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• Forward Request to Multiple Servers

  - by cactuarz

  We have 2 servers. One is old server and another is the new one. Currently we about doing a migration because the old server is not capable enough to handle everyday requests. The specs are: Old server Ubuntu 10.04 Nginx as Reverse Proxy Apache WSGI Python/Django New Server Ubuntu 10.04 Nginx Gunicorn Python/Django Celery+Redis Our manager asked us to research if the old server can perform multiple forwarding to all incoming request, for example, set Nginx of old server to forward all request to both old and new server. The purpose is to perform unit testing to new server using old server as comparer, see if the new server is ready to take over the role. Please help, if there is an idea, or must install some engine, or what we do is impossible. Many thanks.

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• 2 workstations won't connect to most websites, but will connect to some

  - by Dean

  I have a very frustrating issue I wasn't able to solve: 2 workstations which are used by the same user are not able to connect to most websites receivin a timeout, however they will load some websites specificly from my country. They are able to get the website addresses via DNS. Both stations have their internet connection through a remote router. Other stations in the same LAN are connecting fine. Here's what I tried: Virus scan Renewing IPs Reseting the workstations Moving one workstation to a different RJ-45 in the wall Reseting the hub and switch Checking the hosts file DNS flush Nothing seems to help. I am preparing a CD with more AV tools to see if there's anything hiding on the stations. UPDATE: It was an incorrect configuration in "Internet Options". I configured the correct proxy and now it works.

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• Wyse Simple Imager. Unable to Create Product Directory

  - by Steve

  I am trying to submit a post on www.technicalhelp.de, but I receive an error: Invalid Session. Please resubmit the form. This happens if I delete temporary internet files and log out and back in, and if I use a different browser, and if I use a proxy browser. Perhaps someone on this forum can help I am trying to push a Wyse device image to a USB thumb drive. The image is on a remote server, and the thumb drive is connected to my desktop PC. I am using Wyse Simple Imager to do this. When I select the following: Product: V90 Image Version: 5.010627.512 Image File: \servername\folder\OLD_Rapport\V90-withusb\9V90.i2d Almost instantly, without attempting any action, I receive the message: WyseImager Unable to Create Product Directory. Add Image Failed I have completely formatted the USB drive with FAT32. It is new out of the fox, and I can create folders in it. How do I fix this?

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• Restrict only some plugins to specific sites in Google Chrome

  - by Christian

  I am looking for a way to set up Google Chrome so that it will run a certain plug-in (Java, what else?) only on whitelisted sites, but other plug-ins (like the PDF viewer) everywhere. From playing with the policies available for Chrome, I think there are basically two levels of plug-in management: List of disabled plugins/enabled plugins: Controls whether a plug-in exists for the browser at all This pair of policies applies to plug-ins, but not to sites. Default plug-in settings/Allow plug-ins on sites: Controls on which sites plug-ins can run This set of policies applies to sites, but not to individual plugins, and it cannot override the first pair. There appears to be no way to configure Chrome so that some plug-ins only run on whitelisted sites, but others run everywhere by default. I have also looked at filtering content on the firewall/proxy level, but I'm not convinced it can be done securely there. Filtering by URLs (file names) or content types can be circumvented trivially, and identification by content inspection cannot be safe either.

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• Dynamic authentication realms in Apache

  - by Cogsy

  I have a front end server acting as a gateway proxy for many (a dynamic 'many') building monitors with embedded webservers. They are accessed with a URL like: http://www.example.com/monitor1/ http://www.example.com/monitor2/ ... I'm trying to restrict access to these monitors to only the users that own them. So what I need is a way of specifying rights to users or groups for specific directories. The standard auth mechanisms I see in Apache won't work because I need to specify every location. I'd prefer some dynamic map or script. Any suggestions?

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• Reasonably Secure Alternative to Poptop PPTP Server for Ubuntu server and Windows clients?

  - by wag2639

  I have a poptp server running on a old Fedora server but I'm upgrading to an Ubuntu 10.04 server. I was wondering if there are any good, reasonable secure alternatives to poptop that in can install on our new Ubuntu server as a way to get VPN access from Windows clients (XP and 7) to get remote access into our Intranet. We only use the VPN to access files located inside the network; we do not need to use it as a proxy/gateway. I've looked into openVPN but it seemed way too complicated and I would prefer something built into Windows. A Windows 7 only solution is OK.

