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We are setting up MaxExchange and seeing some strange problems when trying to use it over DSL modems.

To begin with we set up a test system between two PCs in the office. We had this working well using active connections (passive connections seemed to give a 'delete' error!), though we are not completey certain about the difference between active and passive (related to allocation of port numbers?)

Now we are trying to get it to work over the Internet. We set up a new MaxExchange server and exposed it on a static IP address through our firewall on port 1021. We can then successfully synchronise with it when we use a dial-up connection to get on to the Internet. Great!

However, we have some users working through DSL modems and behind routers. When we try to connect a MaxExchange Remote through this path, the ftp test just reports Address Book ID error.

I am guessing that the local router is not forwarding the correct port numbers. However, I do not want to have to reconfigure all of the remote offices routers specifically for Maximizer. And what happens when users are sat on hotel networks or at WiFi hotspots?

Has anyone got any experience of this? What are the actual differences between active and passive? (We found a document on the Maximizer support site that suggests Remote sites need to have ports 10035 open, only if active connections are in use).

Quite technical questions, but I hope someone has experience in this area.

Thanks,
Mark
Original Post
I now have a much better understanding of ftp and the difference between Passive and Active connections. (Probably better than I really wanted ;-)

We realised that we ought to be focussing Passive connections and, after much head-scratching, also that we had a configuration problem with our port opening at the server machine. The two were working against each other to obscure the problem.

For Active connections (which worked over a dial-up connection, but not through a DSL router), the router near the server was happily allowing any port out and responses on the same port. Incoming port activity was blocked, hence breaking Passive connections.

Regards,
Mark

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