sliderrood.addChangeListener(new veranderingrood()); hoeveelrood = new JLabel ("0"); roodinstel.add(sliderrood); roodinstel.add(hoeveelrood); venster.add(roodinstel, BorderLayout.EAST); sliderrood.setMajorTickSpacing(10); sliderrood.setPaintTicks(true); JPanel groeninstel = new JPanel(); slidergroen = new JSlider(JSlider.VERTICAL, 0, 255, 0); slidergroen.addChangeListener(new veranderinggroen()); hoeveelgroen = new JLabel ("0"); groeninstel.add(slidergroen); groeninstel.add(hoeveelgroen); venster.add(groeninstel, BorderLayout.CENTER); slidergroen.setMajorTickSpacing(10); slidergroen.setPaintTicks(true); } public class veranderingblauw implements ChangeListener{ public void stateChanged(ChangeEvent ce){ int value = sliderblauw.getValue(); String waarde_blauw = Integer.toString(value); hoeveelblauw.setText(waarde_blauw); }} public class veranderingrood implements ChangeListener{ public void stateChanged(ChangeEvent ce){ int value = sliderrood.getValue(); String waarde_rood = Integer.toString(value); hoeveelrood.setText(waarde_rood); }} public class veranderinggroen implements ChangeListener{ public void stateChanged(ChangeEvent ce){ int value = slidergroen.getValue(); String waarde_groen = Integer.toString(value); hoeveelgroen.setText(waarde_groen); }} public static void main( String[] args) { new menu(); } }

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• Web Interfaces not opening even after Port Forwarding is said to be working!

  - by Ahmad

  I'm encountering this strange problem which has baffled me to the ground, and which I haven't encountered even after years of doing port forwarding .. ! I am hoping somebody here can help me solve this mystery .. :) My network configuration is as follows: I have a DSL modem (custom made and branded by my ISP) which is receiving a DSL stream ... it has an external IP which is visible to the world, say, 11.22.33.44 ... This modem has DHCP enabled, has an internal IP for itself, which is 192.168.1.1 .. it is connected to 2 laptops via and ethernet cable .. Laptop 1 has IP 192.168.1.2, and Laptop 2 has IP 192.168.1.3 ... On Laptop 1, two applications are running, jDownloader and Media Player Classic, which have their web interfaces on ports 8765 and 13579, respectively ... I can access both of these web interfaces from Laptop 2 by opening these addresses: 192.1681.2:8765 and 192.168.1.2:13579 ... both of their web interfaces open up, meaning the web interfaces are working fine .. Moving on, I now want to access these web interfaces from outside my network as well, and so I've configured port forwarding in my PTCL modem to forward all traffic on ports between 8000 and 14000 (both TCP and UDP) to IP 192.168.1.2 ... I have verified that port forwarding is working by testing it using PortForward.com's port checker tool, and this website too: [URL]http://www.yougetsignal.com/tools/open-ports/[/URL] When I use the website, if I'm running the applications on Laptop 2, the website reports that the port is open .. if I then close the application, the website reports the port is closed ... This makes sense as nothing is listening on my machine in the latter case .. Also, if I disable port forwarding in my modem, again, the website reports the port is closed ... so, the website's results seem to be okay ... Same of the above can be said when I'm used PortForward.com's port checker tool ... So again, everything okay so far ... Now, here comes the problem !! ... Despite the above tools reporting that port forwarding is working, I am unable to open the web interfaces from outside my network ... So for example, if I tried to browse 11.22.33.44:8765 or 11.22.33.44:13579, nothing opens in my browser ... But if I accessed these web server's locally from Laptop 3, by typing in 192.168.1.2:8765 or 192.168.1.2:13579, they opened ... So where is the problem here ?? The tools report unanimously that port forwarding is working, and yet I am unable to open the web interfaces from outside the network .. Also note that I have disabled the firewall from my computer, and have also made sure that any option in the above programs (whose web interfaces I am trying to open) that says only local connections are to be accepted, is disabled ... So whats the problem ... ?!! Any ideas ??

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• Linux: Simulate Serial Connection from Arduino

  - by shanet

  I'm trying to simulate the serial connection from an Arduino into a Processing applet since I don't have an Arduino at the moment. Simply, I'm trying to just send bytes from Bash to a serial connection (on /dev/ttyS0) which the Processing applet will pick up like it would from an Arduino. I tried the answer to this question: How can I send data to the serial port from a Linux shell?, but it's simply not working and I don't know how to go about debugging something like this since I've never played with serial connections before. Any advice? Thanks much.

