WRT350N: Unable to connect or ping wireless client on LAN, and reconnect issue

I own a WRT350N (V2.00.17), it's a great piece of hardware. But I can't seem to connect to a client connected over the wifi. In the terms of "ping":
* ping wifi-client from wired-client - Not OK
* ping wifi-client from other wifi-client - Not OK
* ping wired-client from wif-client - OK
* ping wired-client from other wired-client - Not OK
Another example:
I have a server (192.168.1.100) on wifi serving Windows shares, this server is on wifi. All the clients on the LAN is also on wifi, however trying to connect to the server with \\192.168.1.100 returns a timeout message. I have created a port forward rule that forwards all traffic on 137-139 to 192.168.1.100. If my public IP is 123.123.123.123 I then can connect to my Windows shares on the server via \\123.123.123.123
Another issue is that if a wifi-client is inactive network-wise for some time (perhaps as low as 5 minutes) the wifi-client needs to reconnect to the router, could this be "fixed" on the router-side?
Regards
//archangel
Solved!
Go to Solution.

It seems that the "AP Isolation" option had a hickup. Enabled it, saved, disabled it, saved. Now it's working.

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