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• can't find port 22 traffic under VirtualBox

  - by telliott99

  I'm trying to learn to use tcpdump. I thought I'd eavesdrop on my ssh login. The setup is a bit unusual, I have OS X Lion running VirtualBox, with Ubuntu running in the VM. I have ssh enabled and can login from OS X normally: > ssh -p 22 10.0.1.2 -l telliott Welcome to Ubuntu 11.10 (GNU/Linux 3.0.0-17-generic i686) * Documentation: https://help.ubuntu.com/ 0 packages can be updated. 0 updates are security updates. Last login: Sat Mar 31 19:54:36 2012 from toms-mac-mini.local telliott@U32:~$ logout Connection to 10.0.1.2 closed. > I have not obfuscated the ssh port on Ubuntu. From OS X, stroke gives what I expect: > ./stroke 10.0.1.2 22 22 Port Scanning host: 10.0.1.2 Open TCP Port: 22 ssh So from OS X I do: > sudo tcpdump -i en1 -v port 22 Password: tcpdump: listening on en1, link-type EN10MB (Ethernet), capture size 65535 bytes Then I login from OS X to Ubuntu using ssh, but I see nothing with tcpdump. Here is ifconfig from Ubuntu: telliott@U32:~$ ifconfig eth1 Link encap:Ethernet HWaddr 08:00:27:d7:ba:0e inet addr:10.0.1.2 Bcast:10.0.1.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fed7:ba0e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:799 errors:0 dropped:0 overruns:0 frame:0 TX packets:465 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:96863 (96.8 KB) TX bytes:68638 (68.6 KB) Where are the packets I was hoping to see? Thanks for any help.

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• .htaccess blocking images on some internal pages

  - by jethomas

  I'm doing some web design for a friend and I noticed that everywhere else on her site images will load fine except for the subdirectory I'm working in. I looked in her .htaccess file and sure enough it is setup to deny people from stealing her images. Fair Enough, except the pages i'm working on are in her domain and yet I still get the 403 error. I'm pasting the .htaccess contents below but I replaced the domain names with xyz, 123 and abc. So specifically the page I'm on (xyz.com/DesignGallery.asp) pulls images from (xyz.com/machform/data/form_1/files) and it results in a forbidden error. RewriteEngine on <Files 403.shtml> order allow,deny allow from all </Files> RewriteCond %{HTTP_REFERER} !^http://xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://xyz.com/machform/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://xyz.com/machform/data/form_1/files/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://abc.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://abc.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://abc.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://abc.xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://123.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://123.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://123.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://123.xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com/machform/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com/machform/$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com/machform/data/form_1/files/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.abc.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.abc.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.abc.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.abc.xyz.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.123.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.123.com$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.123.xyz.com/.*$ [NC] RewriteCond %{HTTP_REFERER} !^http://www.123.xyz.com$ [NC] RewriteRule .*\.(jpg|jpeg|gif|png|bmp)$ - [F,NC] deny from 69.49.149.17 RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^vendors\.html$ "http\:\/\/www\.xyz\.com\/Design_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^vendors\.asp$ "http\:\/\/www\.xyz\.com\/Design_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^ArtGraphics\.html$ "http\:\/\/www\.xyz\.com\/Art_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^ArtGraphics\.asp$ "http\:\/\/www\.xyz\.com\/Art_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^Gear\.asp$ "http\:\/\/www\.xyz\.com\/Gear_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^Gear\.html$ "http\:\/\/www\.xyz\.com\/Gear_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^NewsletterSign\-Up\.html$ "http\:\/\/www\.xyz\.com\/Newsletter\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^NewsletterSign\-Up\.asp$ "http\:\/\/www\.xyz\.com\/Newsletter\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^KidzStuff\.html$ "http\:\/\/www\.xyz\.com\/KidzStuff1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^KidzStuff\.asp$ "http\:\/\/www\.xyz\.com\/KidzStuff1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^Vendors\.html$ "http\:\/\/www\.xyz\.com\/Design_Gallery_1\.htm" [R=301,L] RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^Vendors\.asp$ "http\:\/\/www\.xyz\.com\/Design_Gallery_1\.htm" [R=301,L]