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• Serial port access errors in WINE

  - by goldenmean

  Hello, I have a setup in which I use a USB serial adapter + some application which sends and receives data using that serial usb. But this setup which works on a Windows, or even in a VMWare Virtual windows, does not work under WINE. IT transmits data but i cannot receive data. The cable and the applications are same as in the working and non-working scenarios. I guess The fact that the application works over the USB serial cable just as fine under Virtual Windows(VMware running on linux) by mapping /dev/ttyUSB to the com port, no external software/DLL needed, means it does not need any specific driver. (Am I correct in this assumption that application doesnt need any driver?) (I also tried with a different setup(different USB serial adapter + different application under WINE, but even that does not work under WINE, but it works fine under WIndows/Virtual Windows) How can I get it working under WINE? Any pointers appreciated.

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• Remapping Linux serial port device names

  - by davefiddes

  I have a server running Debian Linux which has a built in serial port which is coming up as ttyS0. I have a plug in PCI card with two serial ports that are being registered with Linux as ttyS2 and ttyS3. Unfortunately I am trying to run some software which assumes that ttyS0 and ttyS1 are available. Is it possible to remap the serial port device names (using a udev rule?) such that ttyS0 remains as it is and ttyS2 becomes ttyS1?

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• Installing and running a guest OS on KVM-qemu with only serial console access

  - by nixnotwin

  I am trying to installing a bsd distro with virt-installer. With a Linux distro I used this: virt-install -n debian -r 1024 --vcpus=1 --accelerate -v --disk /var/kvm/installation-disks/debian.img,size=6--nographics --network=bridge:br0,model=ne2k_pci,mac=52:54:00:66:68:09 -l http://ftp.de.debian.org/debian/dists/squeeze/main/installer-amd64/current/images/ -x console=ttyS0,115200 This loads the installer directly from the online mirror. With Fedora I used this mirror: http://www.nic.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/releases/16/Fedora/x86_64/os/ Are there such mirrors for freebsd or openbsd? The reason I want direct installable ftp/http mirrors is because I can access my physical server only via ssh, and it doesn't have a X server or a window manager to give me a VNC GUI. When I tried installing centos 6 with an online mirror I was able to finish the installation via serial console, but after I rebooted it, the serial console never worked for me. I tried everything possible---editing menu.lst, inttab and securtty files. Fedora 16 booted fine from serial console, but got stuck when it loaded anaconda installer. I tried editing freebsd iso installation media by adding serial console option to boot option. And installation was successful. But couldn't boot into it becuase it wasn't giving console acess. I couldn't edit any files as ufs partition cannot be loaded with write access on my Ubuntu server 10.04. Only debian squeeze worked well, it worked for me even without editing a single configuration file. I want to have CLI versions of fedora/centos and freebsd/openbsd. But, looks like there isn't any hope for me to have them, as I have to depend on a serial console to do everything.

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• Connecting a USB laptop to a RJ45 serial port

  - by Jon

  We are about to get our first managed switch at work (Procurve 2520G-24-PoE), and this lowly programmer gets to put on his admin hat and try to configure it. The switch has an RJ45 serial port for console access. My laptop has USB ports but no serial port. In fact, there isn't a single computer in the office with a serial port. I've seen USB-to-DB9 adapters, but I need to go from USB to RJ45 (serial). How would I go about accomplishing this? Do I need two adapters? Will USB-to-DB9 and then DB9-to-RJ45 work? Thanks in advance.

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• Resetting root password on Fedora Core 3 - serial cable access only

