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• Teaching logical/analytical thinking

  - by Joshua

  I have been trial running a club in which I teach programming for the past year and while they have progressed what they really lack is the most fundamental concept to programming, analytical thinking. As I now approach the second year of teaching to the children (aged 12 - 14) I am now realising that before I begin teaching them the syntax and how to actually program an app (or what they would rather, a game) I need to introduce them to analytical thinking first. I have already found Scratch and similar things such as Light-Bot and will most certainly be using the, to teach them how to implement their logical thinking but what I really need are some tips or articles on how to teach analytical thinking itself to children aged 12 - 14. What I'm looking for are some ideas on how to teach the kind of thinking that these kids will need in order to get them into programming, whether that be analytical, logical or critical. How and what should I teach them relating to the way their minds need to be wired when programming solutions to problems?

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• Reverse DNS does not match SMTP banner vs Reverse DNS mismatch

  - by MadBoy

  I have to make decision whether my Reverse DNS should match SMTP banner but Reverse DNS to DNS and vice versa stays different or vice versa. Which one to choose? I have an 2x Exchange 2010 server with one SMTP Sender with TMG 2010. TMG has 2 links connected so that we have 2 separate internet providers. The problem is I have no way to control TMG behavior on which link is used to send emails as it picks it randomly. I have 2 MX records: - mail.test.com which resolves to IP and IP resolves to mail.test.com - mail2.test.com which resolves to IP2 and IP2 resolves to mail.test.com This was done to prevent smtp banner issues but it provides problems with Reverse DNS if the server on the other side is eager enough to do comparison. But I've checked with Google and they also don't have that in perfect condition.

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• Limiting my heavy thinking to my job [closed]

  - by Robin Castlin

  This might be a weird problem which is only to a half relevant to actual programming, but hopefully there are people here that knows what I'm talking about. Basicly I'm proud of how I can deal with coding problems and fix them in short notice and many other aspects like building new systems and such. I'm fast on finding solutions and I often think about the impact my changes does to existing systems and so on, therefor preventing problem from arising at all and such. I am simply happy with how my mind operates when it comes to programming and I wouldn't want to change it at all. The problem, however is when I'm not programming. I find myself rather limited in social situations. I can't determine if it is through programming, but I sometimes think way to much about the consequences when it comes to being social. I know from own experience that most times you earn by not thinking about consequences, but it's hard for me not to. Often my friends tells me "I think too much" and even though I agree, I can't seem to change this behavior. My brain wants to think, and it likes to overthink simple stuff. Does anyone recognize the bad habit of not leaving advanced thinking at work, and in what way do you deal with it? If this isn't a suitable place to ask this question, I apologize and hope you may point me to the right site.

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• IPtables AWS EC2 NAT/Reverse NAT - For Reverse Proxy style setup but with IPtables

  - by Mark

  I was thinking initially needing to do a reverse proxy or something so I could get some SSL/TLS traffic look like it is being terminated at a server and IP address in the AWS cloud, and then that traffic is forwarded onto our actual web servers that aren't in the cloud... I've not done much iptables pre and post routing before Dnat or Snat which I know are the things I need or a combination of the things I need in order achieve what i'm trying. Things to note:- Client/User - Must not be able to see backend IP address and only see the IP address of the cloud box https (TLS/SSL) - connection shouldn't be terminated at the cloud box, it should act like a router almost EC2 instance - Has only one network interface available to play with... this is thus an (internet <- internet) type of routing going on. EC2 instance IP address is already more or less behind a NAT that I have no control over, for example... Public ip address could be 46.1.1.1 but instance IP will be 10.1.1.1. Connections from client will go to 46.1.1.1 which will end up at the instance and on interface 10.1.1.1. The connection from the client then needs to be forwarded (DNAT) onto the backend web servers which are back out on the internet (SNAT). Possibly a part of the problem could be that the SNAT will need to be set to the external interface of the instance and I wonder if this makes it harder for IPtables to track the connection? So looking to basically, have it look as though connections are terminating at this server and its IP address. Whereas all that's really happening is the https request and connection is being forwarded straight onto another internet facing web server. How possible does that sound?

