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[GH-ISSUE #926] esp32: Captive Portal does not work on windows 10 #786

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opened 2026-02-28 01:27:02 +03:00 by kerem · 11 comments
kerem commented 2026-02-28 01:27:02 +03:00
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Originally created by @amrlsayed on GitHub (Aug 15, 2019).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/926

Basic Infos

Hardware

ESP32 WROOM
WiFimanager Branch/Release:

  • Master
  • Development

Esp8266/Esp32:

  • ESP8266
  • ESP32

Hardware: ESP-12e, esp01, esp25

  • ESP01
  • ESP12 E/F/S (nodemcu, wemos, feather)
  • Other (ESP32 Wroom)

**ESP32 Core Version:

  • 1.0.2 ( Downloaded from Arduino Board Manager)

Description

I have a more complex project. but to make it simple I am testing only the "OnDemandConfigPortal" Example. It works Good on Android but not on Windows 10. I tried disabling the firewall without luck.
when I connect to the AP from the PC I see this debug message more frequently

dhcps: send_offer>>udp_sendto result 0
dhcps: send_offer>>udp_sendto result 0

I think those are not errors because result 0 is the LWIP ERR_OK
sometimes when i connect to the AP. it redirects me to msn.com but then when i type the IP (192.168.4.1) on the browser I get no response "ERR_CONNECTION_TIMEOUT" then the output in the serial terminal is

*WM: [3] -> www.msftconnecttest.com 
*WM: [2] <- Request redirected to captive portal 
*WM: [3] -> www.msftconnecttest.com 
*WM: [2] <- Request redirected to captive portal 
*WM: [3] -> wpad.mt.local 
*WM: [2] <- Request redirected to captive portal 
*WM: [2] <- HTTP Root 
*WM: [3] -> 192.168.4.1

when I type ipconfig on windows cmd. I find that it gets an IP from the AP

Wireless LAN adapter Wi-Fi:
   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::1c0c:5a92:c42f:6a4e%3
   IPv4 Address. . . . . . . . . . . : 192.168.4.2
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.4.1

Settings in IDE

Module: ESP32 Dev Module

Additional libraries:
no additional libraries

Sketch


/**
 * OnDemandConfigPortal.ino
 * example of running the configPortal AP manually, independantly from the captiveportal
 * trigger pin will start a configPortal AP for 120 seconds then turn it off.
 * 
 */
#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager

// select which pin will trigger the configuration portal when set to LOW
#define TRIGGER_PIN 0

int timeout = 120; // seconds to run for

void setup() {
  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP  
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("\n Starting");
  pinMode(TRIGGER_PIN, INPUT_PULLUP);
}

void loop() {
  // is configuration portal requested?
  if ( digitalRead(TRIGGER_PIN) == LOW) {
    WiFiManager wm;    

    //reset settings - for testing
    //wifiManager.resetSettings();
  
    // set configportal timeout
    wm.setConfigPortalTimeout(timeout);

    if (!wm.startConfigPortal("OnDemandAP")) {
      Serial.println("failed to connect and hit timeout");
      delay(3000);
      //reset and try again, or maybe put it to deep sleep
      ESP.restart();
      delay(5000);
    }

    //if you get here you have connected to the WiFi
    Serial.println("connected...yeey :)");

  }

  // put your main code here, to run repeatedly:
}

Debug Messages

WM: [3] WIFI station disconnect 
*WM: [3] WiFi station enable 
*WM: [2] Disabling STA 
*WM: [2] Enabling AP 
*WM: [1] StartAP with SSID:  OnDemandAP
*WM: [2] AP has anonymous access! 
*WM: [1] AP IP address: 192.168.4.1
*WM: [3] setupConfigPortal 
*WM: [1] Starting Web Portal 
*WM: [3] dns server started with ip:  192.168.4.1
*WM: [2] HTTP server started 
*WM: [2] WiFi Scan ASYNC started 
*WM: [2] Config Portal Running, blocking, waiting for clients... 
dhcps: send_offer>>udp_sendto result 0
dhcps: send_offer>>udp_sendto result 0
*WM: [3] -> www.msftconnecttest.com 
*WM: [2] <- Request redirected to captive portal 
*WM: [3] -> www.msftconnecttest.com 
*WM: [2] <- Request redirected to captive portal 
*WM: [3] -> wpad.mt.local 
*WM: [2] <- Request redirected to captive portal 
*WM: [2] <- HTTP Root 
*WM: [3] -> 192.168.4.1