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• IIS App Pool Identity Internet Settings

  - by Programming Hero

  How does an IIS App Pool determine its Internet Settings? I'm specifying a custom identity under which to host a .NET web application, a service account that is part of our Active Directory domain. When the application runs, it needs to make HTTP requests to other servers. This action causes it to read web and proxy settings from some location, but I can't understand where it goes for this information. Does it look: At the default account's settings on that box? At the default profile on the AD server? Its own local/roaming profile? A combination of the above? Somewhere completely different?

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• Is Apache ReverseProxy to Passenger Standalone an acceptable production deployment?

  - by davetron5000

  I have the need to deploy Rails 3 apps, using RVM and gemsets, and am expecting “public” traffic (i.e. this is not an internal-only app). I also must use Apache as the public interface to my app. I understand that Passenger Standalone can help accomplish the rails/RVM end, and I have successfully set it up in my development environment. My question is how viable this setup is for a production deployment. Is deploying via Apache configured to ReverseProxy to my passenger-powered Rails app going to create problems? Since I'm designing the production deployment now, I want to understand if I should spend the additional time to set up Passenger connected to Apache and have that Passenger communicate with Passenger Standalone instance running my Rails app. So, I'm looking for one of I guess three answers: Apache Reverse Proxy to Passenger Standalone will be generally fine You should not use the Apache/Passenger Standalone configuration, but set up Passenger on the Apache side as well Your entire setup is just Wrong, please RTFM (and include link to "FM")

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• Squid3 not working. Access denied.

  - by Nitish

  I installed SQUID3 on a Linux machine with two ethernet interfaces (eth0 and eth1). I used the default settings in the squid.conf file and uncommented the two lines acl localnet src 192.168.0.0/16 and http_access allow localnet. eth0 is connected to a router, which provides Internet access. It is assigned an IP 192.168.1.2 by the router. I manually configured eth1 to have an IP address 192.168.5.1. It is connected to a switch. Systems having IP addresses 192.168.5.x are connected to this switch. I ran these two commands for NAT: iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.5.1:3128 iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 But when I try to access internet from a system having IP 192.168.5.2 through the proxy I get an error that says "Access denied". What is wrong with my configuration?

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• SSH Tunnel doesn't work in China

  - by Martin

  Last year I was working in China for a few months. I never bothered setting up a real VPN, but just created a SSH tunnel, and changed my browsers proxy settings to connect through it. Everything worked great (except flash of course) but that was fine. However, now I'm back in China but I'm having problems with this approach. I do the same thing as last time, and according to https://ipcheckit.com/ my IP address is indeed the IP of my (private) server in the US, and I'm logging in to my server using a fingerprint I created long before going to China so no MITM should be possible. Furthermore the certificate from ipcheckit.com is from GeoTrust - so everything should be OK However, I still can't access sites which are blocked in China. Any idea how this could be possible?

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• How failover should work in IIS cluster with Application Request Routing?

  - by username

  I have set up several servers with IIS and connected them to the load balancer - server with installed IIS Application Request Routing. I have created a server farm and added two servers. Then I stopped IIS on the first server and tried to open my web site. It returned me an error: 502 - Web server received an invalid response while acting as a gateway or proxy server. But if instead of stopping IIS I shut down the first server, I'm getting a response from the next server which is online. The question is, what the expected behaviour should be for failover with ARR, should it switch me to the next server if IIS is stopped and server is online?

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• Problem with the hosts file under windows 7

  - by martani_net

  I updated some entries in the hosts file "C:\WINDOWS\System32\drivers\etc" to make google for example point to 127.0.0.1 # Additionally, comments (such as these) may be inserted on individual # lines or following the machine name denoted by a '#' symbol. # # For example: # # 102.54.94.97 rhino.acme.com # source server # 38.25.63.10 x.acme.com # x client host 127.0.0.1 localhost ::1 localhost 127.0.0.1 google.com This works fine under windows Vista, but not under Widows 7. When I type google, it goes directly to Google's website. For info, I am not using a proxy server. I think there are some temporary DNS settings that must be flushed, but I don't know how, anyone knows how to fix this? Thank you.

