Got a real strange one here. Client running SBS 2003 R2, 12 PCs/ laptops running Windows 7 (32 & 64 bit). 3 PCs running XP Been running same setup for years now, no major problems. Now at various time periods the Windows 7 machines will lose connection to Exchange, shared folders & Internet. Usually switching the router (Draytek 2820) off & on resolves the problem for around 15 - 20 minutes. The XP machines have no problem at all, continue to work fine all day. Then usually after 17:00 (end of business) everything works fine until the next morning. Have replaced the router - no difference. Left the machines which are normally switched off at end of day off for a period of time - no difference. It happened first on the 31st May, then no problems until yesterday & today. What I can't understand is why the XP machines work absolutely fine, not a glitch at all. I've tried disabling IPV6 on one of the W7 machines - no difference.

1. Have you tried to used fixes setting for transfer (Full duplex 100Mbps and similar iinstead of Auto) 2. Are there any traces in event logs (on W 7 and SBS)? 3. It does not hurt if you place your question into SBS Technet Forum 4. Have you tried to pinpoint the trouble making W 7 by not starting all W 7s ("round robin"). Chances are, that there is faulty hardware (perhaps network interface card). Regards Milos

1. Have you tried to used fixes setting for transfer (Full duplex 100Mbps and similar iinstead of Auto) 2. Are there any traces in event logs (on W 7 and SBS)? 3. It does not hurt if you place your question into SBS Technet Forum 4. Have you tried to pinpoint the trouble making W 7 by not starting all W 7s ("round robin"). Chances are, that there is faulty hardware (perhaps network interface card). Regards Milos