Sbs 2003 1 NIC No Internet and DHCP not working

connect to the internet wizard runs with no problems?  Please post ipconfig /all from the server and workstations.  Also are there any errors logges in the system event log when the server loses connectivity?

Server Ip
Ip Config /all
10.10.10.100
10.10.10.50 default gateway (Netgear RP2014 Router
DNS 10.10.10.50 (used 10.10.10.100 before)

workstations get Ip from DHCP- on server-
Reads no connection cable unplugged, but if I use a manual address like
10.10.10.241- manually configured
10.10.10.50 default gateway & DNS
255.255.255.0

Connects to internet just fine
good ping from router 10.10.10.50
no ping from 10.10.10.100

From Workstation to router ping is good
From Workstation to server No Ping
From Server to router no ping

On server tried to repair LAN connection
Windows cant clear ARP cache
WHat am I missing?

Thanks

BTW I tried swathing to the WAN NIC- enabled it and disabled LAN nic- Configured with same IP info- no good
This appears to be a base level problem the Server niches are not getting any return traffic lots of packets out 0 back
Successful pings from Workstations to workstations and workstations to router.

Cant figure it out

The server should be pointing to itself for dns and so should your workstations (via dhcp running on the server).  Try changing dns1 to 127.0.0.1 on the server and rerun the connect to internet wizard, then go to your dhcp server mmc and verify that it is issuing its own address as the primary dns server.  

Sbs turns off its dhcp services if it discovers a router or a different device that has dhcp running on it.  It would be present in the server's event logs if that was the case.  How many client workstations in the environment?

Followed that process and DHCP looks good- Issuing server as DNS-
I think the problem I have is lower level- Neither Nic on the server is connecting to the network-
I am only using one that was working fine yesterday- Status = 556 packets sent 0 received. have rebooted server3 times in last hour or there would be a higher sent count

All workstations of the 5 on the network can ping successfully to the router/switch none see or hear from the server. and server cant ping the router.

Something is blocking TCPIP from Server end, Turned off Trend Micro office scan service, Win Firewall, Not running ISA
 Dont know where to look next

Try connecting the server directly to the router, omitting the switch to rule out a switch port issue.  Disconnect the switch from router see if it pingable then.  Look at properties of server's lan and uncheck trnd micro firewall.  Try adjusting the ethernet cards advanced properties to set the link speed to 100 full to see if it makes a difference.  Could a new network card driver have been installed, rollback available?  

Last resort try winsock fix but look for server 2003 version?  

Also connect the server to the switch if connected directly to the router to see if server can be pinged from workstation...  

Also what do your event logs show on the server for system errors and warnings?

took a dinner break, not much changed

 Error logs mostly ntptime errors timeserver cant be connected,
and
event ID 8035 (The browser has forced an election on network \Device\NetBT_Tcpip_{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} because the Domain Controller (or Server) has changed its role.)
 and several VPN
Remote access errors, cannot reach DHCP server
Disconnected router from switch, connected server directly to router and then directly to switch still no pings

Looking at network from my macbook which is connected to the switch which is connected to the router and Internet with no problems,  arp -a shows

? (10.10.10.22) at 0:e0:18:5:ad:2f on en0 ifscope [ethernet]
? (10.10.10.50) at 0:30:ab:7:8a:ed on en0 ifscope [ethernet]
? (10.10.10.241) at 0:1a:a0:20:3c:fe on en0 ifscope [ethernet]
? (10.10.10.255) at (incomplete) on en0 ifscope [ethernet]
? (10.37.129.2) at 0:1c:42:0:0:9 on vnic1 ifscope permanent [ethernet]
? (10.37.129.255) at ff:ff:ff:ff:ff:ff on vnic1 ifscope [ethernet]
? (10.211.55.2) at 0:1c:42:0:0:8 on vnic0 ifscope permanent [ethernet]
? (10.211.55.255) at ff:ff:ff:ff:ff:ff on vnic0 ifscope [ethernet]

Server 10.0.0.100 nowhere to be found, it's an island
no new network drivers, worked yesterday and I tried with the Wan interface as well.
So will have to look for winsock 03server?

Reinstalled drivers for intel card- still getting destination unreachable to all connected nets from 10.10.10.100

but now see my macbook pros ip in the servers rap -a

and see the server ip without a mac address in my macs rap -a

macbpro:~ probook$ arp -a
? (10.10.10.22) at 0:e0:18:5:ad:2f on en0 ifscope [ethernet]
? (10.10.10.50) at 0:30:ab:7:8a:ed on en0 ifscope [ethernet]
? (10.10.10.100) at (incomplete) on en0 ifscope [ethernet]
? (10.10.10.241) at 0:1a:a0:20:3c:fe on en0 ifscope [ethernet]
? (10.10.10.255) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet]
? (10.37.129.2) at 0:1c:42:0:0:9 on vnic1 ifscope permanent [ethernet]
? (10.211.55.2) at 0:1c:42:0:0:8 on vnic0 ifscope permanent [ethernet]
Vmacbpro:~ probook$

Anybody? I have to get this thing back up in 3 more hours and have tried everything I can think of. Reset Winsock, IPv4 , nothing works, the only subnet is 10.10.10.0 all of the workstations are connected to the same switch as the server, they all can see each other -they are using static addresses since DHCP comes from the server that they cant get to. THere is network attached printer at 10.10.10.40 that seems to know when I make changes to the server, it sends errors when it senses the release, so there is some something getting thru, but net statistics for the server neck show lots of sent packets 0 received back.
I have switched between the 2 nic's , am only using one but have 2 I disable one. The one I am using is labeled as LAN .
I wonder if IP sec is blocking something?

Try installing a new network card in the server perhap integrated ethernet is failing?  Try different ethernet cable?

Thanks did all of that

This has to be a service issue- not hardware- I have tested all of it over the last 48 hours.
Ip Sec, , kerberos something that can block tcpip and icmp, and its outside of the tcpip stack which reset already. I just cant find it. What kind of service could do this ? ICS firewall is off, trend micro, bindings checked. the behavior is the same no matter which nic I try...

Awesome news.  Wish I had thought of suggesting that.  I've seen IPNAT cause these issues in the past, but my focus was on the NIC.

Worked with MS support to get to this