Have SBS2003 with the latest updates applied.
Am running DHCP on the Netgear router which is configured using UPnP.
All setup using the to do list wizards and all working fine.
Every now and again (cant assign any particular frequency) remote web workplace becomes inaccessible (page cannot be displayed) with no errors reported.
Web accessa and email work fine.
As soon as I rerun the Internet connection and Remote working wizard everything works fine again.
Nothing is being changed on the router or server manually so I don't know why this is stopping working and what by running the wizards again is fixing it.
I cannot leave it in this state as the only way to fix is to be on site with the server. There are similar symptoms reported in other posts but all seem to be caused by someone having changed something. As this is happening regularly I'm sure its a technical rather than user problem.
My suspicions are around router settings (port assignments being lost) or DHCP but points go to the person who can explain why this is happening regularly and advise a fix.