I built 2 apps based on meteor for big clients - MAN and BMW Denmark. Unfortunately both can't see apps (just white screen in browsers) from own internal networks. I able to see it, my partners able to see it, issue somehow happened only from their[bmw and man] networks. I think somehow it's related to their firewalls or any kind of security settings/services, but it's impossible to get any info from their tech. department. What kind of issues could be the reason of this scenario? I'm 100% sure it's related to meteor only, 'coz old-school solutions (Django-based) works fine from same domain. And it's not related to exact apps 'coz 'em works on any another browser outside of corporate networks.
If it's not the port as suggested, the IT group may have restrictions in place, like an aggressive web filter or strict site whitelisting. Speaking from my team's experience inside a large corporation, we even have trouble building our apps behind the firewall because of the package checks with every server refresh. We get the same thing with NPM and bower.
What do see happening if you run Fiddler? Blank screens can be due to a bad request.
We had a situation similar to yours and the issue was related to the F5 load balancing appliance stripping HTTP headers and the corporate network using a proxy server. The header we lost was the X-Forwaded-for causing issues when going through the corporate proxy server. We had to troubleshoot with their IT to resolve it.
Compare the Fiddler trace from outside the corporate network with one from within the corporate network.
If it works outside the corporate network, the issue is probably something like I'm describing above.
It's most likely defaulting the websocket port to something other than 80/443. A lot of corporate firewalls block traffic on ports other than 80 & 443.
Related
I have an ASP.NET web application that has been hosted in IIS local Machine.
My Question is :
Is there any free or paid method that allows browsing this web
application from the internet as Host Server ?
Thanks
The easiest way to to publish it directly onto the internet. You do run the risk of attackers then being able to attach your machine, so you will need to brush up on your security skills. It might be worth looking into one of the free hosting options from AWS, Azure or Google Cloud.
To use your local machine as a web server, first, configure it to use a static IP. Its been a while since I've done it on windows, but this looks about right http://www.howtogeek.com/howto/19249/how-to-assign-a-static-ip-address-in-xp-vista-or-windows-7/.
Next you will need to configure port forwarding on your model. You want to send all traffic on port 80 to your machine, using its new fixed IP address. If your using HTTPS as well, configure port 443 to go to your machine. There are too many different modem brands, all of which handle this slightly differently, to consider offering any more help on this. You will need to do some reading up on your particular modem for step-by-step instructions.
If your internet connection is using a fixed IP, then you can stop here.
If not, or if you just want a domain name, then its worth signing up for a dynamic dns service. I use No-ip, its free, it integrates with my modem and I haven't had any problems with it in the last few years. Once this is in place, you will be able to hit your webserver just like a real one. Using something like "http://mypc.no-ip.biz/mydemoapp/
But again, be warned about exposing your machine on the internet. There are nasty people out there who love to hijack other peoples computers.
Update:
This should give you some guidance on port forwarding
http://www.howtogeek.com/66214/how-to-forward-ports-on-your-router/
Try http://www.noip.com I just logged in and it seemed happy. Otherwise, have a click through all the settings in your modem looking for ddns or dynamic DNS. There is usually a drop down of all the providers that it will talk to. And some providers have apps that you run on your PC , which is easier that working with the modem for some. (Or for models that don't support ddns.)
My college has different proxies for accessing Internet like 192.168.0.2/3/4 and also a specific port number.What is the advantage of using this ? I also would like to know what exactly happens there.I also heard that my institution has different ISP connections shared over the same network. What is the role of proxy there?
It will be very easy to know if you understand what proxies do and why they are used generally. Which could be found on a magical website called www.google.com. By using a proxy, you get more control over the network because all request go through there.Your school may want to do stuffs like traffic shaping, content filtering etc. Using the proxy server will make sure all request to the internet are routed there first.
Proxies are good for a few things:
Filtering. By using a proxy, your college can filter out viruses, porn, Facebook or torrent downloads.
Logging. By requiring a username and password, the college can track what you do with your internet time, and can tell you off if you go somewhere you shouldn't or help you be allowing them to do traffic shaping, or other network maintenance.
Line Bonding. For example, if you have two ADSL lines of 5Mb, you can bond those to get a 10Mb line (normally this is done at the gateway stage, and not the proxy, but it is possible to do it at this stage of the network)
Failover. Again, this would normally be done at the gateway/router stage. This detects which lines are active and routes your traffic to those lines.
