How to connect to two servers behind a firewall

Let's say I have a LAN with two independant servers, one at 192.168.2.10 and one at 192.168.2.20
As it is now, I can fwd the 548 port to one server and it works.
Is there a way i could connect to both servers, maybe having one and port 548 and one at 549, so if I connect using the default address, it will connect to server A and to the adress plus the port :549 it will connect to server B
I tried forwarding port 548 to one server and port 549 but for now, my router/firewall complains that I have a port conflict.
What's the simplest way to achieve what I would like.

Oh man, I think I've seen the answer to that in these treads, but it'd be around 20-30 pages back... iirc it would involve editing Hosts' or hppd file... BIG Help I know... but perhaps a real expert will be along shortly!

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Problem on connect to two servers with SSL

Hey all!
I've got a problem with connecting to two different servers via SSL in one Application. Every Connection works fine on its one via SSL.
But if i try to initialize a new connection it fails every time.
My thought is that the problem is the DriverManager. I'm not quite sure how this DriverManager works, but what i know is that it's a single-ton Class and with that maybe stores some parameters from the first connection which didn't get reloaded when trying to make a new connection.
Here's the way i create the connection ..
    String host="best.host.ever";
    int port="3306";
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    System.setProperty("javax.net.ssl.trustStorePassword", "trustpass");
    System.setProperty("javax.net.ssl.keyStore", keyStore);
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    System.setProperty("javax.net.debug","ssl");
    printDebug("[Konstruktor] : Connecting to "+MYSQL_URL);
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         Class.forName("org.gjt.mm.mysql.Driver").newInstance();
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        initOK=true;
    //Catch stuff following...Is it possible that the System.properties i'm setting are only readed one time by the DriverManager (if it's readed by the DriverManager at all)?
So when i initialize a new Object with different System.properties they may not get used again.
Hopefully somebody has an explanation or a solution for this.
Besides: If i launch the programm twice it's no problem to have to differen SSL connections at the same time.
Thanks for reading and in advance for trying to help!

Yep, it's the standard authentication failure message. (The error code is 1045).
The Exception which is thrown is a SQLException with the message:
Access denied for user 'username'@'p54BB743D.dip.t-dialin.net' (using password: YES)
errorcode: 1045
The code i'm using runs well with one connection and even with multiple connections as long as not more than one connection are using SSL.
To explain:
The user has the possibility to run the application with a user defined data-source (the connection). You can add a new connection and the application will then add a tabbed pane with the same gui but uses the other data source then.
This runs fine with multiple connections (I managed to work on 3 differen intranet servers and 2 different servers online, one of them using SSL)
So all together 5 Connections. Now i wanted to add a 6th server with SSL two and thats the point where it crashes. (Both SSL Servers run perfect on their own with my application - only both together doesnt work).
About that: Class.forName, yes i'm using it every time when i make a new Connection. This is wrong? Could you explain why?
Anyway thanks for your answers so far!
Message was edited by:
Hotkey_ger