Before opening this issue. I tested CaptivePortal Example from ESP32 Arduino SDK examples. it didn't work for windows but worked on Android. I though it might be related so I put a comment on this issue reporting the problem. I got the suggestion to open a new issue here though.

Thanks a lot

Originally created by @amrlsayed on GitHub (Aug 15, 2019). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/926 ### Basic Infos #### Hardware ESP32 WROOM **WiFimanager Branch/Release:** - [ ] Master - Development **Esp8266/Esp32:** - [ ] ESP8266 - ESP32 **Hardware: ESP-12e, esp01, esp25** - [ ] ESP01 - [ ] ESP12 E/F/S (nodemcu, wemos, feather) - Other (ESP32 Wroom) **ESP32 Core Version: - 1.0.2 ( Downloaded from Arduino Board Manager) ### Description I have a more complex project. but to make it simple I am testing only the "OnDemandConfigPortal" Example. It works Good on Android but not on Windows 10. I tried disabling the firewall without luck. when I connect to the AP from the PC I see this debug message more frequently ``` dhcps: send_offer>>udp_sendto result 0 dhcps: send_offer>>udp_sendto result 0 ``` I think those are not errors because result 0 is the LWIP ERR_OK sometimes when i connect to the AP. it redirects me to msn.com but then when i type the IP (192.168.4.1) on the browser I get no response "ERR_CONNECTION_TIMEOUT" then the output in the serial terminal is ``` *WM: [3] -> www.msftconnecttest.com *WM: [2] <- Request redirected to captive portal *WM: [3] -> www.msftconnecttest.com *WM: [2] <- Request redirected to captive portal *WM: [3] -> wpad.mt.local *WM: [2] <- Request redirected to captive portal *WM: [2] <- HTTP Root *WM: [3] -> 192.168.4.1 ``` when I type ipconfig on windows cmd. I find that it gets an IP from the AP ``` Wireless LAN adapter Wi-Fi: Connection-specific DNS Suffix . : Link-local IPv6 Address . . . . . : fe80::1c0c:5a92:c42f:6a4e%3 IPv4 Address. . . . . . . . . . . : 192.168.4.2 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.4.1 ``` ### Settings in IDE Module: ESP32 Dev Module Additional libraries: no additional libraries ### Sketch ```cpp /** * OnDemandConfigPortal.ino * example of running the configPortal AP manually, independantly from the captiveportal * trigger pin will start a configPortal AP for 120 seconds then turn it off. * */ #include <WiFiManager.h> // https://github.com/tzapu/WiFiManager // select which pin will trigger the configuration portal when set to LOW #define TRIGGER_PIN 0 int timeout = 120; // seconds to run for void setup() { WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP // put your setup code here, to run once: Serial.begin(115200); Serial.println("\n Starting"); pinMode(TRIGGER_PIN, INPUT_PULLUP); } void loop() { // is configuration portal requested? if ( digitalRead(TRIGGER_PIN) == LOW) { WiFiManager wm; //reset settings - for testing //wifiManager.resetSettings(); // set configportal timeout wm.setConfigPortalTimeout(timeout); if (!wm.startConfigPortal("OnDemandAP")) { Serial.println("failed to connect and hit timeout"); delay(3000); //reset and try again, or maybe put it to deep sleep ESP.restart(); delay(5000); } //if you get here you have connected to the WiFi Serial.println("connected...yeey :)"); } // put your main code here, to run repeatedly: } ``` ### Debug Messages ``` WM: [3] WIFI station disconnect *WM: [3] WiFi station enable *WM: [2] Disabling STA *WM: [2] Enabling AP *WM: [1] StartAP with SSID: OnDemandAP *WM: [2] AP has anonymous access! *WM: [1] AP IP address: 192.168.4.1 *WM: [3] setupConfigPortal *WM: [1] Starting Web Portal *WM: [3] dns server started with ip: 192.168.4.1 *WM: [2] HTTP server started *WM: [2] WiFi Scan ASYNC started *WM: [2] Config Portal Running, blocking, waiting for clients... dhcps: send_offer>>udp_sendto result 0 dhcps: send_offer>>udp_sendto result 0 *WM: [3] -> www.msftconnecttest.com *WM: [2] <- Request redirected to captive portal *WM: [3] -> www.msftconnecttest.com *WM: [2] <- Request redirected to captive portal *WM: [3] -> wpad.mt.local *WM: [2] <- Request redirected to captive portal *WM: [2] <- HTTP Root *WM: [3] -> 192.168.4.1 ``` Before opening this issue. I tested CaptivePortal Example from ESP32 Arduino SDK examples. it didn't work for windows but worked on Android. I though it might be related so I put a comment on this [issue](https://github.com/espressif/arduino-esp32/issues/1186#issuecomment-521639117) reporting the problem. I got the suggestion to open a new issue here though. Thanks a lot
kerem commented 2026-02-28 01:27:03 +03:00
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@viperk1 commented on GitHub (Oct 3, 2019):