Network Connectivity. If your college is in-turn part of a bigger academic network, this could allow crossing those network boundaries to get internet access.
Although those are valid possibilities, it's probably just for Filtering...
In the wider internet, proxies are in use for allowing access to blocked content - like giving China access to Google...
I need my app to be able access an third party API who limits access based on a single, static IP Address.
Due to the dynamic nature of the Heroku dynos and routing mesh, this is not possible - I'll need something with a fixed IP Address to act as a proxy.
An US East EC2 Linux/Nginx instance would seem the sensible choice, but these seems like a lot of work/maintenance for something pretty trivial. Does anyone know of any services out there that do this?
Ok so after a bit of research I've discovered the best way to do this currently is indeed with an AWS US East EC2 instance running some sort of proxy. I've gone with linux/nginx.
I've also learned there is a Heroku add-on currently in alpha stage of development that will handle exactly this requirement. If you'd like to test it, get in touch with Heroku support.
You can also use the Proximo add-on to get a static outbound IP address via proxy without any of the maintenance headaches.
I have 50 machines in a LAN and each of these have internet access. Can a program be developed using vc++ which will tell what are all the websites which is being opened by users in each machine?
You can easily accomplish this by writing an application which captures packets outbound on port 80 (and the associated DNS information). The problem is that this application must run on every client computer which you want to trace. The easier method, as stated by others, is to take advantage of your network architecture and tunnel all traffic through a central proxy which can record the same information.
There are many-many enterprise tools suited for just this task in the latter instance.
Route your internet traffic through a centralized proxy and monitor the traffic from proxy say using Fiddler, or something else. In case proxying is not possible, use Fiddler to generate data at known location and then collate it at required intervals.
Install a firewall, if you don't already have one, and use it to log connections.
I'm wondering if anyone knows how this happens? My website is down, but every computer on my internet connection/router can see it. I've cleared my cache etc, but another computer in the house shouldn't be seeing a site that's offline. How weird?
It's hosted remotely, not on my network or anything.
The first question to ask yourself is, how certain are you that it's down? If computer A can access it and computer B cannot, either one could be "right":
The site could be down, and computer A could be looking at a cached version from the ISP.
The site could be up, but computer B could be having general internet connectivity problems, or problems accessing this site in particular (bad DNS cache, etc.)
One way to tell is to add some new content to the site (via FTP or an in-place content management system like wordpress, for example) and see if the computer that can access it (computer A) can see the changes. If so, then you're looking at a "live" site, where the pages are being served directly from the server. (If the server is active and runs web software like PHP or ASP, then that would be another way to "prove" that the site is up and running).
Do you know the IP address of your web server?
Do you have direct access to the Internet on port 80?
Tell if your server is up or down by doing the following
telnet 255.255.255.255 80
Where 255.255.255.255 is your web server's IP address. On windows the screen will go blank if the server answers. Then type
GET / HTTP/1.0
And hit enter twice. You should see the content of your default page. If your running as a virtual host, you'll probably need to use HTTP/1.1 and the Hostname tag.
GET / HTTP/1.1
Host: www.yourservername.com
There is one return after HTTP/1.1 and two returns after your hostname. If you get content (the correct content) back from your web server it is definitely not down. If the server fails to connect then your web server is really down, and the content your computers are seeing could be any of the following:
local page cache
local proxy server
ISP proxy server
local ARP poisoning attack redirecting you to attacker's local web server which mirrored your site.
DNS poisoning to direct your browsers to someone else's web server which mirrored your site.
If your site is up, but geographically separated folks can't see your site, it is most likely a DNS issue or an ISP level routing issue.
A good tool to check for DNS issues is OpenDNS's CacheCheck. As for the routing issue, the best bet is to call your web hosting company and see if they've had any other complaints from their other customers, or if they are currently working on a routing issue.
Internet provider cache maybe.
What DNS servers are your friends using? Same as yours?
Your ISP is probably caching the content.
i know it's down cause i asked my friends in other locations to look at it. then i ran a test using this site i found.
http://www.websitepulse.com/help/tools.php
i'm switching hosts and we're dealing with my main domain name. that's the other reason i expected this interuption. i just want to know when it's finally switched.
is ISP cache a bad thing?