ESP8266 Community Forum

Ok, Plan B... Try to disable Windows Firewall AND any antivirus software/suite/whatever. If this fail, use Wireshark and try to monitor MDNS traffic. Plan C would be to try to install portable Arduino version and (when asking) allow all network communications in the firewall settings. Plan D then - don't use Windows (I'm out of plans actually...).

hmm, there are WiFi routers where
a) WiFi can be isolated from LAN, only allowing access to WAN.
b) WiFi stations are isolated from each other
Just for plan E ... check router settings, move PC from LAN to WiFI or vice versa

If the WiFi router does have Station isolation option turned on, there the ESP cannot be pinged...

Pablo2048 wrote:Ok, Plan B... Try to disable Windows Firewall AND any antivirus software/suite/whatever. If this fail, use Wireshark and try to monitor MDNS traffic. Plan C would be to try to install portable Arduino version and (when asking) allow all network communications in the firewall settings. Plan D then - don't use Windows (I'm out of plans actually...).

schufti wrote:hmm, there are WiFi routers where
a) WiFi can be isolated from LAN, only allowing access to WAN.
b) WiFi stations are isolated from each other
Just for plan E ... check router settings, move PC from LAN to WiFI or vice versa

Special thanks guys, It worked well now.

After 2 hours of error and error xD , by the help of Wireshark.

Tried several crossing things as Cleared EEPROM of NodeMCU and trying my mobile hotspot and disabling windows and ESET firewalls, then tried a new NodeMCU and which then solved problem of network port appearance.

* Some firewall permissions were asked by this operation, as from java.

Then got back to my router. tampered with router settings, with negative effect.
lastly i restored router settings to default.


Now i run back all firewalls (rules applied) and all things are going well now.

So mostly the error was caused by some router settings.


Thanks