Not able to set up Azure AD B2C on .NET Web Forms

Question

I'm currently not able to set up Azure AD B2C on .NET Web Forms

I could set up in MVC or .NET Core in no more than 5 minutes but we have a legacy and I can't do this in another tech.

I have followed this reference and just changed to my current config and got 500 error, once I click sign up or sign in buttons.

    <add key="ida:Tenant" value="aicdb2c.onmicrosoft.com" />
    <add key="ida:ClientId" value="{applicationId}" />
    <add key="ida:AadInstance" value="https://login.microsoftonline.com/{0}/v2.0/.well-known/openid-configuration?p={1}" />
    <add key="ida:RedirectUri" value="http://localhost:58851/" />
    <add key="ida:SignUpPolicyId" value="B2C_1_sign_up" />
    <add key="ida:SignInPolicyId" value="B2C_1_sign_in" />
    <add key="ida:UserProfilePolicyId" value="B2C_1_edit_profile" />

The message error is not helpful. It's just a generic message: "The page cannot be displayed because an internal server error has occurred".

After getting this message, if I hit enter in the address bar (http://localhost:58851/), I can access the page normally. Otherwise, I just get a blank page with this message.

I have Googled a lot and no luck.

I appreciate any help.

Answer 1

Hi @saurabh sharma ,

Thanks for the help.

I found what was causing the issue.

The reference from GitHub is 3 years old and the ida:AadInstance was no longer valid.

It should be like the following:

<add key="ida:AadInstance" value="https://aicdb2c.b2clogin.com/{0}/{1}/v2.0/.well-known/openid-configuration" />  

Please note that you should change aicdb2c to your name / domain.

Answer 2

Hi @Saurabh Sharma

Console:

Network:

