PowerEdge R815 cannot access VMWARE ESXi 5

Hi ,

I am unable to access the ESXi on the R815. I was able to do it before.

I can access IDRAC 6.0 set to the IP address -  192.168.1.99 but ESXi 5 that is defined on 192.168.1.95 is not accessible.

I have connected all the 4 network ports to the switch and yet 192.168.1.95 (ESXi) is not active and I cannot see this port active on the router nor ping to it.
I could do this before, I am not sure what may have caused this.

Any suggestions welcome.

Thanks
Avi