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• IIS 7 rewriting subdomain to point at a specific port

  - by Tommy Jakobsen

  Having installed Team Foundation Server 2010 on Windows Server 2008, I need an easy URL for our developers to access their repositories. The default URL for the TFS repositories is http://localhost:8080/tfs Now I want the subdomain domain tfs.server.domain.com to point at http://localhost:8080/tfs. And when you access tfs.server.domain.com/repos_name it should redirect to http://localhost:8080/tfs/repos_name. How can I do this in IIS7? I already tried using the following rule, but it does not work. I get a 404. <rewrite> <globalRules> <rule name="TFS" stopProcessing="true"> <match url="^(?:tfs/)?(.*)" /> <conditions> <add input="{HTTP_HOST}" pattern="^tfs.server.domain.com$" /> </conditions> <action type="Rewrite" url="http://localhost:8080/tfs/{R:1}" /> </rule> </globalRules> </rewrite> EDIT I actually got this working by adding a binding for the site on port 80 with host name tfs.server.domain.com. But using tfs.server.domain.com, I can't authenticate using Windows Authentication. Is there something that I need to configure for Windows Authentication? You can see a trace here: http://pastebin.com/k0QrnL0m

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• How to Read Device Data From COM

  - by Aamir Khurshid

  I have one device which sends data on COM port say on COM13, now i want to read that data and display it in the RichtextBox or in any text control , i have written the application with the help of IO and IO.Ports but comport.DataRecived event does not fire,even though device is sending data on that port, I have some software on which i define the port number and it successfully display data ,which insure me that data is reciving on the Port but i am unable to recive, is there any way i can read data? Regards, Aamir

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• mod_jk problem: Tomcat is probably not started or is listening on the wrong port

  - by Konrad

  Hi, I am running some application on Tomcat 6.0.26. There is Apache in front of web server talking to it over mod_jk. Every few hours when I try to access application browser simply spins, and no content is retrieved. No error is reported in Tomcat logs, but I fond such errors in mod_jk log: [Sun Jul 04 21:19:13 2010][error] ajp_service::jk_ajp_common.c (1758): Error connecting to tomcat. Tomcat is probably not started or is listening on the wrong port. worker=***** failed [Sun Jul 04 21:19:13 2010][info] jk_handler::mod_jk.c (1985): Service error=0 for worker==***** [Sun Jul 04 21:19:13 2010][info] ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46 [Sun Jul 04 21:19:13 2010][info] ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46 [Sun Jul 04 21:19:13 2010][info] ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46 [Sun Jul 04 21:19:13 2010][error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet) [Sun Jul 04 21:19:13 2010][error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet) [Sun Jul 04 21:19:13 2010][info] ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46 [Sun Jul 04 21:19:13 2010][error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet) [Sun Jul 04 21:19:13 2010][info] ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 45 [Sun Jul 04 21:19:13 2010][info] ajp_connection_tcp_get_message::jk_ajp_common.c (955): Tomcat has forced a connection close for socket 46 [Sun Jul 04 21:19:13 2010][info] ajp_service::jk_ajp_common.c (1721): Receiving from tomcat failed, recoverable operation attempt=0 my worker is configured in following way: worker.admanagonode.port=8009 worker.admanagonode.host=*****.com worker.admanagonode.type=ajp13 worker.admanagonode.ping_mode=A worker.admanagonode.socket_timeout=60 worker.admanagonode.prepost_timeout=10000 worker.admanagonode.connect_timeout=10000 worker.admanagonode.connection_pool_size=200 worker.admanagonode.connection_pool_timeout=300 worker.admanagonode.retries=20 worker.admanagonode.socket_keepalive=1 worker.admanagonode.cachesize=10 worker.admanagonode.cache_timeout=600 Tomcat has same port number in Connector configuration: <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" address="*********" /> Does any of you has any ideas what i am missing? What can cause such problems? Cheers Konrad

