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• Firewall still blocking port 53 despite listing otherwise?

  - by Tom

  I have 3 nodes with virtually the same iptables rules loaded from a bash script, but one particular node is blocking traffic on port 53 despite listing it's accepting it: $ iptables --list -v Chain INPUT (policy DROP 8886 packets, 657K bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- lo any anywhere anywhere 2 122 ACCEPT icmp -- any any anywhere anywhere icmp echo-request 20738 5600K ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT tcp -- eth1 any anywhere node1.com multiport dports http,smtp 0 0 ACCEPT udp -- eth1 any anywhere ns.node1.com udp dpt:domain 0 0 ACCEPT tcp -- eth1 any anywhere ns.node1.com tcp dpt:domain 0 0 ACCEPT all -- eth0 any node2.backend anywhere 21 1260 ACCEPT all -- eth0 any node3.backend anywhere 0 0 ACCEPT all -- eth0 any node4.backend anywhere Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 15804 packets, 26M bytes) pkts bytes target prot opt in out source destination nmap -sV -p 53 ns.node1.com // From remote server Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2011-02-24 11:44 EST Interesting ports on ns.node1.com (1.2.3.4): PORT STATE SERVICE VERSION 53/tcp filtered domain Nmap finished: 1 IP address (1 host up) scanned in 0.336 seconds Any ideas? Thanks

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• How to remove the port number from a url string

  - by Brono The Vibrator

  I have the following code snippet: string tmp = String.Format("javascript:window.open('{0}');", url); ClientScript.RegisterClientScriptBlock(this.GetType(), "NewWindow", tmp); the url generated by this code include the port number and I think that is happening becasue port 80 is used by the website and in this code I am trying to load a page from a virtual directory of the website. Any ideas on how to supress the port number in the url string generated by this code?

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• DD-WRT with both https and sshd running in port 443

  - by Bruno

  I have a buffalo router with dd-wrt v24 SP2. After setting up the basic stuff, I enabled the https access to the admin page. Several days later, while setting up remote ssh, I changed the default port from 22 to 443. And now..well :) You got the picture :) I can ssh the router but I have no web access to it's admin page. Before rushing to a cold-hearted configuration reset, is there any way to change the ssh port from a shell? Or make dd-wrt accessible thru basic http?

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• Cannot access SVN repository from another host within the LAN

  - by akaii

  I'm trying to connect to a repository I've set up on our server from another host on the same network, but the connection is failing. checkout command: svn checkout svn://192.168.11.192/ error: Can't connect to host '192.168.11.192' : Connection refused I tried probing port 3690 with telnet, and I can't seem to connect that way either. I thought the port might be blocked, so I added an entry for port 3690 in sysconfig/iptables, but it doesn't seem to have had any effect at all. I'm sure svnserve is running, because I can checkout the repository on server using the same command above. What can I possibly try next?

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• What is view port in HTML.

  - by Lakshman

  What is view port in html and give some example to access the view port details.

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• Cannot connect to HTTPS port on Ubuntu

  - by Simpleton

  I've installed a new SSL certificate and set up Nginx to use it. But requests time out when trying to hit HTTPS on the site. When I telnet to my domain on port 80 it connects, but times out on port 443. I'm not sure if there's some defaults on Ubuntu preventing a connection. UFW status shows: 443 ALLOW Anywhere netstat -a shows: tcp 0 0 *:https *:* LISTEN nmap localhost shows: 443/tcp open https The relevant block in the Nginx config is: server { listen 443; listen [::]:80 ipv6only=on; listen 80; root /path/to/app; server_name mydomain.com ssl on; ssl_certificate /etc/nginx/ssl/ssl-bundle.crt; ssl_certificate_key /etc/nginx/ssl/server.key; location / { proxy_pass http://mydomain.com; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } }

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• How to add a writable folder to the PHP document root on linux

  - by Ron Whites

  We are building an example bash script for our PHP TestCoverage Tool use on Linux. The development environment is Ubuntu 12.04_1 but we intend to have the linux example work across as many linux versions as possible without modification. The example linux script requires a variable be set to the PHP Document Root path and by default uses a small PHP example source to show the user how our GUI and text report shows the covered and uncovered PHP code areas. The linux script is also intended to be easily alterable by the user to automate the TestCoverage display of users PHP code. The problem we are having with Ubuntu 12.04 (any linux?) is that the PHP Apache2 document root is defined in /etc/apache2/sites-available/default as /var/www and /var/www is defaulted with "drwxr-xr-x" read only access. So in order to add our own folder as /var/www/SDTestCoverage we must change /var/www to "drwxrwxrwx" read-write access. So it seems our script (at least on Ubuntu) will need to ... 1. acquire and save the /var/www permissions then do .. 2. sudo chmod 777 /var/www (to make writable) 3. mkdir -p /var/www/SDTestCoverage (create our folder under the document root) 4. sudo chmod 777 /var/www/SDTestCoverage (make our subfolder writable) 5. and finally restore /var/www permissions Thanks and our Questions are .. 1. Is this the standard way (using Ubuntu) one adds a writable folder under the PHP Document Root? 2. Is this the most general purpose way one adds a writable folder under the PHP Document Root on other versions of Linux?

