ASP.NET Core
A set of technologies in the .NET Framework for building web applications and XML web services.
4,788 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(41.6, 12%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ER%3C/text%3E%3C/svg%3E)
This error still appears in version 17.3.2.
aspnetcore-browser-refresh.js:55 Unknown payload: { "type" : "Ping" }
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(262.40000000000003, 75%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHS%3C/text%3E%3C/svg%3E)
Hedelin Staffan
46
Reputation points
Visual Studio 2022 17.3.0 hot reload I get this error very often. Both in Edge (Version 100.0.1185.44 (Official build) (64-bit)) and Chrome (Version 104.0.5112.81 (Officiell version) (64 bitar))
Most irritating since it's not updating page after save.
asp.net core 6 MVC web project.
ASP.NET Core
Visual Studio
Visual Studio
A family of Microsoft suites of integrated development tools for building applications for Windows, the web and mobile devices.
5,447 questions
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(220.8, 24%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EST%3C/text%3E%3C/svg%3E)
Steffes, Timothy (T.) 0 Reputation points2023-08-14T14:32:55.3466667+00:00 I know this older, but I'm using VS Pro Version 17.6.5 and it is still happening.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(73.60000000000001, 90%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EZL%3C/text%3E%3C/svg%3E)
Zhi Lv - MSFT 32,986 Reputation points Microsoft Vendor2023-09-10T23:52:58.8966667+00:00 As you said, this is too older, I suggest you can create a new thread about this problem, and tell us your VS version, application version, browser version and the relates code to reproduce the problem, then it is easier for us to help you. Thanks for your understanding.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(70.4, 67%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETS%3C/text%3E%3C/svg%3E)
Timothy Steffes 0 Reputation points2023-09-11T13:58:12.89+00:00 VS Pro Version 17.6.5. Chrome Version 116.0.5845.180 (Official Build) (32-bit)
Reproducing the error is really easy
- Create a new project - ASP.NET Core Web App (MVC) / .NET 6 (LTS)
- Run the project (F5)
- In the browser, open Developer Tools (inspect, or F12)
- In Visual Studio, open site.js
- Add
console.log("Hello world!"); - Save
- Watch the console window closely as you save because the error message goes away very quickly because the page reloads
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(169.60000000000002, 41%, 26%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERH%3C/text%3E%3C/svg%3E)
Rob Harwood 0 Reputation points2025-02-20T20:42:41.2933333+00:00 This happens when debugging. When using dotnet watch this issue does not happen. The problem prevents hot reload working whilst debugging.
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8 answers
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(64, 82%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDM%3C/text%3E%3C/svg%3E)
Douglas Manter 16 Reputation points2022-10-13T20:15:58.013+00:00 Still an issue with 17.3.6 and not just with Hot reload.
It happens to me when a page redirects in a post.
aspnetcore-browser-refresh.js:55 Unknown payload: { "type" : "Ping" } -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(57.599999999999994, 37%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Максим Булавинов 11 Reputation points2022-10-03T12:49:01.127+00:00 Visual Studio version 17.3.5 - this error still appears.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(291.2, 74%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ENT%3C/text%3E%3C/svg%3E)
Nam Thanh 11 Reputation points2022-11-21T13:30:01.553+00:00 Still an issue with 17.4.1 and not just with Hot reload.
It happens when I leave the site alone for 5s, it makes me unable to do anything with my site
aspnetcore-browser-refresh.js:55 Unknown payload: { "type" : "Ping" } -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(268.8, 38%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJG%3C/text%3E%3C/svg%3E)
Jared G 5 Reputation points2023-09-14T18:22:04.9966667+00:00 This looks like an open issue with the aspnetcore project: https://github.com/dotnet/aspnetcore/issues/45041