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• iptables port forwarding works only for localhost

  - by Venki

  Below is my iptables config. I used this for my accessing a node js website running in port 9000 through port 80. This works fine only if access the website through local host / loop back. When I try to use the ip of eth0, which is assigned by my router through dcp. this does not work, when I use ip like 192.168.0.103 to access the website. I am not able to figure what is wrong here, Already burnt a day in this, still not able to figure out :( Edit: ( more information) Earlier, I was using this configuration to develop the website, i had configured the domain name to point to 127.0.0.1 in the /etc/hosts file. It was working fine, but now I am trying to deploy the website in a vps with static ip, This configuration does not work with both static IP. # redirect port 80 to port 9000 *nat :PREROUTING ACCEPT [57:3896] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [4229:289686] :POSTROUTING ACCEPT [4239:290286] -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 9000 -A OUTPUT -d 127.0.0.1/32 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 9000 COMMIT # Allow HTTP and HTTPS connections from anywhere (the normal ports for websites and SSL). -A INPUT -p tcp --dport 80 -j ACCEPT -A INPUT -p tcp --dport 443 -j ACCEPT -A INPUT -p tcp --dport 9000 -j ACCEPT -A INPUT -j REJECT

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• Qt Serial Port Errors - Data not getting read

  - by user2970546

  I'm trying to read a serial port with the Qt SerialPort library. I can read the data using HyperTerminal. In Qt I used the following code to try and do the same thing. Qt says the the port has been opened correctly, but for some reason, the bytesAvailable from the serial port is always 0. serial.setPortName("COM20"); if (serial.open(QIODevice::ReadOnly)) qDebug() << "Opened port " << endl; else qDebug() << "Unable to open port" << endl; serial.setDataBits(QSerialPort::Data8); serial.setParity(QSerialPort::EvenParity); serial.setBaudRate(QSerialPort::Baud115200); qDebug() << "Is open?? " << serial.isOpen(); // Wait unit serial port data is ready while (!serial.bytesAvailable()) { //qDebug() << serial.bytesAvailable()<<endl; continue; } QByteArray data = serial.read(100); qDebug() << "This is the data -" << data << endl; serial.close(); In comparison, MATLAB code with the same structure as the above code, successfully manages to read the serial port data %Serial Port Grapher - Shurjo Banerjee s = serial('COM20'); s.BaudRate = 460800; s.Parity = 'even'; try input('Ready to begin?'); catch end fopen(s); fh = figure(); hold on; t = 1; while (s.BytesAvailable <= 0) continue end a = fread(s, 1) old_t = 1; old_a = a; while true if (s.BytesAvailable > 0) a = fread(s, 1) figure(fh) t = t + 1; plot([old_t t], [old_a a]); old_t = t; old_a = a; end end fclose(s);

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• Wamp Server: Multiple Virtual Hosts are not working on Windows.

  - by Awan

  I have two virtual hosts on windows(for example: test1.dev and test2.dev). But it always load content of test1.dev for both virtual hosts. Following are my files: hosts: 127.0.0.1 localhost 127.0.0.1 test1.dev 127.0.0.1 test2.dev httpd.conf: <IfModule ssl_module> SSLRandomSeed startup builtin SSLRandomSeed connect builtin </IfModule> Include "c:/wamp/alias/*" <VirtualHost 127.0.0.1> ServerName test1.dev DocumentRoot "C:\wamp\www\test1\public" </VirtualHost> <VirtualHost 127.0.0.1> ServerName test2.dev DocumentRoot "C:\wamp\www\test2\public" </VirtualHost> Can someone recognize the problem ?

