I have an ongoing problem with an SBS2003 Server. Everything seems to work during the day but I have an issue that at artound 18.30 each day users lose connection to the Server.
However, they do not lose Network connectivity as I can ping the Servers and the Internet works. It is Outlook (running on the Exchange Server) and a shared database that show the problem.
Outlook freezes and if you wait long enough and close it when reopened it prompts for the user name and password. As regards the database the drive mapping is lost which results in the database failing.
If you enter the user name and password into Outlook the drive letters are reconnected and everything will work fine.
During the problem I have had a PC running a ping permanently to the Server and this did not break. I also had a PC downloading a 4Gb file during this time and that worked fine.
SOmeone has suggested a DNS problem and that I run "nslookup ip"
When I do this I get the error: sbserver2003.domainname.local can't find: Non-existent domain.
I believe this is a PTR rpblem. However, when I look at the DNS server and the reverse lookup the server is listed and looks fine.
I have also rerun the Internet Connection Wizard and changed the External IP to a new one to see if that helped.
I am getting desperate as this has been going on for a long time and I have posted different questions here to try and reslove it but nothing is working.
No restrictions are set for user logons and they have the problem whether the are in OUtlook or the Database.