How to connect the two field which have a diffrent length

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HI
I GOT THE SAME PROBLEM AT THAT TIME I DONE LIKE THIS
I THINK IT MAY HELPFULL FOR YOU
OBJID = 6 CHAR
SOBID = 40 CHAR
I GOT THE SAME ERROR WHAT YOU GET
I NEED ONLY 6 CHAT SO THAT WHY I HAD WROTE THIS LOGIC
1ST I HAD DECLARED THE SAME STRUCTURE TWICE
IN FIRST ONE IT IS NORMAL DECLARATION
IN SECOND ONE I HAD DECLARED THAT 2 FIELDS AS THE SAME LENGTH
I HAD PUT THAT IN THA BOLD LETTERS
AND AFTER THAT I HAD LOOPES THAT WORK AREA AND CONVERTED THAT SZE
REWARD IF USEFULL
TYPES : BEGIN OF ST_HRP1001,
 OTYPE TYPE HRP1001-OTYPE,
 OBJID TYPE HRP1001-OBJID,
 RELAT type hrp1001-RELAT,
 BEGDA TYPE HRP1001-BEGDA,
 ENDDA TYPE HRP1001-ENDDA,
 SCLAS TYPE HRP1001-SCLAS,
 SOBID TYPE HRP1001-SOBID,
 END OF ST_HRP1001.
TYPES : BEGIN OF ST_SOBID,
 OTYPE TYPE HRP1001-OTYPE,
 OBJID TYPE HRP1001-OBJID,
 RELAT type hrp1001-OBJID,
 BEGDA TYPE HRP1001-BEGDA,
 ENDDA TYPE HRP1001-ENDDA,
 SCLAS TYPE HRP1001-SCLAS,
 SOBID TYPE HRP1001-OBJID,
 END OF ST_SOBID.
SELECT OTYPE
 OBJID
 RELAT
 BEGDA
 ENDDA
 SCLAS
 SOBID FROM HRP1001 INTO TABLE IT_HRP1001
 WHERE OTYPE = 'D'
 AND OBJID IN S_OBJID
 AND BEGDA GE DATE-LOW
 AND ENDDA LE DATE-HIGH
 AND ( SCLAS = 'E' OR SCLAS = 'ET' ).
IF SY-SUBRC NE 0.
 MESSAGE 'NO RECORD FOUND FOR THE GIVEN SELECTION CRITERIA ' TYPE 'E'.
ENDIF.
LOOPING TO CONVERT THAT FIELD LENGHT
 LOOP AT IT_HRP1001 INTO WA_HRP1001.
 WA_SOBID-OTYPE = WA_HRP1001-OTYPE.
 WA_SOBID-OBJID = WA_HRP1001-OBJID.
 WA_SOBID-RELAT = WA_HRP1001-RELAT.
 WA_SOBID-BEGDA = WA_HRP1001-BEGDA.
 WA_SOBID-ENDDA = WA_HRP1001-ENDDA.
 WA_SOBID-SCLAS = WA_HRP1001-SCLAS.
 WA_SOBID-SOBID = WA_HRP1001-SOBID.
 APPEND WA_SOBID TO IT_SOBID.
ENDLOOP.
SELECT OTYPE
 OBJID
 AEDTM
 UNAME
 DELET
 CANCR
 NCONT
 FROM HRP1026
 INTO TABLE IT_HRP1026
 FOR ALL ENTRIES IN IT_SOBID
 WHERE OBJID = IT_SOBID-SOBID
 AND ( OTYPE = 'E' OR OTYPE = 'ET' )
 AND DELET = 'X' AND
 BEGDA GE DATE-LOW AND
 ENDDA LE DATE-HIGH.

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I installed VM workstation and created two virtual machine .Please suggest me how to connect them internally each other though vm network editor.I want create RAC Setup for practice.

NAT is the default adapter type in VirtualBox, which will work in almost any configuration and networking environment. Using the NAT adapter, the host system will establish connections on behalf of the guest OS. NAT requires that the corresponding VM guest adapter uses DHCP and cannot be used to provide any services unless you configure port forwarding (>1024) at the VirtualBox VM NAT adapter.
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VMware provides a Virtual Network Editor in VMware Workstation (KB 1018697), which allows to customize any of the existing virtual network adapter or add new ones. The available technologies under any Type 2 hypervisor are very similar between different products:
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I have a client server program and I was reading through my notes. I had jotted down a recommendation to put it behind a firewall. However, I do not know how to do this in Java at all or even where to begin. How do I even create a firewall in Java?
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However, I do not know
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How do I even create a firewall in Java? You don't.
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I would not know how to create a firewall for just this
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Hi Everyone,
For one of our customer remote sites i need to open some specific ports between the servers.
For this i need to config the ACL on firewalls.
Say Source is 192.168.50.x
Source is 172.16.10.x
Source is 172.30.50.x
Destination is 172.16.10.x
I do not know deatiled network topology at the remote site.
I know the servers default gateway and traffic from source server to to destination goes via few firewalls.
Need to confirm if i need to track which firewalls traffic flows from source to destination server best way is to remote in to server gateway and
do the sh ip route 172.16.10.x? and check the next hop device if it is firewall or not?
Also in some case source and destination server have same subnet so in this case i can assume no ACL is needed as they are behind same network?
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Mahesh

