Windows 10: Strange behavior Windows 10 firewall

Discus and support Strange behavior Windows 10 firewall in AntiVirus, Firewalls and System Security to solve the problem; I have written a tcp client application which shall create a connection to a unix system. I have following strange behavior with activated firewall on... Discussion in 'AntiVirus, Firewalls and System Security' started by Anna123, May 4, 2021 at 6:47 AM.

  1. Anna123 Win User

    Strange behavior Windows 10 firewall


    I have written a tcp client application which shall create a connection to a unix system. I have following strange behavior with activated firewall on windows 10: Thats what I can see in wireshark: My software on Win10 starts the TCP Connection request with a SYN. the unix system sends a SYN, ACK back My software answers with an ACK the unix system terminates with a FIN This repeats all 5 seconds and after 2-3 minutes suddenly the unix system doesnt terminate the connection but accepts it with a PSH, ACK and then the connection is ok and we can exchange data When I deactivate the firewall on windows 10 then the connection works immediately and doesn't need 2-3 minutes. can someone help me what setting in the firewall could cause this? I always thought either it blocks or it blocks not. But this looks strange to me

    :)
     
  2. Anna123 Win User

    Strange behavior Windows 10 firewall

    I have written a tcp client application which shall create a connection to a unix system. I have following strange behavior with activated firewall on windows 10:

    Thats what I can see in wireshark:
    My software on Win10 starts the TCP Connection request with a SYN.
    the unix system sends a SYN, ACK back
    My software answers with an ACK
    the unix system terminates with a FIN

    This repeats all 5 seconds and after 2-3 minutes suddenly the unix system doesn’t terminate the connection but accepts it with a PSH, ACK and then the connection is ok and we can exchange data

    When I deactivate the firewall on windows 10 then the connection works immediately and doesn't need 2-3 minutes.

    can someone help me what setting in the firewall could cause this? I always thought either it blocks or it blocks not. But this looks strange to me
     
  3. budi Win User
    Registry strange behavior in HKEY_CURRENT_USER\Software\Microsoft\...

    I tried to clear all contents of
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts
    then set security permission to logger user name () to be clear from:

    • create key
    • set value
    and let it inherently apply to all keys under it

    But it responds with icons flickering / blinking very often
    so I undo the security setting.. but while keeping on registry browsing under this key I came across:

    1. The jpg filetype key and userchoice key were created
    2. On userchoice key the logging user () ACL was created, and
    3. It's set to DENY on SET VALUE !


    Strange behavior Windows 10 firewall [​IMG]


    Is it windows 10 behavior or an intruder's been screwing up ?
    Please help me.. many thanks in advance
     
  4. Strange behavior Windows 10 firewall

    Best free AV and firewall

    Can Windows Firewall block outgoing connections yet? If not, it's one step above useless.

    Look into Online Armor for a free firewall.
     
    Deusxmachina, May 5, 2021 at 3:13 AM
    #4
Thema:

Strange behavior Windows 10 firewall

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