Re: remoting not working through vpn
- From: Roy Chastain <roy@xxxxxxxxx>
- Date: Fri, 19 Aug 2005 08:02:39 -0400
Am I to assume that you have created a two way channel and that you are actually referring to events that are being sent back from
the server to the client?
If so, then read on. If no, you may want to read my ramblings anyway.
1) - VPN connections. These can act differently depending on where the VPN terminates.
For instance, I have ISA firewall and all my VPN connections terminate on the firewall system. They are then routed or NAT'd as
appropriate to other networks that the firewall connects to. This could include another VPN to a site to site network. Once the
data makes it (I will use INTO instead of THROUGH) the firewall, it is subject to firewall routing and NAT't rules.
The other case might be that you have tunneled the VPN completely through the firewall and let it terminate on the server itself.
In this case the firewall has NO effect on the connections traveling through the VPN.
2) - Addresses. This is probably your issue, but I don't know for sure.
(Again assuming an event type 'response' from the server. The server has to know where to send the event. (This is not a reply
at the TCP/IP level, but instead a separate outbound connection.) The problem may be in how the client system is presenting its
address to the server. In other words the client could be telling the server it actual LAN address (the address associated with
its NIC) instead of the address associated with its VPN.
What I don't know is what mechanism remoting uses to 'capture' the address of a client when it will be needed to fire the events.
HTH.
On Thu, 18 Aug 2005 07:33:08 -0700, Rich Wood <RichWood@xxxxxxxxxxxxxxxx> wrote:
>My application consists of a client and server that communicate via a Tcp
>Channel. The client sends requests to the server which then sends data back
>to the client. It works fine for clients on the LAN but not for clients
>connected to the LAN through VPN. The clients are able to send requests to
>the server, but when the server tries to send the data back to the clients,
>I'm getting timeout errors. I suppose it's possible that it's just really
>slow through VPN and that given more time it would eventually work. I don't
>think this is the case since the communication to the server works and since
>in the same application I'm able to get data from a sql server database
>through VPN without much of a time lag.
>
>It seems to me like a connectivity or firewall problem. However, I'm able to
>ping the client machine from the server machine and I'm under the (possibly
>mistaken) impression that when a client makes a VPN connection to a LAN, it
>has the same access through the firewall as machines on the local LAN. The
>firewall doesn't block outbound traffic.
>
>Any help would be greatly appreciated.
-------------------------------------------
Roy Chastain
KMSYS Worldwide, Inc.
http://www.kmsys.com
.
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