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• another "SSH connect to host github.com port 22: Bad file number"

  - by Mariusz

  Hello. I have a problem with my first-time ssh connection. Yes, I've already done yours guides, already tried your "Dealing with firewalls and proxies" article and the problem is still occuring. I am using Win7 32bit, Windows Firewall is disabled, haven't any third-party firewalls, ESET Nod32 Antivirus is not blocking any ports, I am not using any PROXY (neither local proxy) . Here goes the logs: Ordinary SSH connection try C:\Users\Mariusz>ssh -vvv git@github.com OpenSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007 debug2: ssh_connect: needpriv 0 debug1: Connecting to github.com [207.97.227.239] port 22. debug1: connect to address 207.97.227.239 port 22: Not owner ssh: connect to host github.com port 22: Bad file number NCAT connection try C:\Users\Mariusz>ncat github.com 22 Strange connect error from 207.97.227.239 (10013): No error 10013 = WSAEACCES I think that method called "smart-http-support" won't be usable for me because I haven't created repo yet. I have just GIT INIT locally, and finished at step GIT PUSH, which returns the same: ssh: connect to host github.com port 22: Bad file number fatal: The remote end hung up unexpectedly corkscrew method (first article from yours guide) . While PUTTYing (with pageant in bg), after inputing login - an error is occuring (MessageBox): Disconnected: No supported authentication methods available And in terminal such message is printing out: Server refused our key Key I have generated correctly, using ssh-keygen. I tried not method by editing ~/.ssh/config yet because I had thought that because I haven't PUSHed anything to my remote repo so I won't be able to CLONE anything. Method called ssh-forwarding is not for my, cause it "requires access to an external ssh server" and I haven't any at this time. What else could I do? Thanks in advance for any help. Mariusz.

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• Windows XP can use a wired network port, but MacBook (OS X) fails on the same port

  - by Dean Hill

  I wired the Cat5 in my house seven years ago. The wired ports have worked fine with both my Windows XP laptop and MacBook. My wireless network also works fine, but I like to use wired occasionally. One of the Cat5 runs wasn't terminated with a jack, so I recently terminated this wire with a port/jack on the wall end and a standard Cat5 plug on the end that plugs into my router. This is the same setup as my other runs. Unfortunately, the MacBook isn't working well with the new wired port. The OS X Network System Preferences show the IP, Subnet, Router, etc., and everything looks fine. A "netstat -ibd" shows no errors or dropped packets. However, when I open a page in Safari, the status says "Contacting 'www.google.com'" and appears to hang. If I wait for a couple minutes, part of the Google page starts to display, but it is still not the full page load. When I use a Windows XP laptop on the same wired port, everything works fine. An internet speed test shows good results and all web pages load fine. A "netstat -e" under Windows shows no errors. I've used a Cat5 tester, and the cable tests fine (wires 1-8 light up in sequence). I've replaced both the port/jack and the connector twice to make sure I wired things correctly. I'd really like this Cat5 to work with the MacBook (and I'm trying to avoid running a new length of cable). Any ideas what the problem could be?

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• Apache: rewrite port 80 and 443 - multiple SSL vhosts setup

  - by Benjamin Jung

  SETUP: multiple SSL domains are configured on a single IP, by using vhosts with different port numbers (on which Apache listens) Apache 2.2.8 on Windows 2003 (no comments on this pls) too many Windows XP users so SNI isn't an option yet There may be reasons why it's wrong to use this approach, but it works for now. vhosts setup: # secure domain 1 <VirtualHost IP:443> SSL stuff specifying certificate etc. ServerName domain1.org </VirtualHost> # secure domain 2 <VirtualHost IP:81> SSL stuff for domain2.org ServerName domain2.org </VirtualHost> GOAL: Some folders inside the domain2.org docroot need to be secure. I used a .htaccess file to rewrite the URL to https on port 81: RewriteEngine On RewriteCond %{SERVER_PORT} !^81$ RewriteRule (.*) https://%{HTTP_HOST}:81%{REQUEST_URI} [R] Suppose I put the .htaccess in the folder 'secfolder'. When accessing http://domain2.org/secfolder this gets succesfully rewritten to https://domain2.org:81/secfolder. ISSUE: When accessing https://domain2.org/secfolder (without port 81), the certificate from the first vhost (domain1.org) is used and the browser complains that the site is insecure because the certificate is not valid for domain2.org. I thought that RewriteCond %{SERVER_PORT} !^81$ would also rewrite https://domain2.org to https://domain2.org:81, but it doesn't. It seems that the .htaccess file is not being used at all in this case. At this point I am not sure how to apply a RewriteRule to https://domain2.org. I tried creating an additional vhost for domain2 on port 443 before the one for domain1.org, but Apache seems to choke on that. I hope someone of you has an idea how to approach this. TIA.