Mahesh,
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Hello !
I dont know if this is the right forum for this qusetion,
and maybe the question is really stupid, but ...
I made a little client/server application, just to
play around with sockets and serverSockets.
It works fine, but now i ask myself:
What happens, if there are two of my servers running on two
different computers in the SAME LAN behind the SAME
firewall/internetgateway, and both are listening on the SAME
port ?
F.e. if the extern IP of this LAN/(its gateway) is
204.556.234.123, and a client in the internet is connecting
to it on the port, on which the two servers behind the firewall
are listening, WHO'S ANSWERING ?
(If this port is set to "open and forward" in the firewall)
The one with the shorter patch-cable ? ;)
How is it possible for the client to differenciate
this two servers in that LAN?
The only logical solution i found is that this two servers
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Do i have to take care about situations like that in my
server-application ?
I have the feeling that i have to...somehow.
OK, you see i dont know much about this...
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greetings,
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F.e. if the extern IP of this LAN/(its gateway) is
204.556.234.123, and a client in the internet is
connecting
to it on the port, on which the two servers behind the
firewall
are listening, WHO'S ANSWERING ?
(If this port is set to "open and forward" in the
firewall)Whichever one the firewall is told to forward it to!
The two computers running your server have unique addresses on the internal network. The firewall will forward incoming connections to one of those addresses. Maybe it can do some simple "load balancing" by forwarding some connections to one server and some to the other, but still, any particular connection will only go to one server.

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I have had to reset both of my networks; one an AirPort Extreme and the other an AirPort Express. As it stands, the Extreme has a USB printer and a NAS drive connected to it, while the Express is my gateway to the internet. Right now I have to switch networks to either access the internet, or print.
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Thanks for any suggestions.
Ed

One option would be to configure both of your base stations in a Wireless Distribution System (WDS). In this type of configuration, you'll be able to both access the Internet and/or print without having to change wireless networks.

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Hi,
System 1 - PC, connected to the router+modem with ethernet cable, mostly has static IP
System 2 - Laptop, connected to the router+modem with wi-fi, mostly uses DHCP
I want to connect these 2 systems in order to access the shared data & printer of PC in Laptop.
I tried to do this by doing the following on my laptop.
start -> run -> \\<ip address of PC>
But I got the error that "Windows cannot connect to the \\<ip address of PC>". When I diagnosed it, it showed that "Your computer appears to be correctly configured, but the device or resource (<ip address of PC>) is not
responding".
How to connect now two systems?

Hi,
Please take a try with the following steps:
1. Restart the router;
2. Reconfigure TCP/IP settings, Navigate to :
Start/
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Networking and Internet/Change adapter settings/Local
Area Connection/Properties./Internet Protocol Version 6 (TCP/IPv6)/Properties
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Best regards
Michael Shao
TechNet Community Support

How to set up NAT for two servers using same port with ASDM ASA 5505

Hi there,
We have a new installation of a ASA 5505 and are trying to get some NAT issues straightened out. Here is the scenario: On our internal network, we have two servers running Filemaker Server, a relational database server that clients connect with using port 5003. Our goal is to be able to allow users from the outside to access either of these servers as needed. I know how to set up a simple static NAT rule and matching Access rule in ASDM which would be fine for a case in which only one server using a given port is running on a network, but for simple static rules I seem to be blocked from entering a different translated port number from the orginal port number, which becomes a problem when two servers we need to access from the outside are running software using the same port number.
What is the simplest way to address this need? I am guessing that I need to set up a scenario like this, where port 5004 (or any arbitrarily choosen unused port, can be used to access the second server:
Outside user enters FQDN:5004 and this translates to Database server # 1 as 192.168.1.40:5003
and
Outside user enters FQDN:5003 and this translates to Database server # 1 as 192.168.1.38:5003
If so, what is the easist way to get this done? Or is there a better what to handle this scenario?
Thanks in advance,
James

I would create two objects and use object NAT
object network Obj_5004
host 192.168.1.40
object network Obj_5004
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object network Obj_5003
host 192.168.1.38
object network Obj_5003
nat (inside,outside) static service tcp 5003 5003
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How to connect to two servers behind a firewall

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