3

I cannot even ping my computer from another device inside LAN. I've tried the followings:

  1. Turned on Network Discovery, File&Printer Sharing, Folder Sharing from Network and Sharing Center
  2. Created an allow_all rule in symantec ntp for both directions
  3. Turned off all components of Symantec Endpoint Security (NTP, PTP, even Virus Protection)
  4. Created inbound rule for ICMPv4 protocol in Windows Firewall
  5. Turned off Windows Firewall

After step 2, there was still some logs in Symantec Packet Logs about blocked incoming and outgoing requests from IP 0.0.0.0:0 to 0.0.0.0:0. The applied rules were "Block_all" and "Build-in Allow All IP Traffic" (which were not available in Firewall Rules list) and the detail is:

Ethernet II (Packet Length: 42)
    Destination:  c4-9a-02-12-6a-dd
    Source:  34-02-86-98-40-fe
Type: ARP (0x0806)
Address Resolution Protocol (ARP)
    Hardware type: Ethernet (0x0001)
    Protocol type: IP (0x0800)
    Hardware size: 6
    Protocol size: 4
    Opcode: Response
    Sender hardware address: 34-02-86-98-40-fe
    Sender IP address: 192.168.1.101
    Target hardware address: c4-9a-02-12-6a-dd
    Target IP address: 192.168.1.104

Note: 192.168.1.104 is the device that sends ping request.

Feyyaz
  • 141

3 Answers3

1

Did you adjust remote settings? Right click My Computer, click on remote settings, be sure check box is ticked. In advanced, have check box for Allow remote Assistance ticked

11111

enter image description here

enter image description here

Carl B
  • 6,660
1

ARP and ICMP (Echo requests or ping) packets are often times disabled completely. You need to completely disable everything one by one until you weed out the issue. I would personally pop open wireshark and see where the packets are going or getting dropped. Wireshark can read past the firewall. You'll be able to see if its just your computer or sending computer.

cloudnyn3
  • 181
1

Well, the problem was neither Windows Firewall nor Symantec, as some of you have already suspected, it was another application that I didn't realize at first: Checkpoint Endpoint Security.

It is required for us to make VPN connections to the company. It has its own firewall that Windows doesn't detect. Even if VPN is not active, its firewall works and blocks everything, silly. And it cannot be disabled because of company policy.

The solution was to completely uninstall Checkpoint Endpoint Security :).

Thank you for all your efforts.

Feyyaz
  • 141