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• Dos/ Flood Lag even though Port not Saturated

  - by Asad Moeen

  My GameServers had been under some UDP Floods due to which they generated outputs to the attacker which gave the GameServers some huge lags. Thanks to friends at ServerFault that upon different kind of testing, I was able to successfully block the attack. My question is actually something else but it is important to know how the GameServers reacted to the attack and if the machine kept stable or not: 300kb/s Input would cause GameServer to generate 2mb/s Output. So as the Input Rate kept increasing, output rate would reach so high that it would no longer be possible for the GameServer to control it and hence it would give a huge Lag until the attack is stopped. Usually the game server starts to lag when it sends out something greater than 5mb/s and under that is controllable. Theoretically, I was able to receive a 60mb/s output from my GameServer on inputting 10mb/s. Its just the way the GameServer works if not protected. Now on some of my machines, only the GameServer under attack lagged and although the server was generating 60mb/s output, rest of the gameservers on other ports would run fine without lags on the same machine. But there was another machine which also runs on a 100 MBPS Network port, even 1 mbps input ( and ZERO output because attack is blocked ) even on an unused port would give a constant yellow line ( on the Lag-o-Meter ) to all the clients on all GameServers indicating lag because that line is actually blue under normal conditions. It would remain the same even on 50mbps or 900mbps input. I tried contacting the host about it because I believe its the way their Network is bridged, but they can't help me about it. Anyone else knowing about such issues because if 900mbps input does not Saturate the port, how can 1mbps input lag the servers although port is not saturated and enough bandwidth is available?

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• Typical outbound port list for guest access?

  - by Steve

  I manage a weekly rental house that includes wireless Internet access. I've allowed all outbound ports on my router but my ISP has disabled my Internet access twice now because guests have downloaded (or served up) copyrighted content. So I'd like to institute some port filtering to discourage p2p sharing (see disclaimer below). But I don't want to inconvenience the 99.9% of folks who keep things above-board. My question is, what outbound ports are typically open for rental/hotel wireless Internet access, or where can I find such a list? TCP 80,443,25,110 at a minimum. Though my own email service uses 995 and 465 for SSL, some may use IMAP, I personally use SSH and FTP, so I'll open those. Roughly I figure I need to open access to privileged ports, and close 1024 & above. Is there a whitelist I should institute for commonly used high ports? And does it make sense to block UDP 1024 ? Disclaimer: I realize anyone replying to this message could circumvent the port filtering and share content to their heart's content. I do not need comprehensive p2p blocking, which requires more than a port whitelist. Anyone staying at the house shoulders the responsibility for their Internet use, per the rental contract. Also anyone savvy enough to circumvent the port filters would hopefully be savvy enough to use some sort of peer blocking, thereby preventing the ISP from taking down the service.

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• both ssl and non-ssl on single port

  - by Zulakis

  I would like to make my apache2 webserver serve both http and https on the same port. With the different method i tried it was either not working on http or on https.. How can I do this? Update: If I enable SSL and then visit the with http I get page like this: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>400 Bad Request</title> </head><body> <h1>Bad Request</h1> <p>Your browser sent a request that this server could not understand.<br /> Reason: You're speaking plain HTTP to an SSL-enabled server port.<br /> Instead use the HTTPS scheme to access this URL, please.<br /> <blockquote>Hint: <a href="https://server/"><b>https://server/</b></a></blockquote></p> <hr> <address>Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny16 with Suhosin-Patch mod_ssl/2.2.9 OpenSSL/0.9.8g Server at server Port 443</address> </body></html> Because of this, it seems very much possible to have both http and https on the same port. A first step would be to change this default-page so it would present a 301-Moved header. Update2: According to this, it is possible. Now, the question is just how to configure apache to do it.