I'm running into the same issue. Hope this can be diagnosed!

<!-- gh-comment-id:537757635 --> @viperk1 commented on GitHub (Oct 3, 2019): I'm running into the same issue. Hope this can be diagnosed!
kerem commented 2026-02-28 01:27:03 +03:00
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@tablatronix commented on GitHub (Oct 3, 2019):

check firewall

<!-- gh-comment-id:538116411 --> @tablatronix commented on GitHub (Oct 3, 2019): check firewall
kerem commented 2026-02-28 01:27:03 +03:00
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@amrlsayed commented on GitHub (Oct 5, 2019):

Hi Shawn,
I disabled the firewall but same problem.
Do you mean it's working good with you on windows and the problem would be our environment such as Firewall ?

<!-- gh-comment-id:538659161 --> @amrlsayed commented on GitHub (Oct 5, 2019): Hi Shawn, I disabled the firewall but same problem. Do you mean it's working good with you on windows and the problem would be our environment such as Firewall ?
kerem commented 2026-02-28 01:27:03 +03:00
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@tablatronix commented on GitHub (Oct 5, 2019):

No, windows 10 firewall can block captive portals

<!-- gh-comment-id:538676629 --> @tablatronix commented on GitHub (Oct 5, 2019): No, windows 10 firewall can block captive portals
kerem commented 2026-02-28 01:27:03 +03:00
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@connornishijima commented on GitHub (Dec 4, 2019):

It doesn't work on a Galaxy S8 running Android 9 (Pie)

<!-- gh-comment-id:561459125 --> @connornishijima commented on GitHub (Dec 4, 2019): It doesn't work on a Galaxy S8 running Android 9 (Pie)
kerem commented 2026-02-28 01:27:03 +03:00
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@iw2lsi commented on GitHub (May 27, 2021):

same problem here... on Windows 10 the captive portal is not opened... and the connection is not established; seems to works on iOS.

<!-- gh-comment-id:849709797 --> @iw2lsi commented on GitHub (May 27, 2021): same problem here... on Windows 10 the captive portal is not opened... and the connection is not established; seems to works on iOS.
kerem commented 2026-02-28 01:27:03 +03:00
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@tablatronix commented on GitHub (May 27, 2021):

Try without firewall ?

<!-- gh-comment-id:849720049 --> @tablatronix commented on GitHub (May 27, 2021): Try without firewall ?
kerem commented 2026-02-28 01:27:03 +03:00
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@iw2lsi commented on GitHub (May 27, 2021):

Hi,

yes... firewall was not enabled...