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• close ssh sessions

  - by egor7

  I'm using ~/.ssh/config for logging to the internal.local corporate server: Host internal.local ProxyCommand ssh -e none corporate.proxy nc %h %p But after closing session (typing exit), my sshd session on server stays still active (I see it through different connection). Hot do I close session or change my config in the appropriate way, to eleminate hang sessions? First check from the second, root session: ps -fu user_name user_name 861 855 0 16:58:16 pts/3 0:00 -bash user_name 855 854 0 16:58:13 ? 0:00 /usr/lib/ssh/sshd After logging out: user_name 855 854 0 16:58:13 ? 0:00 /usr/lib/ssh/sshd Just after scp files to/from the internal.local a new scp sessions still hangs on the server.

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• Ubuntu 9.10 Dowload Speed Very Slow

  - by Don

  I'm running Ubuntu 9.10 desktop and I'm new to the Linux world, so bear with me. I'm on a corporate network of 3 T1s shared across 50-60 users. I typically get about 300 KB/sec for downloads, but for whatever reason, the Linux box will start out in that range, then drop to less than 1KB/Sec sometimes. Doesn't seen to matter where I'm downloading from. Right now I'm trying to get Eclipse for PHP and it's running at 3-6KB/sec. Getting the updates for the system will also drop to very slow rates. Our IT person has set up the machine to get the same 10.0.0.x address when it starts, and moved this IP to bypass our Proxy/Firewall going out, so that shouldn't be the issue. Can anyone recommend something I can try to better diagnose the problem. Again, I'm new to the Linux world and the hardware/OS setup side in general (coming form more of a coding background). Thanks for any advice.

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• Serving a default image with nginx

  - by ustun

  I have the following configuration in nginx: location /static/ { root /srv/kose/; expires 2w; access_log off; } location / { proxy_pass http://127.0.0.1:8089; } If a file is not found in /static/, I want to serve a default image, and not proxy_pass to 8089. Currently, it looks for the file in the root for static, if it cannot find it, it tries the proxy. I have tried the following, but it doesn't work. How can I tell nginx to serve the default image? I have also tried try_files to no avail. location /static/ { root /srv/kose/; expires 2w; access_log off; error_page 404 /srv/static/defaultimage.jpg; } location / { proxy_pass http://127.0.0.1:8089; }

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• debian installation without internet connection

  - by Gobliins

  Hi i want to install some Debian distributions (Grip, Crush, Lenny...) for arm / armel architectures. www.emdebian.org/ i refer to this guide www.aurel32.net/info/debian_arm_qemu.php The Problem i have is that i dont have internet connection with My Linux VM or Qemu i am behind a Proxy. I want to know is there a way where i can dl all the needed files and save them to disk that i don´t need an i.c. during the installation? I am working under Windows now. my regards

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• Gmail/Facebook/Hotmail not opening in Firefox/IE on Windows 7 Home

  - by singlepoint

  Hi, I am unable to open Gmail/Facebook/Hotmail on Firefox/IE on Widows 7 Home. I just unboxed a brand new hp laptop with Norton Security Suite running inside. I get following error message on Firefox. Please help. The connection has timed out The server at www.google.com is taking too long to respond. * The site could be temporarily unavailable or too busy. Try again in a few moments. * If you are unable to load any pages, check your computer's network connection. * If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web

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• Cannot access internal website after being connected to other network

  - by Dandroid

  I have a client who claim they cannot access their internal website when they have e.g. been out traveling. They have to reset their browser settings every time to be able to get access again. As they live on another continent and timezone it's hard for me to run live tests with them to see what changes in their browser settings. My first guess would be it's some sort of Proxy related issue, but I want to know if there could be other reasons for this? It's not the LAN itself, that we are sure of. It's browser specific only. Edit It's worth mentioning that it only happens when they turn off/restart their computers.

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• Fully secured gateway web sites

  - by SeaShore

  Hello, Are there any web sites that serve as gateways for fully encrypted communication? I mean sites with which I can open a secured session, and then to exchange through them with other sites in a secure way both URLs and content? Thanks in advance. UPDATE Sorry for not being clear. I was wondering if there was a way to access any site over the Internet (http or https) without letting any Intranet-proxy read the requested URL or the received content. My question is whether such a site exists, e.g.: I am connected to that site via https, I send it a URL in a secured way, the site gets the content from the target site (possibly in a non-secured way) and returns to me the requested content in a secured way.