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• Proxychains, Tortunnel, Privoxy: cannot connect() to port

  - by Benjamin

  Hi all, I'm trying to do an nmap scan through tor using tortunnel, privoxy and proxychains like explained in the following video: http://vimeo.com/6238958 I'm getting rather weird results. I can successfully perform any SYN scan on any port. However as soon as I try to do connect() scans, proxychains cannot connect itself to all ports. In other words, I can perform connect() scans to port 80: proxychains nmap -P0 -A -sV www.zzz.com -p80 but not port 21: proxychains nmap -P0 -A -sV www.zzz.net -p21 I get the following error: Starting Nmap 4.62 ( http://nmap.org ) at 2010-06-02 08:34 UTC ProxyChains-2.1 (http://proxychains.sf.net) random chain (1):....127.0.0.1:5060....can't connect to..113.I2.1W1.YY:21 random chain (1):....127.0.0.1:5060....can't connect to..113.I2.1W1.YY:21 random chain (1):....127.0.0.1:5060....can't connect to..113.I2.1W1.YY:21 random chain (1):....127.0.0.1:5060....can't connect to..113.I2.1W1.YY:21 random chain (1):....127.0.0.1:5060....can't connect to..113.I2.1W1.YY:21 random chain (1):....127.0.0.1:5060....can't connect to..113.I2.1W1.YY:21 My only guess would be that the exit node I'm using does not allow connections to port 21. Would that be correct? How could I fix it? Thanks for your time.

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• How to configure CISCO switch 2960 for port-based address allocation on a single port only?

  - by Jack

  CISCO 2960 allows you to configure so-called Port-Based address allocation. It makes the switch to associate IP address it is giving out via DHCP with port-identifier, which is random, switch created identifier. In practice it means that any machine connected to such configured port will always get the same IP address, regardless of what that machine's MAC address is. I want to have that feature configured on --some ports-- only. But no matter what commands I try it seems that this can only be done for all ports, all for none. Even though CISCO manual seems to indicate there's both global and per-port command to enable that. Here are relevant commands from CISCO manual: configure terminal ip dhcp use subscriber-id client-id (this configures the DHCP server to globally use the subscriber ID as the client ID on all incoming DHCP messages) interface FastEthernet0/1 ip dhcp server use subscriber-id client-id (Optional: Configures the DHCP server to use the subscriber ID as the client ID on all incoming DHCP messages on the interface) but it appears if I configure only per-interface than there's no effect at all, if I configure globally and per interface - CISCo behaves as if all ports were configured to use that feature. Any ideas?

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• Can't access Port 80 from external

  - by dewacorp.alliances

  Hi there I have configuration like this: NETGEAR MODEM LINKSYS ROUTER SERVERS In the modem, I've setup as bridging and all the traffic is controlling by this ROUTER. Prior to this setup, I can access website from external (port 80) plus exchange servers (mail) and https. But now with this configuration, I can only send/receive using Exhcange servers and access OWA (Outlook web access using port 443) .... and no internal websites from outside. This is my config for LINKSYS ROUTER Application | Start | End | Protocol | IP Address Ms Exchange | 25 | 25 | Both (TCP/UDP) | 192.168.100.8 Internets | 80 | 80 | Both (TCP/UDP) | 192.168.100.11 SSL | 443 | 443 | Both (TCP/UDP) | 192.168.100.8 Exchange | 110 | 110 | Both (TCP/UDP) | 192.168.100.8 192.168.100.11 is a UBUNTU web server that running the apache which controlling the virtual name (extranet, cms, test) to redirect to the different servers. As you can see, the home internet is only allowing public IP address. Now I test this schenarion in internal network work nicely. For instance. If I type in extranet.XXX.local it goes to the right applicatios or if I try CMS.XXX.local again it goes to the right one. I also asked to ISP just in case if they are blocking the inbound port 80 for unknown reason. They said no. So I didn't understand why this happens. I suspect the configuration that I have between MODEM ROUTER but I counldn't work what it is. I don't have a documentation of previous settings and I don't know if there is a port that I need to open as well. I am appreciated your comment

