OursPolaire
You should really take this back to the bug report you lodged.
http://bugs.contribs.org/show_bug.cgi?id=3214Follow through on this until a resolution is reached.
You are spreading the issue around in different forum posts, which is a wrong thing to do.
You are trying to diagnose your problem by elimination, but it seems to me you are chasing/blaming the wrong things. I don't think your knowledge is sufficient to diagnose this, certainly the approach you are taking is scattered.
Charlie (who would most likely know more about sme server than anyone else) has asked you for more specific information, so you should provide that.
If you don't know what he specifically wants then ask in the bug report.
I would suggest the following to start with: a much more detailed description of your server, what mode it is setup in (server or server gateway etc), what router modem etc you have attached, what the network general configuration is, what ISP & type of ADSL or otherwise connection you are using, what hardware specs on your server you are using, and a complete listing of all the settings from the server manager Review configuration panel, for a start.
More specific log files or db settings may well be asked for later.
Also search your log files (server manager View log files panel) eg the messages log to start with, for any likely error messages or similar from about the time the IP changes.
Post this to the bug report, not to this or any other forum post !
You should also ensure that your server is upgraded to the latest release, which is 7.2, use the software installer panel to do this, and read the FAQ to see if any of that info re yum updates and repositories is applicable.
http://wiki.contribs.org/SME_Server:Documentation:FAQ#Yum_UpdatesRead the whole section down to and including "General", not just the first few lines.