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• Nginx return 444 depending on upstream response code

  - by Mark

  I have nginx setup to pass to an upstream using proxy pass. The upstream is written to return a 502 http response on certain requests, rather then returning the 502 with all the header I would like nginx to recoginse this and return 444 so nothing is returned. Is this possible? I also tried to return 444 on any 50x error but it doesn't work either. location / { return 444; } location ^~ /service/v1/ { proxy_pass http://127.0.0.1:3333; proxy_next_upstream error timeout http_502; error_page 500 502 503 504 /50x.html; } location = /50x.html { return 444; } error_page 404 /404.html; location = /404.html { return 444; }

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• Disable address bar in Internet Explorer 9

  - by token

  I'm trying to disable the address bar in IE9. I've done a significant amount of searching on this and just can't seem to find a way to make it happen. A lot of web resources discuss how to do it in IE8, but not IE9. The reason you might ask? I have an application being hosted in a remote desktop farm that links to web pages outside of the application into Internet Explorer. I need to ensure users are limited to just going to the pages the program pushes them to. I realize I could use a proxy server to limit where they can go, but I'm trying to find a really simple way to just disable the address bar instead. I can't use Kiosk mode because it puts the browser into full screen mode. This won't work for my situation as I need to give users what appears to be a regular browsing experience without an address bar.

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• Run command on init and restart on errors

  - by chersanya

  I have internet access on my PC through proxy through SSH, so every time I need to execute ssh -L PORT:SERVER:PORT LOGIN@SERVER and then type a password. After each network failure or reconnect this command has to be executed again. I've got bored of it and look for a way to do this automatically: first run this after boot (it doesn't seem to be a problem - put this command in some init file and that's all) and then rerun it (if possible, then type password) on each network failure. Is it possible, and how? OS Linux (Debian)

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• How can I access my desktop computer from my Android phone?

  - by Qurben

  Is it possible to access a computer connected to the internet through an Android phone? (the internet goes through the phone by tethering) I want to use ssh to connect to the computer (from a different computer in the same network), but I am not able to access the computer. Is it possible to portforward, use some kind of transparent proxy or to use DMZ? My phone is rooted and I have Cyanogenmod installed and I can use iptables. EDIT: The changed title completely changed the question! My setup is the following: I have an android phone connected to a computer through the usb cable tethering internet from the phone, I wanted to ssh into the computer behind the android phone from another computer in the same network as the android phone. This was not possible, because the android phone creates a separate network for the connected computer, effectively shielding it from any incoming signals. It turned out to be quite simple to fix by just using iptables.

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• uploading files greater than 1MB = connection resets

  - by Legit

  I'm using nginx on the frontend as "proxy cache" and apache on the backend, i've set my PHP settings to the following: error_log = /var/www/site1/php_error.log error_reporting = 22527 file_uploads = On log_errors = On max_execution_time = 0 max_file_uploads = 20 max_input_time = -1 memory_limit = 512M post_max_size = 0 upload_max_filesize = 1000M What's the problem? Uploading files less than 1MB is successful but anything greater than that, Google Chrome outputs: Error 101 (net::ERR_CONNECTION_RESET): The connection was reset. I already checked for the error log file but it doesn't exist in the directory. I also checked /var/log/httpd/error_log but no uploading related problems. I don't know anything else which might have caused the problem so I have reached out for your helping hand. Thanks!

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• 1K incoming http post requests per second, each with a 10-50K file

  - by Blankman

  I'm trying to figure out what kind of server setup I will need to support: 1K http post requests per second each post will contain a xml file between 5-50K (average of 25 kilobytes) Even if I get a 100 Mb/s connection with my dedicated box (they usually give 10 Mb/s but you can upgrade), from my calculations that is about 12K kb/s which means about 480 25kb files per second. So this means I need around 3 servers then, each with 100 Mb/s connection. Would a single server running HAProxy be able to redirect the requests to other servers or does this mean I need to get something else that can handle more than 100 Mb/s to proxy things out to the other servers? If my math is off I'd appreciate any corrections you may have.

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