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• Configure nginx to reverse proxy a single url, and issue 301 redirects to everything else

  - by Martin

  I am using nginx to issue redirects for a domain we are changing, but one of our old mobile apps becomes broken by this redirect when it issues one specific POST request to the old domain. Here is the current nginx configuration, how could I add a reverse proxy to perform a POST to the URL /post_url and redirect everything else the same as now? server { listen 80; server_name olddomain.com www.olddomain.com; rewrite ^(.*) http://www.newdomain.com$1 permanent; }

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• Software Reverse Engineering

  - by devang

  I am an Master's Student and i am learning Software Reverse Engineering. I am looking for softwares which can be legally reverse engineered. i looked on the net, but i am unable to find any..:( Do you any softwares which can be legally reverse engineered. I am not allowed to use Open source softwares.

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• Ranking drop after using reverse proxy for blog subdirectory and robots.txt for old blog subdomain

  - by user40387

  We have a 3Dcart store and a WordPress blog hosted on a separate server. Originally, we had a CNAME set up to point the blog to http://blog.example.com/. However, in our attempt to boost link-based and traffic-based authority on the main site, we've opted to do a reverse proxy to http://www.example.com/blog/. It’s been about two months since we finished the reverse proxy migration. It appears that everything is technically working as intended, including some robots and sitemap changes; the new URLs are even generating some traffic, as indicated on Google Analytics. While Google has been indexing the new URL locations, they’re ranking very poorly, even for non-competitive, long-tail keywords. Meanwhile, the old subdomain URLs are still ranking mostly as well as they used to (even though they aren’t showing meta titles and descriptions due to being blocked by robots.txt). Our working theory is that Google has an old index of the subdomain URLs, and is considering the new URLs to be duplicate content, since it’s being told not to crawl the subdomain and therefore can’t see the rel canonicals we have in place. To resolve this, we’ve updated the subdomain’s robot.txt to no longer block crawling and indexing. Theoretically, seeing the canonical tag on the subdomain pages will resolve any perceived duplicate content issues. In the meantime, we were wondering if anyone would have any other ideas. We are very concerned that we’ll be losing valuable traffic, as we’re entering our on season at the moment.

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• C# Sequence Diagramm Reverse Engineering Tool?

  - by Wayne

  It's essential for me to find a tool that will reverse engineer sequence diagrams by integrating with the debugger. I suppose using the profiler could work also but less desirable. It's a key requirement that the tool in question will record all threads of execution since the app, TickZoom, is heavily parallelized. We just evaluated a most awesome tool from Sparx called Enterprise Architect which integrates with the debugger. It allows you to set a break point, start recording method traces from that break point. It's a lovely design and GUI. Hope it works for you but it only records a single thread of execution so that makes it unusable for us. I will put in a feature request to Sparx. But hope to find a similar tool that does this now since that's the only features we need--not all the other stuff that Sparx also does rather well. Sincerely, Wayne

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• Sequence Diagram Reverse Engineering Tool?

  - by Wayne

  It's essential for me to find a tool that will reverse engineer sequence diagrams by integrating with the debugger. I suppose using the profiler could work also but less desirable. It's a key requirement that the tool in question will record all threads of execution since the app, TickZoom, is heavily parallelized. We just evaluated a most awesome tool from Sparx called Enterprise Architect which integrates with the debugger. It allows you to set a break point, start recording method traces from that break point. It's a lovely design and GUI. Hope it works for you but it only records a single thread of execution so that makes it unusable for us. I will put in a feature request to Sparx. But hope to find a similar tool that already does this since that's the only feature we need--not all the other amazing features that Sparx Enterprise Architect appears to do rather well.

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• Salaries in reverse engineering fields [closed]

  - by John

  I bumped into an old friend at a conference and he told me he was now a consultant doing reverse engineering. I don't have much knowledge of this particular area, but this person (that I can't manage to get in touch with now) just casually mentioned that he was earning big bucks. I was hoping someone at SO may know of the salary range that a skilled and experienced employee/freelancer may earn in this area? I can't find much information on the web - small area maybe? I dunno. Any help would be appreciated.

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• Creating reverse DNS entries which resolve [closed]

  - by Tiffany Walker

  Possible Duplicate: Reverse DNS - how to correctly configure for SMTP delivery I ran a DNS check and ended up with the following error: FAIL: Found reverse DNS entries which don't resolves IP-IP-IP-IP.HOST.DOMAIN.TLD ? ??? All IP's reverse DNS entries should resolve back to IP address (MX record's name -> IP -> IP Reverse -> IP). Many mail servers are configured to reject e-mails from IPs with inconsistent reverse DNS configuration. How do I properly configure and it so it goes to an IP?

