I'm not a systems engineer, but I can do the basics. I've inherited a Lotus Notes setup in my new job. I've no experience with Lotus Notes/Domino, however.
Everything was working fine.
Today the router died and I replaced it (with a D-Link DSL-2740B). Setup seemed to go okay, and Lotus Notes works fine for computers within the LAN. It also works fine for sending emails to external addresses.
It doesn't work outside the LAN: people cannot connect to the server, and we're not getting any emails that are sent from outside addresses.
Webmail (previously at mail.mycompany.com) doesn't work any more (it fails with a "The connection to the server was reset while the page was loading." error).
I strongly suspect that this is a port forwarding or firewall issue. I've tried forwarding ports 80, 1352, and 25 through to the correct server. A port scan shows that ports 25 and 1352 are fine, but that port 80 failed with a "No connection could be made because the target machine actively refused it" error.
So I'm stumped. I don't know how the old router was setup to allow the webmail or notes traffic in. At this moment in time I'm more concerned about getting webmail up and running because that, at least, will allow people to start collecting emails.
Please do point me in the right direction for further diagnosis, reading, or whatever I need to do to get this fixed. Thanks!