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• how to add a port to mysql server

  - by Shvilam

  I wont to add to mysql other tcp port that he will be lessen to and i will be able to connect to that port from my application i have duplicate my appliction and i runing them both from the same machine they both connected to the mysql server that are running on the same machine the problem is that the default port 3306 all ready taken thanks

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• Where are possible locations of queueing/buffering delays in Linux multicast?

  - by Matt

  We make heavy use of multicasting messaging across many Linux servers on a LAN. We are seeing a lot of delays. We basically send an enormous number of small packages. We are more concerned with latency than throughput. The machines are all modern, multi-core (at least four, generally eight, 16 if you count hyperthreading) machines, always with a load of 2.0 or less, usually with a load less than 1.0. The networking hardware is also under 50% capacity. The delays we see look like queueing delays: the packets will quickly start increasing in latency, until it looks like they jam up, then return back to normal. The messaging structure is basically this: in the "sending thread", pull messages from a queue, add a timestamp (using gettimeofday()), then call send(). The receiving program receives the message, timestamps the receive time, and pushes it in a queue. In a separate thread, the queue is processed, analyzing the difference between sending and receiving timestamps. (Note that our internal queues are not part of the problem, since the timestamps are added outside of our internal queuing.) We don't really know where to start looking for an answer to this problem. We're not familiar with Linux internals. Our suspicion is that the kernel is queuing or buffering the packets, either on the send side or the receive side (or both). But we don't know how to track this down and trace it. For what it's worth, we're using CentOS 4.x (RHEL kernel 2.6.9).

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• Port scanning using threadpool

  - by thenry

  I am trying to run a small app that scans ports and checks to see if they are open using and practicing with threadpools. The console window will ask a number and scans ports from 1 to X and will display each port whether they are open or closed. My problem is that as it goes through each port, it sometimes stops prematurely. It doesn't stop at just one number either, its pretty random. For example it I specify 200. The console will scroll through each port then stops at 110. Next time I run it, it stops at 80. Code Left out some of the things, assume all variables are declared where they should. First part is in Main. static void Main(string[] args) { string portNum; int convertedNum; Console.WriteLine("Scanning ports 1-X"); portNum = Console.ReadLine(); convertedNum = Convert.ToInt32(portNum); try { for (int i = 1; i <= convertedNum; i++) { ThreadPool.QueueUserWorkItem(scanPort, i); Thread.Sleep(100); } } catch (Exception e) { Console.WriteLine("exception " + e); } } static void scanPort(object o) { TcpClient scanner = new TcpClient(); try { scanner.Connect("127.0.0.1",(int)o); Console.WriteLine("Port {0} open", o); } catch { Console.WriteLine("Port {0} closed",o); } } }

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• Why is a non-blocking TCP connect() occasionally so slow on Linux?

  - by pts

  I was trying to measure the speed of a TCP server I'm writing, and I've noticed that there might be a fundamental problem of measuring the speed of the connect() calls: if I connect in a non-blocking way, connect() operations become very slow after a few seconds. Here is the example code in Python: #! /usr/bin/python2.4 import errno import os import select import socket import sys def NonBlockingConnect(sock, addr): while True: try: return sock.connect(addr) except socket.error, e: if e.args[0] not in (errno.EINPROGRESS, errno.EALREADY): raise os.write(2, '^') if not select.select((), (sock,), (), 0.5)[1]: os.write(2, 'P') def InfiniteClient(addr): while True: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) sock.setblocking(0) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # sock.connect(addr) NonBlockingConnect(sock, addr) sock.close() os.write(2, '.') def InfiniteServer(server_socket): while True: sock, addr = server_socket.accept() sock.close() server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) server_socket.bind(('127.0.0.1', 45454)) server_socket.listen(128) if os.fork(): # Parent. InfiniteServer(server_socket) else: addr = server_socket.getsockname() server_socket.close() InfiniteClient(addr) With NonBlockingConnect, most connect() operations are fast, but in every few seconds there happens to be one connect() operation which takes at least 2 seconds (as indicated by 5 consecutive P letters on the output). By using sock.connect instead of NonBlockingConnect all connect operations seem to be fast. How is it possible to get rid of these slow connect()s? I'm running Ubuntu Karmic desktop with the standard PAE kernel: Linux narancs 2.6.31-20-generic-pae #57-Ubuntu SMP Mon Feb 8 10:23:59 UTC 2010 i686 GNU/Linux

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• How to tunnel local port through proxy server?