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• Get IP network range after reverse DNS?

  - by Max

  For analytics purposes, I'm looking at large sets of IP addresses in server log files. I'm trying to perform reverse-DNS lookups to understand where traffic is coming from - e.g. what percentage of IPs resolve to corporations, schools, government, international etc. Despite a bunch of optimizations, individually reverse-DNS'ing every IP address still appears to be fairly expensive though. So - is there any way to obtain an entire range of IPs from a reverse-DNS? If yes, this could greatly reduce the number of actual reverse-DNS lookups. Example (numbers slightly obfuscated): Log file contains a request from an IP 128.151.162.17 Reverse DNS resolves to 11.142.152.128.in-addr.arpa 21599 IN PTR alamo.ceas.rochester.edu (So this is a visitor from Rochester University, rochester.edu) Now, would it be safe to assume that all at least all IPs from 128.151.162.* will also resolve to rochester.edu? What about 128.151.*.*? Is there a way to get the exact IP range?

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• reverse proxy only from one internal server

  - by hrost

  I have configured a reverse proxy and is working ok for one internal server, for example our mail server. Now, I like to know if it is possible to configure a reverse proxy for only one server /application (in this case our web intranet). Our problem is Intranet call another aplication inside same intranet server and another internal servers, and the only way that I know to publish this resources is make a reverse proxy in our dmz apache for all apllications servers, but I like that from our DMZ reverse apache only intranet will be called, and other applications will be called by intranet server, and not reverse proxy. I like to configure with this system for security reason, and only allow external access to one server. I have configured With Debian Squeeze and apache 2.2 It is possible? How?

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• How do I include the capistrano thinking sphinx tasks when using the gem

  - by Sam Saffron

  Im using the gem for thinking sphinx: sudo gem install freelancing-god-thinking-sphinx \ --source http://gems.github.com So: require 'vendor/plugins/thinking-sphinx/recipes/thinking_sphinx' Which is prescribed on the website does not work. How do I include the capistrano thinking sphinx tasks in my deploy.rb file when using the gem? EDIT Adding: require 'thinking_sphinx/deploy/capistrano' gives me: /usr/lib/ruby/gems/1.8/gems/freelancing-god-thinking-sphinx-1.1.12/lib/thinking_sphinx/deploy/capistrano.rb:1: undefined method `namespace' for main:Object (NoMethodError) from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require' from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.8/lib/capistrano/configuration/loading.rb:152:in `require'

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• Correct configuration of a reverse Proxy with IIS 6.0 and IIRF for Hudson

  - by Durden81

  I have an Hudson build working on IIS 6.0 with reverse proxy (IIRF). In general it works but 2 errors are displayed in Hudson in the main configuration page called "Manage Hudson" (only if I connect through the reverse proxy): Your container doesn't use UTF-8 to decode URLs. If you use non-ASCII characters as a job name etc, this will cause problems. See Containers and Tomcat i18n for more details. It appears that your reverse proxy set up is broken This is my configuration of IIRF: RewriteLog C:\logsIIRF.txt RewriteLogLevel 2 IterationLimit 10 MaxMatchCount 10 RewriteEngine ON StatusInquiry ON UrlDecoding 0FF # add a trailing slash: RedirectRule ^/hudson$ /hudson/ [I] # Does the reverse Proxy ProxyPass ^/hudson/(.*)$ http://localhost:8080/hudson/$1 [I] ProxyPassReverse /hudson http://localhost:8080/hudson Any suggestion on how to get rid of those errors?