   Giampaolo

Il giorno gio 27 mag 2021 alle ore 17:16 Shawn A @.***>
ha scritto:

Try without firewall ?

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<!-- gh-comment-id:849731396 --> @iw2lsi commented on GitHub (May 27, 2021): Hi, yes... firewall was not enabled... Giampaolo Il giorno gio 27 mag 2021 alle ore 17:16 Shawn A ***@***.***> ha scritto: > Try without firewall ? > > — > You are receiving this because you commented. > Reply to this email directly, view it on GitHub > <https://github.com/tzapu/WiFiManager/issues/926#issuecomment-849720049>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AAODQQCSPUU4VYVMXA2BWZTTPZO55ANCNFSM4IL7ZLHA> > . >
kerem commented 2026-02-28 01:27:03 +03:00
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@tablatronix commented on GitHub (May 27, 2021):

It has been awhile since I last used windows 10, have you disabled other network connections ?

<!-- gh-comment-id:849738806 --> @tablatronix commented on GitHub (May 27, 2021): It has been awhile since I last used windows 10, have you disabled other network connections ?
kerem commented 2026-02-28 01:27:03 +03:00
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@iw2lsi commented on GitHub (May 27, 2021):

Hi Shawn,

that's a good point... I have a wired network too... I'm checking it
right now...

    Giampaolo

Il giorno gio 27 mag 2021 alle ore 17:42 Shawn A @.***>
ha scritto:

It has been awhile since I last used windows 10, have you disabled other
network connections ?

—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
https://github.com/tzapu/WiFiManager/issues/926#issuecomment-849738806,
or unsubscribe
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<!-- gh-comment-id:849742464 --> @iw2lsi commented on GitHub (May 27, 2021): Hi Shawn, that's a good point... I have a wired network too... I'm checking it right now... Giampaolo Il giorno gio 27 mag 2021 alle ore 17:42 Shawn A ***@***.***> ha scritto: > It has been awhile since I last used windows 10, have you disabled other > network connections ? > > — > You are receiving this because you commented. > Reply to this email directly, view it on GitHub > <https://github.com/tzapu/WiFiManager/issues/926#issuecomment-849738806>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AAODQQEBDM7YWZSDNEGRHJDTPZR4ZANCNFSM4IL7ZLHA> > . >
kerem commented 2026-02-28 01:27:03 +03:00
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@iw2lsi commented on GitHub (May 27, 2021):

Hi...

no... it does not work even with the wired card disabled... this is the
log... could it just be a timeout problem ?

     Giampaolo

Starting
*WM: [3] allocating params bytes: 20
*WM: [2] Added Parameter:
*WM: [1] AutoConnect
*WM: [1] No Credentials are Saved, skipping connect
*WM: [2] Starting Config Portal
*WM: [2] AccessPoint set password is VALID
*WM: [1] password
*WM: [3] WIFI station disconnect
*WM: [3] WiFi station enable
*WM: [2] Disabling STA[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 3 -
STA_STOP
[2] Enabling AP
*WM: [1] StartAP with SSID: AutoConnectAP
[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 0 - WIFI_READY
*WM: [1] SoftAP Configuration
*WM: [1] --------------------
*WM: [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 14 - AP_START
*WM: [1] password: password
*WM: [1] ssid_len: 13
*WM: [1] channel: 1
*WM: [1] authmode:
*WM: [1] ssid_hidden:
*WM: [1] max_connection: 4
*WM: [1] country: CN

*WM: [1] beacon_interval: 100(ms)
*WM: [1] --------------------
*WM: [1] AP IP address: 192.168.4.1
*WM: [3] setupConfigPortal
*WM: [1] Starting Web Portal
*WM: [3] dns server started with ip: 192.168.4.1
*WM: [2] HTTP server started
[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 2 - STA_START
[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 1 - SCAN_DONE
*WM: [2] WiFi Scan completed in 5304 ms
*WM: [2] Config Portal Running, blocking, waiting for clients...
[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 16 - AP_STACONNECTED
[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 18 - AP_STAIPASSIGNED
*WM: [2] Portal Timeout In 3 seconds
*WM: [1] config portal has timed out
*WM: [3] configportal abort
*WM: [2] disconnect configportal
*WM: [0] [ERROR] disconnect configportal - softAPdisconnect FAILED
*WM: [2] restoring usermode STA
*WM: [2] wifi status: WL_DISCONNECTED
*WM: [2] wifi mode: STA
*WM: [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 15 - AP_STOP
[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 15 - AP_STOP