  - by Sensible Eddie

  A little background: We have an old rackmount server running a customised version of Fedora, manufactured by a company called Navaho. The server is a TeamCAT, running some proprietary rubbish called Freedom2. We have to keep it going - the alternative is extraordinarily expensive, and the business is not likely to be running much longer to justify changing things. Through one means or another, it has fallen upon me to try and resolve our lack of root access. The previous admin has fallen under the proverbial bus, and nobody has any clue. We have no access to the root account for this server. ssh is running on the server, and there is one account admin that we can login with, however it has no permission to do anything (ironic...) The only other way into the server is with a null-modem serial cable. This works... up to a point. I can see the BIOS, I can see the post BIOS screen, and then I see "Starting grub", followed by another screen with about four lines of Linux information, but then it stops at that point. The server continues booting, and all services come online after around two minutes, but the serial terminal displays no more information. I understand it is possible to put Linux into "single user mode" to reset a root password, but I have no idea how to do this beyond trying to interrupt it at the grub stage listed above. When I have tried it just froze. It was almost like grub had appeared (since the server did not continue booting) but I couldn't see it on the serial terminal. Which made me think maybe the grub screen has some different serial settings? I don't know... it's the first time I've ever used serial for access! A friend of mine suggested trying to use a Fedora boot CD. We could boot from USB, so something along this approach is possible but again we still can only see what's going on with the serial terminal, so it might not be achievable. Does anyone have any suggestions for things I can try? I appreciate this is a bit of a long shot, but any assistance would be invaluable. *UPDATE 1 - 28/8/12 * - we will be making some attempts on this today and will post further details later!

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• Programmatically talking to a Serial Port in OS X or Linux

  - by deadprogrammer

  I have a Prolite LED sign that I like to set up to show scrolling search queries from a apache logs and other fun statistics. The problem is, my G5 does not have a serial port, so I have to use a usb to serial dongle. It shows up as /dev/cu.usbserial and /dev/tty.usbserial . When i do this everything seems to be hunky-dory: stty -f /dev/cu.usbserial speed 9600 baud; lflags: -icanon -isig -iexten -echo iflags: -icrnl -ixon -ixany -imaxbel -brkint oflags: -opost -onlcr -oxtabs cflags: cs8 -parenb Everything also works when I use the serial port tool to talk to it. If I run this piece of code while the above mentioned serial port tool, everthing also works. But as soon as I disconnect the tool the connection gets lost. #!/usr/bin/python import serial ser = serial.Serial('/dev/cu.usbserial', 9600, timeout=10) ser.write("<ID01><PA> \r\n") read_chars = ser.read(20) print read_chars ser.close() So the question is, what magicks do I need to perform to start talking to the serial port without the serial port tool? Is that a permissions problem? Also, what's the difference between /dev/cu.usbserial and /dev/tty.usbserial?

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• Serial: write() throttling?

  - by damian

  Hi everyone, I'm working on a project sending serial data to control animation of LED lights, which need to stay in sync with a sound engine. There seems to be a large serial write buffer (OSX (POSIX) + FTDI chipset usb serial device), so without manually restricting the transmission rate, the animation system can get several seconds ahead of the serial transmission. Currently I'm manually restricting the serial write speed to the baudrate (8N1 = 10 bytes serial frame per 8 bytes data, 19200 bps serial - 1920 bytes per second max), but I am having a problem with the sound drifting out of sync over time - it starts fine, but after 10 minutes there's a noticeable (100ms+) lag between the sound and the lights. This is the code that's restricting the serial write speed (called once per animation frame, 'elapsed' is the duration of the current frame, 'baudrate' is the bps (19200)): void BufferedSerial::update( float elapsed ) { baud_timer += elapsed; if ( bytes_written > 1024 ) { // maintain baudrate float time_should_have_taken = (float(bytes_written)*10)/float(baudrate); float time_actually_took = baud_timer; // sleep if we have > 20ms lag between serial transmit and our write calls if ( time_should_have_taken-time_actually_took > 0.02f ) { float sleep_time = time_should_have_taken - time_actually_took; int sleep_time_us = sleep_time*1000.0f*1000.0f; //printf("BufferedSerial::update sleeping %i ms\n", sleep_time_us/1000 ); delayUs( sleep_time_us ); // subtract 128 bytes bytes_written -= 128; // subtract the time it should have taken to write 128 bytes baud_timer -= (float(128)*10)/float(baudrate); } } } Clearly there's something wrong, somewhere. A much better approach would be to be able to determine the number of bytes currently in the transmit queue, and try and keep that below a fixed threshold. Any advice appreciated.

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• COM port on VirtualBox, XP

  - by Alex Farber

  I am using Sun VirtualBox v. 3.1.4 on WinXP. Host OS is also WinXP. In the Host Machine settings, Serial Ports, Port 1, I set: Enable Serial Port Port Number: COM1 Port Mode: Host Device Port File/Path: COM1 In the Host OS Device Manager I don't see COM1 port. What is wromg?

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