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• Reverse Proxies and AJAX

  - by osij2is

  A client of ours is using IBM/Tivoli WebSEAL, a reverse-proxy server for some of their internal users. Our web application (ASP.NET 2.0) and is a fairly straightforward web/database application. Currently, our client users that are going through the WebSEAL proxy are having problems with a .NET 3rd party control. Users who are not going through the proxy have no issues. The 3rd party control is nothing more than an AJAX dynamic tree that on each click requests all the nodes for each leaf. Now our clients claim that once users click on a node in the control, the control itself freezes in such a way that they don't see anything populate. Users see "Loading..." message appear but no new activity there afterwards. They have to leave the page and go back to the original page in order to view the new nodes. I've never worked with a reverse proxy before so I have googled quite a bit on the subject even found an article on SF. IBM/Tivoli has mentioned this issue before but this is about all they mention at all. While the IBM doc is very helpful, all of our AJAX is from the 3rd party control. I've tried troubleshooting using Firebug but by not being behind the reverse proxy, I'm unable to truly replicate the problem. My question is: does anyone have experience with reverse proxies and issues with AJAX sites? How can I go about proving what the exact issue is? Currently we're negotiating remote access so assume for the greater part that I will have access to a machine that's using the WebSEAL proxy. P.S. I realize this question might teeter on the StackOverFlow/ServerFault jurisdictional debate, but I'm trying to investigate from the systems perspective. I have no experience with reverse proxies (and I'm unclear on the benefits) and little with forwarding proxies.

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• Configuring Apache reverse proxy

  - by Martin

  I have loadbalancer server and edges. I am trying to configure reverse proxy in order to hide the backend servers PL1,2,3. PL 1,2,3 are not located in same subnet. They are located in different locations. PL1 Lb1 -> PL2 PL3 I tried to configure Apache reverse proxy but it is not sending request to PL1,2,3. Reverse proxy worked only when I configured apache to send request to local server on other port. ProxyRequests Off <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPass /PL1 http://PL1server.com/ ProxyPassReverse /PL1 http://PL1server.com/ The above configuration did not worked. Could you help me to solve the issue. Or is there other proxy types like Squid,Socks5 to solve this issue. Does the reverse proxy fails if we use IP address or domain URL in ProxyPass and ProxyPassReverse ?

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• IIS Reverse Proxy support for multiple protocols

  - by Abraxas

  I have a server 2012 machine running IIS. It's in my DMZ and I would like to use it to do reverse proxy for several services. I can get it to route traffic on port 80 to 2 separate internal servers running web apps but there are some issues when I try to forward SSH (not port 80/443) and then when I try to forward OWA (Micrsoft exchange's 'webmail' services) to the internal mail server I run in to issues with guides (like this: http://blogs.technet.com/b/exchange/archive/2013/07/19/reverse-proxy-for-exchange-server-2013-using-iis-arr-part-1.aspx) when they say to have all traffic forwarded to the server farm created for OWA. My question for you all is this - given that there is no more Threat Management Gateway (only runs on server 2008) and ISA 2006 is also dead - is it possible to support multiple types of reverse proxies with different protocols (ftp, ssh, web, ssl-web) in IIS, or would it be better to install a different DMZ OS like a nginx server and use linux firewalls + nginx reverse proxy? Thanks for any help!

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• Django Class Views and Reverse Urls

  - by kalhartt

  I have a good many class based views that use reverse(name, args) to find urls and pass this to templates. However, the problem is class based views must be instantiated before urlpatterns can be defined. This means the class is instantiated while urlpatterns is empty leading to reverse throwing errors. I've been working around this by passing lambda: reverse(name, args) to my templates but surely there is a better solution. As a simple example the following fails with exception: ImproperlyConfigured at xxxx The included urlconf mysite.urls doesn't have any patterns in it mysite.urls from mysite.views import MyClassView urlpatterns = patterns('', url(r'^$' MyClassView.as_view(), name='home') ) views.py class MyClassView(View): def get(self, request): home_url = reverse('home') return render_to_response('home.html', {'home_url':home_url}, context_instance=RequestContext(request)) home.html <p><a href={{ home_url }}>Home</a></p> I'm currently working around the problem by forcing reverse to run on template rendering by changing views.py to class MyClassView(View): def get(self, request): home_url = lambda: reverse('home') return render_to_response('home.html', {'home_url':home_url}, context_instance=RequestContext(request)) and it works, but this is really ugly and surely there is a better way. So is there a way to use reverse in class based views but avoid the cyclic dependency of urlpatterns requiring view requiring reverse requiring urlpatterns...

