Old Look@LAN software gives "No packet to read" log error; then won't ping

Question

Yes, before anyone asks the question, I'm still using Look@LAN. It's the best free network discovery and resources program I've seen (but please, if you have suggestions for newer ones, let me know).

INFO: Running Windows 7 Professional tied to a domain, Look@LAN v. 2.50 Build 35.

Recently, Look@LAN hasn't been discovering computers on the network. At first, when I opened the log, it returned each IP scanned with a "No packet to read" error. I went into the compatibility settings and checkmarked "Run this program with compatibility for..." and I selected "Windows XP". I then ran it as an administrator.

Different problem: the "No packet to read" error is gone, but it won't ping any address (even if you type it into the address bar at the top). The only address it "finds" is localhost (and still won't ping it). It refuses to ping, even though the log says:

Ping Request to 192.168.98.1...
Ping Request to 192.168.98.2...

I've opened exceptions in my host computer firewall to allow network discovery and the required Look@LAN services (in "Allow an exception or program through this firewall").

Any suggestions would be much appreciated. Ask questions for clarification if needed.

EDIT: I've found the answer! For those who find this question and wish to know the answer, I've found it after a little digging in my firewall.

Steps to opening ICMPv4 (Look@LAN doesn't support ICMPv6) for ping queries:

 1. Start > Run (Win + R) > "wf.msc"
 2. Inbound Rules > New Rule > Custom > All Programs > ICMPv4 Protocol > Allow the connection
 3. Outbound Rules > New Rule > Custom > All Programs > ICMPv4 > Allow the connection
 4. Launch Look@LAN!

It worked perfectly for me - should for you too! Don't be tricked by the "Look@LAN" opening in your firewall - it doesn't include ICMP queries. If you have a firewall controlled by Group Policy or is set strict by your system administrator, you will need to perform this rule procedure to open up that protocol.