Sleep blocked by "active remote client"

Question

Using powercfg -requests I get:
[DRIVER] Filesystem\srvnet
An active remote client has recently sent requests to this machine
This blocks sleep mode (a "feature" of sleep mode).
I have tried disabling wake for sleep on adaptors.  Disabling home group. disabling media center, unistalling windows media, disable auto update, no media sharing....
Because there is a long timeout of maybe 15 minutes or longer on this it so it is hard to diagnose if it is coming from the local machine or the other Win 7 on the network.  The problem seemed to start when I upgrade the second machine from Vista though not 100% sure.
Seems like each machine keeps the other awake?  I have also suspected the Dlink router and turned all of its "added value" features off.  Where is this "remote client" and how to diagnose?
Is there a setting to at least turn the time out to a minute or less?
One machine runnning Win 7 7600 64 before and after this problem started.  The other was Vista and now Win 7 7600 32 since the problem began in BOTH machines.

Answer 1

Try creating and then leaving a Homegroup between the machine having the sleep problem and the other(s) keeping it awake.
I developed the same insomnia problem described here on one of my networked group of Windows 7 machines after enabling media streaming but declining to create a Homegroup (when the option to create one was presented during the media streaming setup process). 
I struggled with various solutions, all to no avail, except disconnecting the problematic machine from the others on the network (not a solution).  Ultimately I determined that certain other machines on the network would keep the problematic machine awake. 
I was able to identify the affected machines by disconnecting various combinations of machines from the network until the problematic machine slept normally.
Ultimately, the problem disappeared after I created a Homegroup, joined all the affected machines, and then left the Homegroup from all machines.  After a forced sleep using the shutdown menu on all the affected machines, and subsequent manual wake,
they now all sleep and wake normally, as expected, according to the power plan settings.
I suspect that by declining to create the Homegroup when prompted, it leaves some inchoate remnant of Homegroup creation lingering around on one or more machines, which in turn results in repeated requests being sent from one machine to the other, keeping
the other awake.