  - by Joe Casadonte

  I have a non-proxy-aware program that I need to get working through an HTTP proxy server. The program (MYPROG) running on a machine I can configure at will (MYSRV) connects to a specific server (DESTSRV) on a specific port (DESTPRT). There is an existing HTTP proxy server (PROXYSRV:PROXYPRT) that will allow the traffic through if MYPROG was proxy-aware, but it isn't. Is there a way to listen locally on a specific port and forward the traffic through the proxy server? I can totally configure where MYPROG points to, so I could point it to MYSRV:4545 with the thought that some wonder program will redirect the data to DESTSRV:DESTPRT through PROXYSRV:PROXYPRT. I'm thinking IP Tables or netcat could do the trick if only I could figure them out... Thanks!

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• No COM1 port on hyper-v

  - by MPX

  I just made a fresh Windows 8.1 install and am trying to set-up a VM for kernel debugging. Therefore, I need to create a serial link to debug the VM using windbg. Usually I just simply add a new COM port and use it as a named pipe. However, I can't find any way to add this hardware. There is nothing relevant on the "add hardware list". What do I need to install this port then? Thanks in advance!

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• Windows Server 2008 without telnet client - how to test connecting to remote ports without installing anything new?

  - by S. Cobbs

  I'm looking to see if anyone knows of slick tricks to test connections to remote server ports from Windows server 2008 and variants that don't include the telnet client installed by default. Reason being, I sometimes have clients that want to connect to port 25 for example on a remote server and say they can't. I used to run a quick test by using "telent mailserver.tld 25" or whatever to see if I could get a response on that port. I don't want to have to install the telnet client just to test this if I dont have to - are there any other native windows utilities that will allow me to connect to a remote port?

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• virtual serial port on Arch linux

  - by Milan

  Hello, I am using Arch linux and I need to create virtual serial port on it. I tried everything but it seems doesnt work. All I want is to connect that virtual port to another virtual port over TCP and after that to use it in my python application to communicate with python application to other side. Is that posible? Please help me. Thanx

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• Windows 2008 server and Redhat with only 1 ip address, can windows route the traffic?

  - by paulcap1

  I have a two home server VMs set up. Windows 2008 server on port 80 and Centos/Redhat on port 8080. Both have separate godaddy domain name A name records pointing to them. But I cant point both domain to the same IP I only have 1 wan ip address at home. So one of my domain is forward to my IP:8080. My question: Is it possible for my windows server to redirect a certain domain name to my Linux server on port 8080? So i Have mysite1.com going to windows and mysite2.com also going to the windows server but windows would redirect mysite2.com traffic to the linux ip address:8080. I want to access both sites at my work and my work firewall is strict and will not allow domain forwarding from godaddy.

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• Git over port 443

  - by slayerIQ

  I have a git repository on my server i can ssh over port 443. But now i want to pull from that server and push to it but git gives me connection refused. I think it's connecting over port 22 but i want it to connect over 443. I use tortoiseplink to connect with how can i make it connect through port 443 when pushing or pulling ?

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• Is there an user-level accessible font table present in Linux?

  - by youngdood

  Hi again Stackoverflow! Since there is this: http://en.wikipedia.org/wiki/Code_page_437 For MSDOS, is there something similar for Linux systems? Is it possible to access that font data via userland program? I would actually just need an access to the actual bit patterns which define the font, and I would do the rendering myself. I'm fairly sure that something like this exists, but I haven't been able to find what exactly is it and how to access it. After all, e.g. text mode console font has to reside somewhere, and I really do hope it is "rawly" accessible somehow for a userland program. Before I forget, I'm programming my program in C, and have access only to the "standard" linux/posix development headers. The only thing I could came up with myself is to use the fonts in /usr/share/fonts, but having to write my own implementations to extract the data from there doesn't sound really an option; I would really want to achieve this with the least amount of bytes possible, so I feel I'm left with finding a standard way of doing this. It's not really feasible for me to store my own 8x8 ASCII-compatible font with the program either(it takes some 1024 bytes(128 chars * 8x8 bits) just to store the font, which is definitely unacceptable for the strict size limits(some < 1024 bytes for code+data) which I am working with), so being able to use the font data stored at the system itself would greatly simplify my task.

