I have been asked to take over a project where the previous developer had used socketio4net,
hence I learnt of the socketio4 project only now.
the problem my employer is facing is clients having proxy servers.
we have installed our product(client side) on clinics which uses socketio4net and websocket.
They all connect to our main azure server for sending data. In clinics without proxy,we are not facing any issues. but those with proxy server, our service is not even starting.
if we have to implement the ssl process, it will be a big overhead for us
how do we achieve ssl and proxy settings for sockets in general? does socketio4net provide any other options?
do I have change to http classes like webclient?
In my experience with proxies and school's in particular, the vast majority turned out to be a firewall based issue.
What port are you using, 80, 443 or something else? If that is the issue, the clinics would need to either whitelist your server ip, or allow the ip:port combo you've set.
For a quick test at the clinics that have issues - I would try these two sites (probably others sites you can find too):
http://websocketstest.com/ - tests for ports 80, 8080, 443 with and without ssl - do all or only some work?
(this site is also great for a end-user at the site to run for you, as you can get a results link - double bonus points!)
http://www.websocket.org/echo.html
Are both of the sites above able to connect?
Hope that helps...
Related
at my firm we have a jupyterhub/lab installed and is used by roughly 70-100 people in a secure network that can only be accessed to from work. Recently the idea of hosting web-applications for short time use came up, but we are having port problems. User A is running a web application on port 5000, and User B can’t use the port because it is already in use. Port 5000 is default, it can be changed but this is not the behavior we want. Does anyone know of a way for web-applications to run on the same port in the same environment? Have looked into server-proxy but i do not really understand it. Is the way to achieve this really to be running a vm for each user securing that the port is not in use?
Any help is appreciated
I have developed Yii2 CRUD application using models, controllers and views. It is used locally on PC. I wanted the users to use it online.
For eg. I have www.example.com and I wanted to make this yii2 CRUD application available on this site. What are the steps?
Your question is not very specific, therefore you haven't received an answer. I'm assuming you are asking about how to use your local PC as the server for an online site. Otherwise please clarify your question.
You will need to do the following steps:
Point the domain name to the public IP address behind which your local PC is sitting. You can find that by going here: http://whatismyipaddress.com/
In your router you need to set up port forwarding (NAT rules) for port 80 (or 443 if using https) to your computer's local IP address.
Depending on your Apache configuration (or whatever webserver you are using) you need to ensure it serves the right website. This is too broad a subject that I can give you any details here.
Note that you are now opening up your local computer to the Internet and hence you should be aware of the security implications it has.
I am writing an application with C++ to connect to my server.
I am using gethostbyname(). It is working fine when I give host name as 'localhost'. but if i try any other site like google.com, it fails.
Can anyone please tell me what could be going wrong.
I can access those websites through browser. Note: I have proxy set up in my browser.
Is thr proxy causing issue with gethostbyname()? if yes, how can I mention proxy in my C++ code?
Based on what you describe in your question, it appears that your machine is on a corporate network that is firewalled off the Internet, all access to the web is via a web proxy, and that your network does not have Internet DNS resolution.
Even if you managed to succeed in resolving an IP address, you will not be able to make an outbound connection, unless your firewall offers a Socks proxy, or an equivalent.
If your intent is to write a client that accesses web sites via HTTP, you will need to use your corporate HTTP proxy to do that. Contact your system administrator for more information.
Im just wondering, can 2 or more different external hostname/DNS redirect to multiple local servers but same port?
Let's see, I have 2 DNS internet domain for an example, myserver1.com and myserver2.com, and both I have same A record to my forwarded server IP (e.g: 102.123.123.123). Under my server which only has 102.123.123.123 IP address has 2 application servers but instead of trying to make they work, I use different port for each server applications for an example, serverApp1 listening to 0.0.0.0:2010, serverApp2 listening to 0.0.0.0:2020
My point is, is there any way or how to forward my myserver1.com:2000 to serverApp1 (port 2010), and myserver2.com:2000 to serverApp2 (port 2020) but both myserver1.com and myserver2.com has a same A record?
Im quite sure either it is in iptables or /etc/hosts or BIND issues, but guide me if I missed something. And by the way, the servers and DNS records are accessible from the internet which is the firewalls are configured properly. Thanks.
I don't have much experience in that, but I think you will need a third server/firewall/proxy listening for the incoming host and route it accordingly.
Again, I don't have much experience in that, so I'm not sure if the firewall is able to do that.
I think you can use redirection servers like apache.
In my application we want to access lot of intranet servers from internet. So what we did, we configured a apache with all the mappings in httpd.
So when ever a request to apache comes, it will be redirected appropriately.
For example - I have two servers or hostname in intranet : 1) abc.com:7300/context1
2) xyz.com:8900/context2
We configured a apache with host name abcxyz.com:9000. When a request like
abcxyz.com:9000/context1 comes it will be redirected to abc.com:7300/context1 and when a request like abcxyz.com:9000/context2 comes it will be redirected to xyz.com:8900/context2.
In your case since the requests are going through the single server (102.123.123.123), you can use redirection.
Hope it helps.
I have an iPhone app which relies on connecting via the local network to a server running on a user's mac/pc.
The server is running an http service on port 8080
I already add exceptions to the default windows firewall, or the default mac firewall to ensure traffic is allowed to reach my app.
However the most common customer issue is that the iPhone can't communicate with the server.
Normally this is the network router blocking traffic - though sometimes the user is running their own firewall which blocks the traffic.
Is there a protocol which will let me say something to the effect of
'will all the firewalls on this network, please allow communication to <an ip> on <a port> if the traffic originates within this network?'
I have looked into upnp - but that seems to concentrate on opening a port to the outside world which I don't want to do.
suggestions?
thanks in advance.
No, there is no such way or protocol aside from UPnP. And I wouldn't recommend it anyway because in company networks it would cause all sorts of problems and security issues if this were possible.
I'd suggest that you set up a FAQ entry or installation section for your software where you describe this common issue and give details to the customers how they can detect and solve this problem.
In general, higher ports (above 8000 or 16000) are not blocked or firewalled. I would seriously consider allocating a random port in that range.
Also, consider to advertise your service with Bonjour. Using Bonjour has the nice side-effect that your iPhone app does not have to know the port number. It can simply browse the network for available servers. If there is just one then connect to that, otherwise present the user with a list to choose.
Is there any way to run the server on port 80? You're likely to encounter fewer issues on a standard port.