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• Running a reverse proxy in front of Splunk 4.x

  - by sgerrand

  So, I have previously installed Splunk 3.x behind a reverse proxy and downloaded the latest version (4.0.6 at time of typing) expecting it to be as easy to use as before. Sadly this was not the case. There appears to be some elements which are not being translated correctly through the reverse proxy, causing Splunk to fail. I have used the following configuration in Apache2 to no avail: ServerName monitoringbox.com DocumentRoot /path/to/nowhere ProxyRequests off ProxyPass /splunk http://127.0.0.1:8000/splunk ProxyPassReverse /splunk http://127.0.0.1:8000/splunk Order allow,deny Allow from all Has anyone else had more luck than me in setting up Splunk 4.x behind a reverse proxy?

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• nginx reverse proxy hide redirects

  - by NZCoderGuy

  I've Nginx as a reverse proxy for two sites A and B running behind. The users go from public - reverse proxy - site A - site B (from A to B clicking links) What would be a typical configuration for a scenario like this? The url in the browser should be always the reverse proxy This is what I've so far but is not working worker_processes 2; error_log logs/error.log info; events { worker_connections 1024; } http { server { resolver 127.0.0.1; listen 8080; location / { set $target 'siteA'; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; rewrite ^(.*) $1 break; proxy_pass http://$target; } } }

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• Apache: Setting up a reverse proxy configuration with SSL with url rewriting

  - by user1172468

  There is a host: secure.foo.com that exposes a webservice using https I want to create a reverse proxy using Apache that maps a local http port on a server internal.bar.com to the https service exposed by secure.foo.com Since it a web service I need to map all urls so that a path: https://secure.foo.com/some/path/123 is accessible by going to: http://internal.bar.com/some/path/123 Thanks. I've gotten this far: <VirtualHost *:80> ServerName gnip.measr.com SSLProxyEngine On ProxyPass / https://internal.bar.com/ </VirtualHost> I think this is working except for the url rewriting. Some resources I've found on this are: Setting up a complex Apache reverse proxy Apache as reverse proxy for https server

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• Reverse Proxy Wordpress with Lighttpd

  - by Jonah

  I am deploying an application and a Wordpress installation on AWS. I have Wordpress set up under Apache on an EC2, and my application under Lighttpd, and I want to reverse-proxy Wordpress through the application node. This works fine, I just set up the reverse proxy in Lighttpd as so: $HTTP["url"] =~ "^/blog" { proxy.server = ( "/blog" => ( "blog" => ( "host" => "123.456.789.123", "port" => 80 )) ) } url.rewrite-once = ( "^(.*?)$" => "/index.php/$1" ) However, the issue is in the rewrite. When I enable rewriting, it catches it before the reverse proxy, and routes to index.php on the application server. I need it to not rewrite if it's going to the blog. I tried various regex matches and other configurations, but I haven't been able to get it to support rewriting and proxying at the same time. How can this be done?

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• UDP Reverse Proxy

  - by user180195

  I have found a way to make reverse-proxy to an external IP. Here is how someone making a request will see it's request being passed: Clients sends request Request reaches the Datacenter one in some place That datacenter, acting as a reverse proxy will redirect the same exact request to another datacenter. The datacenter will then process the request Although, this only works with TCP/HTTP (Looking currently at HaProxy). I am hosting game servers at the other datacenter (where the proxy is not) that are using UDP protocol. Do you know how can I setup a reverse proxy using the UDP protocol.

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• Reverse Proxy (mod_rewrite) and Rails (absolute paths)

  - by SooDesuNe

  I have front end rails app, that reverse proxies to any of a number of backend rails apps depending on URL, for example http://www.my_host.com/app_one reverse proxies to http://www.remote_host_running_app_one.com such that a URL like http://www.my_host.com/app_one/users will display the contents of http://www.remote_host_running_app_one.com/users I have a large, and ever expanding number of backends, so they can not be explicitly listed anywhere other than a database. This is no problem for mod_rewrite using a prg:/ rewrite map reverse proxy. The question is, the urls returned by rails helpers have the form /controller/action making them absolute to the root. This is a problem for the page served by mod_rewrite because links on the proxied page appear as absolute to the domain. i.e.: http://www.my_host.com/app_one/controller/action has links that end up looking like /controller/action/ when they need to look like /app_one/controller/action mod_proxy_html seems like the right idea, but it doesn't seem to be as dynamic as I would need, since the rules need to be hard coded into the config files. Is there a way to fix this server-side, so that the links will be routed correctly?

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