I'm running Windows Small Business Server 2003 R2 Premium edition, and have a recurring issue in which the internal network loses internet connectivity. This happens anywhere from several times a day to once every other day. When the internet goes down, I can't ping outside addresses, either from the server itself or from the internal network. Internal connections work fine. Doing a full reboot of the server restores internet connectivity; running the Configure E-mail and Internet Connection wizard doesn't.
The server has 2 NICs, one of which is connected to an Adtran router, and the other of which goes to the office network. Neither shows up as having lost connections when the problem occurs.
The server is running Exchange with IMAP virtual server, ISA 2004, SQL 2005, Symantec Antivirus Corporate, and Backup Exec, and hosting RWW and Outlook Web Access. The only other software running on it is Tripp Lite PowerAlert. All of this software is up-to-date, and the server and clients scan clean for viruses.
So far, I've tried changing out all the Cat5 cables connecting the server to the router, removing the network surge protector on that line, updating drivers, disabling the firewall through the CEICW, and adding in an "allow all outgoing TCP/IP traffic through SecureNAT" rule to ISA. None of this has fixed the problem. RRAS hasn't logged any errors, and the only error showing up in Event Viewer is a one-time collection of errors from the night before saying "The DNS server was unable to complete directory service enumeration of ...," which seems unrelated.
If I configure a laptop with the TCP/IP settings of the external-facing server NIC and plug in the WAN cable, the laptop connects to the internet without a problem, so it's not an ISP issue.
Thanks for your ideas.
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