Il giorno gio 27 mag 2021 alle ore 17:46 Giampaolo Bellini @.***>
ha scritto:

Hi Shawn,

that's a good point... I have a wired network too... I'm checking it
right now...

    Giampaolo

Il giorno gio 27 mag 2021 alle ore 17:42 Shawn A @.***>
ha scritto:

It has been awhile since I last used windows 10, have you disabled other
network connections ?

—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
https://github.com/tzapu/WiFiManager/issues/926#issuecomment-849738806,
or unsubscribe
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<!-- gh-comment-id:849745053 --> @iw2lsi commented on GitHub (May 27, 2021): Hi... no... it does not work even with the wired card disabled... this is the log... could it just be a timeout problem ? Giampaolo Starting *WM: [3] allocating params bytes: 20 *WM: [2] Added Parameter: *WM: [1] AutoConnect *WM: [1] No Credentials are Saved, skipping connect *WM: [2] Starting Config Portal *WM: [2] AccessPoint set password is VALID *WM: [1] password *WM: [3] WIFI station disconnect *WM: [3] WiFi station enable *WM: [2] Disabling STA[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 3 - STA_STOP [2] Enabling AP *WM: [1] StartAP with SSID: AutoConnectAP [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 0 - WIFI_READY *WM: [1] SoftAP Configuration *WM: [1] -------------------- *WM: [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 14 - AP_START *WM: [1] password: password *WM: [1] ssid_len: 13 *WM: [1] channel: 1 *WM: [1] authmode: *WM: [1] ssid_hidden: *WM: [1] max_connection: 4 *WM: [1] country: CN *WM: [1] beacon_interval: 100(ms) *WM: [1] -------------------- *WM: [1] AP IP address: 192.168.4.1 *WM: [3] setupConfigPortal *WM: [1] Starting Web Portal *WM: [3] dns server started with ip: 192.168.4.1 *WM: [2] HTTP server started [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 2 - STA_START [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 1 - SCAN_DONE *WM: [2] WiFi Scan completed in 5304 ms *WM: [2] Config Portal Running, blocking, waiting for clients... [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 16 - AP_STACONNECTED [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 18 - AP_STAIPASSIGNED *WM: [2] Portal Timeout In 3 seconds *WM: [1] config portal has timed out *WM: [3] configportal abort *WM: [2] disconnect configportal *WM: [0] [ERROR] disconnect configportal - softAPdisconnect FAILED *WM: [2] restoring usermode STA *WM: [2] wifi status: WL_DISCONNECTED *WM: [2] wifi mode: STA *WM: [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 15 - AP_STOP [D][WiFiGeneric.cpp:374] _eventCallback(): Event: 15 - AP_STOP Il giorno gio 27 mag 2021 alle ore 17:46 Giampaolo Bellini ***@***.***> ha scritto: > Hi Shawn, > > that's a good point... I have a wired network too... I'm checking it > right now... > > Giampaolo > > Il giorno gio 27 mag 2021 alle ore 17:42 Shawn A ***@***.***> > ha scritto: > >> It has been awhile since I last used windows 10, have you disabled other >> network connections ? >> >> — >> You are receiving this because you commented. >> Reply to this email directly, view it on GitHub >> <https://github.com/tzapu/WiFiManager/issues/926#issuecomment-849738806>, >> or unsubscribe >> <https://github.com/notifications/unsubscribe-auth/AAODQQEBDM7YWZSDNEGRHJDTPZR4ZANCNFSM4IL7ZLHA> >> . >> >
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