HAR file:
{
"log": {
"version": "1.2",
"creator": {
"name": "WebInspector",
"version": "537.36"
},
"pages": [
{
"startedDateTime": "2020-06-03T00:15:55.821Z",
"id": "page_1",
"title": "http://localhost:58851/",
"pageTimings": {
"onContentLoad": 1242.8700000746176,
"onLoad": 1438.4870000649244
}
}
],
"entries": [
{
"startedDateTime": "2020-06-03T00:15:55.819Z",
"time": 1054.2170000262558,
"request": {
"method": "POST",
"url": "http://localhost:58851/",
"httpVersion": "HTTP/1.1",
"headers": [
{
"name": "Host",
"value": "localhost:58851"
},
{
"name": "Connection",
"value": "keep-alive"
},
{
"name": "Content-Length",
"value": "414"
},
{
"name": "Cache-Control",
"value": "max-age=0"
},
{
"name": "Upgrade-Insecure-Requests",
"value": "1"
},
{
"name": "Origin",
"value": "http://localhost:58851"
},
{
"name": "Content-Type",
"value": "application/x-www-form-urlencoded"
},
{
"name": "User-Agent",
"value": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36"
},
{
"name": "Accept",
"value": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.9"
},
{
"name": "Sec-Fetch-Site",
"value": "same-origin"
},
{
"name": "Sec-Fetch-Mode",
"value": "navigate"
},
{
"name": "Sec-Fetch-User",
"value": "?1"
},
{
"name": "Sec-Fetch-Dest",
"value": "document"
},
{
"name": "Referer",
"value": "http://localhost:58851/"
},
{
"name": "Accept-Encoding",
"value": "gzip, deflate, br"
},
{
"name": "Accept-Language",
"value": "en-AU,en;q=0.9,pt-BR;q=0.8,pt;q=0.7"
},
{
"name": "Cookie",
"value": ".AspNetCore.Antiforgery.-qL_f1LO0ZA=CfDJ8DEVO1hfMPxDkNcXD1hM-gJKXXWstDFy809mzhZBQ3MBJqhlwkRZDKuhXP1K9zmoYZN5I3cyG5tArgbEm5bhVmG8ZVYVKktKVDMPbEsq6VgddCKgPfTGCxxGwE52IunkhsmqzfNGvAYP2V5J9DCqQ2g; ASP.NET_SessionId=xrdmgd3t2c2dgpgytxef2k0s"
}
],
"queryString": [],
"cookies": [
{
"name": ".AspNetCore.Antiforgery.-qL_f1LO0ZA",
"value": "CfDJ8DEVO1hfMPxDkNcXD1hM-gJKXXWstDFy809mzhZBQ3MBJqhlwkRZDKuhXP1K9zmoYZN5I3cyG5tArgbEm5bhVmG8ZVYVKktKVDMPbEsq6VgddCKgPfTGCxxGwE52IunkhsmqzfNGvAYP2V5J9DCqQ2g",
"expires": null,
"httpOnly": false,
"secure": false
},
{
"name": "ASP.NET_SessionId",
"value": "xrdmgd3t2c2dgpgytxef2k0s",
"expires": null,
"httpOnly": false,
"secure": false
}
],
"headersSize": 954,
"bodySize": 414,
"postData": {
"mimeType": "application/x-www-form-urlencoded",
"text": "__EVENTTARGET=ctl00%24Account1%24linkSignUp&__EVENTARGUMENT=&__VIEWSTATE=Xl4ldmCTo%2BNZIU9AxOt2%2BQYGnK6cBZ0t7CnRRvrMJkjWxe1%2Fqb5vIUhju%2Bp901Rmu%2FpM%2B9FwZDfvu0%2FvvM7IbC%2FWS6QhQOwPevwxPi1G2Yw%3D&__VIEWSTATEGENERATOR=CA0B0334&__EVENTVALIDATION=NNoQu4SN39n8vQzgQTJZovzr9zjPem4XpZwUphM5culOHn%2B3jvonvbGFW1ez3607cey7O%2BKWDGU%2BSBfEhwPbeTWb0r8LUpyp5obfMCPZaN%2F5hRwhwNiqEwL1yFU2%2B4jcc2SJUxJcTXTgOrx6oqohGA%3D%3D",
"params": [
{
"name": "__EVENTTARGET",
"value": "ctl00%24Account1%24linkSignUp"
},
{
"name": "__EVENTARGUMENT",
"value": ""
},
{
"name": "__VIEWSTATE",
"value": "Xl4ldmCTo%2BNZIU9AxOt2%2BQYGnK6cBZ0t7CnRRvrMJkjWxe1%2Fqb5vIUhju%2Bp901Rmu%2FpM%2B9FwZDfvu0%2FvvM7IbC%2FWS6QhQOwPevwxPi1G2Yw%3D"
},
{
"name": "__VIEWSTATEGENERATOR",
"value": "CA0B0334"
},
{
"name": "__EVENTVALIDATION",
"value": "NNoQu4SN39n8vQzgQTJZovzr9zjPem4XpZwUphM5culOHn%2B3jvonvbGFW1ez3607cey7O%2BKWDGU%2BSBfEhwPbeTWb0r8LUpyp5obfMCPZaN%2F5hRwhwNiqEwL1yFU2%2B4jcc2SJUxJcTXTgOrx6oqohGA%3D%3D"
}
]
}
},
"response": {
"status": 500,
"statusText": "Internal Server Error",
"httpVersion": "HTTP/1.1",
"headers": [
{
"name": "Cache-Control",
"value": "private"
},
{
"name": "Content-Type",
"value": "text/html"
},
{
"name": "Server",
"value": "Microsoft-IIS/10.0"
},
{
"name": "X-AspNet-Version",
"value": "4.0.30319"
},
{
"name": "X-SourceFiles",
"value": "=?UTF-8?B?QzpcVXNlcnNcYWxsZXhcRG93bmxvYWRzXEIyQy1XZWJGb3Jtcy1Eb3ROZXRcQjJDLVdlYkZvcm1zXGRlZmF1bHQuYXNweA==?="
},
{
"name": "X-Powered-By",
"value": "ASP.NET"
},
{
"name": "Date",
"value": "Wed, 03 Jun 2020 00:15:56 GMT"
},
{
"name": "Content-Length",
"value": "75"
}
],
"cookies": [],
"content": {
"size": 75,
"mimeType": "text/html",
"compression": 0,
"text": "The page cannot be displayed because an internal server error has occurred."
},
"redirectURL": "",
"headersSize": 349,
"bodySize": 75,
"_transferSize": 424
},
"cache": {},
"timings": {
"blocked": 2.518000010214746,
"dns": -1,
"ssl": -1,
"connect": -1,
"send": 0.139,
"wait": 1049.419000011556,
"receive": 2.1410000044852495,
"_blocked_queueing": 1.943000010214746
},
"serverIPAddress": "[::1]",
"_initiator": {
"type": "other"
},
"_priority": "VeryHigh",
"_resourceType": "document",
"connection": "29084",
"pageref": "page_1"
}
]
}
}

Thanks for your help.

Answer 3

@Allex Rocha - I have able to run your provided sample. There are few changes you need to make -

1. Instead of using http you need to use "https" for application redirect URI in web.config file -
   <add key="ida:RedirectUri" value="https://localhost:58854/" /> Please make sure to provide a different port number than used by http. Here I have changed it to 58854
2. You need to update the same in the registered application on Azure portal -
   
3. You also need to update "Project Url" in Visual Studio project to use the new https url as shown below -

Here is the result which I can see with the changes -

Please let me know if any other questions.