After reading the several posts regarding the difficulties setting IM server up in a network that is behind a firewall performing NAT. I figured I'd drop a bit of information out here and hopefully clear things up. There are a few very important things to remember. First and foremost, the NAT gateway host, for best results, should be the external IP of the NAT device (ie. whatever your domain name resolves to from outside the network). Secondly, you MUST be forwarding all traffic for TCP port 5177 to the machine running IM Server. Another important piece of information is that the host name and domain name of the server (found in TCP/IP properties) CAN NOT be the same as the host name and domain of the NAT device. When you are creating user accounts for IM, the user account must reflect the public host name, example: the domain name of the server is IM.Domain.com, then users will have to log on as [EMAIL PROTECTED] to successfully authenticate. The final thing coming to mind is that for all users inside and outside to communicate successfully, there are 3 places to ping from...outside the network, inside the network, and from the server itself. You will need to ping the host name that the users are logging onto (IM.domain.com), and from all three of these places, that hostname must resolve to the same IP address.
Keep in mind also, that if your clients are also behind a firewall, they will need to enable client uses NAT on their local machine. This can be found in the registry at HKEY_CURRENT_USER\Software\Ipswitch\Messenger\Version 1.0\Settings. You will see a value "client uses nat" and will need to change that integer to 1. Should this be a tad unclear (I tend to get that way from time to time), in the help for server manager, search for NAT and it will give detailed instructions with screenshots that may be a bit more helpful. If all the above is correct, there are very few instances that clients inside the network will not be able to chat with clients outside the network. Should there be any other questions, you can always go to http://askatech.ipswitch.com and fill out the support form. Please be as detailed as possible when sending your support request. We are here to help you as much as possible, so don't hesitate to drop support a line. -HJ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/ipswitchim_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/Instant_Messenger/index.asp
