macOS Catalina does not allow incoming connections from local network. Firewall is down I starting facing this issue some days ago. Even when the firewall is down, I can't reach my mac from my local network. Ping is not responding neither. Some test I've done:
From my console
nrossi@~$ netstat -an | grep 8080                                              
tcp46      0      0  *.8080                 *.*                    LISTEN 

nrossi@~$ sudo /usr/libexec/ApplicationFirewall/socketfilterfw --getglobalstate
Firewall is disabled. (State = 0)

nrossi@~$ ifconfig | grep &quot;inet &quot; | grep -Fv 127.0.0.1 | awk '{print $2}' 
10.1.2.123

nrossi@~$ curl -I 10.1.2.123:8080                                              
HTTP/1.1 200 
Content-Type: text/html;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 18 Mar 2021 13:06:46 GMT

From other computers
nrossi@~$ curl -I 10.1.2.123:8080
curl: (7) Failed to connect to 10.1.2.123 port 8080: Operation timed out

nrossi@~$ ping 10.1.2.123
PING 10.1.2.123 (10.1.2.123): 56 data bytes
Request timeout for icmp_seq 0

Any help ?
I've finally found the solution to this issue. First of all I listed the macos extensions:
$ kextstat | grep -v com.apple

Index Refs Address            Size       Wired      Name (Version) UUID &lt;Linked Against&gt;
  115    0 0xffffff7f83ef2000 0x29000    0x29000    com.intel.kext.intelhaxm (7.5.1) D0CC7B8F-1F62-33B1-BE6B-B5573D2A607B &lt;8 6 5 3 1&gt;
  176    0 0xffffff7f846db000 0x31000    0x31000    com.checkpoint.cpfw (1.0) A38506C9-F70F-356C-9AF5-67B70391CF36 &lt;6 5 3 1&gt;

The checkpoint extensions was my first candidate to remove. So I run the uninstaller:
$ cd /Library/Application\ Support/Checkpoint/Endpoint\ Security
$ sudo ./uninstall

Everything is working fine now.