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• Tomato/DD-WRT router to act as switch & only NAT some port

  - by fseto

  BACKGROUND: I have a device that must use a real IP address. Currently, my ISP uses DHCP and I can have up to 4 real IP address assigned. However, the cable modem only have 1 ethernet port and it's connected to my router (running Tomato, but can run DD-wrt or other Openwrt if required). Question stems from how I can connect the additional device, requiring a real IP? EASY SOLUTION: would be to get a switch and connect to the CM, Router, and Device. But alas, I want to avoid this route, since: my wiring cabinet in my home is drawing lots of power and heat already Device will be unprotected by any firewall unable to monitor the traffic to/from device. Besides, what would be the FUN in that? =) IDEA: So what I want to do is to configure the router, so that one of the switchport is removed from the normal br0 bridge. Instead, I want to make it behave like a switch on the WAN port. What's the best way of doing this? Should I create another bridge on the WAN & the device port? Can a single port belongs to two bridges? or would I need to create a subinterface first? Would I need a DHCP-relay? Am I expecting too much from my poor cheapie router? +------+ | CM | +--++--+ || +----WAN---------------+ | / \ Router | | BR1? BR0 | | | \ | | | {NAT} | | | / | | \ | +-P0----P1-P2-P3-Wifi--+ | +------+ |Device| +------+

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• How to access a port via OpenVpn only

  - by Andy M

  I've set up an openvpn server alongside an apache website that can only be accessed on port 8100 on the same machine. My /etc/openvpn/server.conf file looks like this: port 1194 proto tcp dev tun ca ./easy-rsa2/keys/ca.crt cert ./easy-rsa2/keys/server.crt key ./easy-rsa2/keys/server.key # This file should be kept secret dh ./easy-rsa2/keys/dh1024.pem # Diffie-Hellman parameter server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt # make sure clients can still connect to the internet push "redirect-gateway def1 bypass-dhcp" keepalive 10 120 comp-lzo persist-key persist-tun status openvpn-status.log verb 3 Now I tried to let only clients connected to the vpn network access the website on apache via port 8100. So I defined a few iptables rules: #!/bin/sh # My system IP/set ip address of server SERVER_IP="192.168.0.2" # Flushing all rules iptables -F iptables -X # Setting default filter policy iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP # Allow incoming access to port 8100 from OpenVPN 10.8.0.1 iptables -A INPUT -i tun0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o tun0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT # outgoing http iptables -A OUTPUT -o tun0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i tun0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT Now when I connect to the server from my client computer and try to access the website on 192.168.0.2:8100, my browser can't open it. Will I have to forward traffic from tun0 to eth0? Or is there anything else I'm missing?

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• Ubuntu 12.04 open port 80 inside WLAN

  - by Eduard

  I have an nginx server running on ubuntu 12.04 that serves http through port 80 and https through port 443. Everything works fine if I access it from the same computer via localhost, 127.0.0.1 or the local IP 192.168.0.11. If I try to access the server from another computer in the same VLAN it does not work for http; it works for https. I have changed my nginx configuration to also listen to port 8000 for http; I can then access http from the other computer in the same VLAN via "http://192.168.0.11:8000". I also have a web server running on port 80 on a windows machine and can access it from another device in the same VLAN, therefore the router is not blocking incoming http traffic. The nginx process is run by root. I have used tcpdump and I see that packets are arriving to Ubuntu: 192.168.0.16.49735 192.168.0.11.80 and that some response is being given 192.168.0.11.80 192.168.0.16.49735 (I do not know what the response is though). There is no request arriving at the nginx web server (I have checked the access log). I have iptables empty. I have unsuccessfully tried to find a solution for a long time to this, it has now become a matter of happiness or bitterness :).

