Does the server listen in the same port or on a random one....?

Hi all,
As I went through the Java Tutorial in Sun's website I found that though the server is assigned a port to listen, it does the actual communication with the client in another port and keeps the assigned port listening for other clients.
Can't we control this..?

The real number can even go upto 5000.Even 5000 is not alot. Whether you use NIO or blocking IO is going to make more of a differnece.
And we consider this because of some firewall restrictions (from my real client).That depends on how their firewalls are set. Unless they block HTTP and most other internet protocols (which I doubt) Then they only restrict the port the connection is opened on, not the port a open connection sends a packet to.

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You illustrator files may have different color profiles attached.
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Yours are quite far off for RGB (which are usually close to each other for many profile due to wide gamut). I question as Jacob did if one of your documents are in CMYK mode. Look in parenthesis after the document name at top of window.
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Is it possible to use both an ILB and an ELB (listening on the same port) in the same Azure cloud service?

I'm building a test Lync deployment on Azure; yes, I know this is not supported, hence "test".
Lync Front-End servers expose two set of web services, one for internal users and one for external ones; they listen on different ports (443 and 4443) on the same servers; when external services are published, you need a reverse proxy or a port forwarding
in order to map port 443 of a public IP address to port 4443 of the Front-End server(s). When you have multiple Front-End servers in a pool, you also need to load-balance them.
So, a typical Lync deployment looks like this:
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               |
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                  |
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        443         443
          |               |
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This should be easily replicated in Azure, as it supports both external load balancing and internal load balancing. They are even supported together in the same cloud service, so this configuration should be easy. However, it looks like "should"
is the keyword here.
After creating the external load balanced endpoint (which listens on external port 443 and forwards to port 4443 on the servers), I'm trying to create an internal load balancer and add internal endpoints to is; however, while the ILB can be created successfully,
adding an internal endpoint listening on port 443 and forwarding to port 443 on the servers fails miserably, with an error stating that port 443 is already in use by another endpoint:
Update-AzureVM : BadRequest : Port 443 is already in use by one of the endpoints in this deployment. Ensure that the port numbers are unique across endpoints within a deployment.
For reference, my commands are:
Add-AzureInternalLoadBalancer -InternalLoadBalancerName "LyncILB" -ServiceName "LyncFrontEnd" -SubnetName "LabSubnet" -StaticVNetIPAddress 192.168.0.20
(This completes successfully)
Get-AzureVM LYNCFE1 | Add-AzureEndpoint -Name "Https-Int" -Protocol "tcp" -LocalPort 443 -PublicPort 443 -LBSetName "HttpsIntLB" -DefaultProbe -InternalLoadBalancerName "LyncILB"
(This fails)
The existing external endpoint is configured as such:
Get-AzureVM LYNCFE1 | get-azureendpoint
LBSetName : HttpsExtLB
LocalPort : 4443
Name : HTTPS-Ext
Port : 443
Protocol : tcp
Vip :
ProbePath :
ProbePort : 4443
ProbeProtocol : tcp
ProbeIntervalInSeconds : 15
ProbeTimeoutInSeconds : 31
EnableDirectServerReturn : False
Acl : {}
InternalLoadBalancerName :
IdleTimeoutInMinutes :
LoadBalancerDistribution :
The error doesn't even make a lot of sense; the external load balancer listens on a public IP address, while the internal load balancer listens on a private IP address in the internal network; there
shouldn't be any conflict here... however it looks like there is one instead.
Why doesn't this work? Am I doing something wrong, or is Azure networking just being silly as usual again?

Hello Massimo Pascucci,
The issue that you are facing when creating an endpoint with internal loadbalancer is the limitation of not allowing same ports to be listening under a single cloud service. This reason for this is that there is a limitation of only one private IP (Also
known as the Internal load balanced IP) per cloud service.
There is also a limitation on the Internal load balancer more than one port to be published per load balancer:
You can leave your feedback by following the link below:
https://social.msdn.microsoft.com/Forums/en-US/1805c5a0-3906-4cd6-8561-9802d77e0ae5/is-it-possible-to-use-both-an-ilb-and-an-elb-listening-on-the-same-port-in-the-same-azure-cloud?forum=WAVirtualMachinesVirtualNetwork
Refer to this article for more information on Internal load balancer:
http://azure.microsoft.com/blog/2014/05/20/internal-load-balancing/
Thanks,
Syed Irfan Hussain

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HELP!!: Two server application instances could work in the same port?

Hi everybody!!!
i have two server application instances over the same JVM and both of them need to get requests from the same port, how can i get this??
I`m not interested on using RMI, and i wouldn`t like to use sockets, because i have already using XML-RPC, so if you can tell me how can i get this without using sockets nor RMI, please help me...
I don�t if there any way using threads??
thanks a lot,
JCPARRAM

Two sockets can't be bound to the same port on the same machine at the same time. This means that one application can't have two sockets listening on the same port and that two applications can't each have a socket listening on the same port (no matter what language they are written in, and, if they are in Java, no matter whether they are on the same JVM or not).
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Hi,
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I hope I am in the right form (it's the third one I am trying).
I have server/client application, one server that handles a lot of clients. In general when ever a client approach the server, the server create new process (fork()) that handle the client request.
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If it would help I can add the all code.
If you knows about articles that talked about this subject It might help too (I am talking about advantages and disadvantages of thread against process but regardless of sockets).

You might look at this article
http://httpd.apache.org/docs-2.1/misc/perf-tuning.html
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Q1:can I listens to the same port in differernt
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Q2:if I use two thread to listen to two different
port, you know, as the method for listening is a
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836981 wrote:
I want to make a file transfer application for multiple clients, there will not be a server that users will connect to, the application serves as client AND server, every client will have a serversocket object listen for new connections (it will receive a connection when someone wants to send a file to them)Read up on peer-to-peer.
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Reading the same port on the same machine

Hello,
i'm working on DatagramSocket to broadcast DatagramPacket (IP 192.168.xxx.255) and a fixed num port. The problem is that I can't have 2 threads that read (datagramSocket.read) on the same port, on the same machine.
How can I perform my tests ?
java.net.BindException: Address already in use
at java.net.PlainDatagramSocketImpl.bind(Native Method)
at java.net.DatagramSocket.bind(DatagramSocket.java:368)
at java.net.DatagramSocket.<init>(DatagramSocket.java:210)
at java.net.DatagramSocket.<init>(DatagramSocket.java:261)
at java.net.DatagramSocket.<init>(DatagramSocket.java:234)

Well, the short answer is that you can't.... at least I've never heard of a way how. Basically, when an application requests a port number, it basically owns that port number until it gives it up. You do this when you create the DatagramSocket. Each DatagramSocket is its own request, and therefore must have an unique identifying port. Otherwise, how would your operating system know who to give the data to when it receives a packet on your machine for port XXXX? Also, it would be a secuirity problem if other applications could listen on the same port as you use for other things like surfing the web, making online purchases, email.
However, what you could do is have one owner of the DatagramSocket... and share it among the other threads. When that owner receives a packet, it can notify the other threads it received a packet and pass the data to each one. Set it up something like how listeners work. Also, if you want it to span processes, you could use RMI or pass the data through other deined network connections between the processes.
Does that make sense? :)

Does the server listen in the same port or on a random one....?

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