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• How to know which protocol is used in data transfer and inspect that data?

  - by user37880

  I've a .net application for windows. This application transfers a lot of data to and from a particular server on a fix port no 8888. I tried 'Tcpview' but couldn't figure out anything useful. I only figured that it uses 'tcp' connection. Is there a way to know which protocol is used for data transfer (I think port no 8888 is not specific port so not helpful)? How exactly my machine makes connection to this server? Is it telnet/http etc or what? How can I inspect the actual data which is being transferred? If data is encrypted, is it possible to know encryption method on client side (without reverse engineering)? Thanks.

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• Make a batch file that sets a VNC port (Windows)

  - by dafe

  Is there a way to make a batch file that opens up a vnc port?

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• Creating a new window that stays on top even when in full screen mode (Qt on Linux)

  - by Lorenz03Tx

  I'm using Qt 4.6.3, and ubuntu linux on an embedded target. I call dlg->setWindowState(Qt::WindowFullScreen); on my windows in my application (so I don't loose any real-estate on the touch screen to task bar and status panel on the top and bottom of the screen. This all works fine and as expected. The issue comes in when I want to popup the on screen keyboard to allow the user to input some data. I use m_keyProc= new QProcess(); m_keyProc->start("onboard -s 640x120"); This pops up the keyboard but it is behind the full screen window. The onbaord keyboards preferences are set such that it is always on top, but that seems to actually mean "except for full screen windows". I guess that makes sense and probably meets most use cases, but I need it to be really on top. Can I either A) Not be full screen mode (so the keyboard works) and programmatically hide the task bars? or B) Force the keyboard to be on top despite my full screen status? Note: On windows we call m_keyProc->start("C:\\Windows\\system32\\osk.exe"); and the osk keyboard is on top despite the full screen status. So, I'm guessing this is a difference in window mangers on the different operating systems. So do I need to set some flag on the window with the linux window manager?

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• direct url to server ip address and port

  - by AM0

  We have a Windows 2012 dedicated server. There’s a custom service running on port xxxxx which accepts connections from our custom built hardware devices over TCP/IP port. As of now we use servername.serverdomain.com:xxxxx to connect to the service and start communication. However, we prefer to use URL instead of server’s name or IP Address. So we got a custom url and set its name servers to point to dedicated server. However, just setting DNS doesn’t seem to be working. Could someone please guide as to how to get it working? UPDATE In short I want www.custom-url.com being forwarded to servername.serverdomain.com:xxxxx. These requests are coming from hardware and not browser.

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• How to set up Node server for production on own machine?

  - by Matt Hintzke

  This must be a pretty basic thing to do, but I cannot find any good guide on how to do it on the internet. I only find how to set up a development environment for Node. I want to be able to forward my R-Pi's port 80 to my Node server, which I want to obviously listen on port 80. How can I close the native port 80 so that I can let me Node server listen on that port. Ultimately, I want to be able to access my pi from any remote location. I know how to set up a static IP and forward the port on my router, but now how do I allow Node into port 80?

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• Recommend a desktop app to monitor port 80 on servers

  - by busyone

  Hello, I did some googling but was unsuccessful, so I am posting here. I am looking to get an app (preferably free/open source) to monitor my servers on port 80 that would send me an email/text when some predefined timeout triggers. I could probably write something in VB to do this but i am burried with projects, why reinvent the wheel. I know there are services out there that want you to pay $5/month to do so, I was thinking about a Windows app that would sit on my computer and simply monitor predefined list of IPs on port 80. Thanks!

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• How do I set up an IP address on a Linux VM running in VM Player so I can access it from my Windows 7 host?

  - by BradyKelly

  I have just installed an Openbravo appliance on my Windows 7 VM Player host. I am now staring at a command prompt that tells me to go to http://localhost to access the ERP system, but I cannot find any browser on the appliance. I am guessing I should rather follow their advice to configure an IP address for the Linux VM and just access that from a Windows browser on my host. How do I go about this? More specifically, How do I choose a local IP address to assign? How do I set things up so that this IP address is visible to my Windows host? Their help says to assign an DNS, to make the server visible to the internet, but internet visibility per se is not needed. How should I interpret or adapt this help for that? Finally to make the IP address available to the Internet, assign some DNS servers to it: $ echo "nameserver IP_DNS1" /etc/resolv.conf $ echo "nameserver IP_DNS2" /etc/resolv.conf

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