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• Why do I have to specify virtual functions in the declaration of a derived class?

  - by neuviemeporte

  Given the base class A and the derived class B: class A { public: virtual void f(); } class B : public A { public: void g(); } I get errors saying that f() is not declared in B while trying do define void B::f(). Do I have to declare f() explicitly in B? I think that if the interface changes I shouldn't have to correct the declarations in every single class deriving from it. Is there no way for B to get all the virtual functions' declarations from A automatically?

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• What does opening a serial port do?

  - by reve_etrange

  What does opening the standard PC serial port do, in electrical terms (i.e. what voltages on which pins)? For example, the ancient VB6 program which controls an apparatus I am tasked with maintaining toggles .PortOpen to control some TTL. The connection only used 2 pins (bad solders fell apart), so which pins do I solder to? The only labels / documentation refer to pins 7 and 9, saying 0V and 5V parenthetically, but does .PortOpen really just put 5V between RI and RTS?. As a post script, this isn't the weirdest thing about the set up. The TTL I referred to above also connects to an instrument via a BNC to DB9 (!), with only 1 pin used. I guess there was an assumption about a common ground, since the BNC shielding isn't connected to the GND pin? The connection is to the instrument's 'foot pedal' pin, it was a way to remotely trigger the device. Update According to this page, the DTR and RTS pins can go high when the port is opened. If they were so configured, they will subsequently go low when the port is closed. If DTR and RTS are not enabled, opening the port should set both to low (and keep them low).

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• BIND having trouble resolving service.graphicly.com

  - by Keith Burgoyne

  Since about two weeks ago, we haven't been able to resolve service.graphicly.com: dig @192.168.0.12 service.graphicly.com ; <<>> DiG 9.3.4-P1 <<>> @192.168.0.12 service.graphicly.com ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached Digging on the name servers listed for graphicly.com shows that service.graphicly.com is a CNAME to takecomicsadmin.cloudapp.net. Digging on cloudapp.net's name servers seems to fail: dig @NS1.LIVEDNS.MSFT.NET takecomicsadmin.cloudapp.net ; <<>> DiG 9.3.4-P1 <<>> @NS1.LIVEDNS.MSFT.NET takecomicsadmin.cloudapp.net ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached Somehow, my home ISP's name servers can resolve service.graphicly.com without issue. Has anyone else noticed this problem? Does anyone know what the cause of this problem could be? Thanks!

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• SharePoint 2010 Development on Virtual Machine - Windows 7 or Server 2008?

  - by webworm

  I recently switched to a MacBook Pro for my development machine (for many reasons). I want to setup a Virtual Machine for ASP.NET, IIS, and Visual Studio 2010 development. I also have need to do some development work with SharePoint 2010. What I am wondering is if I should use Windows 7 (64 bit) or Windows Server 2008 (64 bit) as the OS for my development virtual machine. I don't really need most of the services running in Server 2008 so I felt that Windows 7 would probably run faster in the VM environment however I am fairly new to SharePoint 2010 so I am not sure if Windows 7 (64 bit) can be used as a development environment for it. Thanks for any input.

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• Why domain.com appears as theplant.com when hosted on hostgator?

  - by silow

  I have a script that's supposed to detect the url of its caller website. If the caller is another website, it should give something like http://callersite.com. I'm using this line of php code (though I suspect this won't matter for sysadmins) gethostbyaddr($_SERVER['REMOTE_ADDR']) I'm testing with a caller site that's hosted on hostgator. What I'm noticing though is that I don't get callersite.com, I get something like 1a.12.12ab.static.theplanet.com. I don't know what theplanet.com is and why I'm not getting caller site.com. Also what do I need to do to really get the domain of the site making a call to my script? -- Thanks for the explanation. Some have advised I use $_SERVER['HTTP_REFERER'] but it's not what I'm after. My script acts as an API. Another website makes a curl request to it and gets an output and later on presents it to the user. So http referrer gives false since the caller site.com is making a direct call to me. So any hope?

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