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fixing cannot get required symbol SSL_set_alpn_protos from libssl
![](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(288, 77%, 37%)' 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)
Andrus
121
Reputation points
ASP .NET 7.0.103 MVC application is deployed to Debian Linux 8.11 (jessie). Kestrel server with Apache proxy is used.
Publish settings in latest Visual Studio are:
Trying to run it in Linux throws error
Cannot get required symbol SSL_set_alpn_protos from libssl
How to run .NET 7.0.103 application in Debian Jessie ?
.NET 6 application runs OK.
[1]: https://i.stack.imgur.com/3ws0m.png
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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(128, 8%, 22%)' 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)
Anonymous2023-02-27T02:11:26.9633333+00:00 Hi @Andrus
The issue might relate the .Net 7 image, try to use the official .NET 7 image instead of installing the .NET 7 SDK: mcr.microsoft.com/dotnet/sdk:7.0.
Refer to this thread: Cannot get required symbol SSL_set_alpn_protos from libssl" when installing trx2junit (.NET 7).
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Andrus 121 Reputation points
2023-02-27T07:42:35.9233333+00:00 Selft-contined Deployment Mode with .NET 7.0.103 SDK is used in latest Visual Studio:
How to use official .NET image ?
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Andrus 121 Reputation points
2023-02-27T07:46:45.1966667+00:00 Application is published in Windows 11 using latest Visual Studio self-contained Deployment Mode with .NET 7.0.103 SDK installed from .NET downloads page. Target is linux-x64.
How to use official .NET image ?
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Anonymous
2023-02-27T09:02:08.9033333+00:00 Hi @Andrus
It is a docker image, I thought you were publishing an application through a docker container. Refer to the following articles: Docker images for ASP.NET Core. Besides, you can also refer to this article to publish application to linux: Host ASP.NET Core on Linux with Nginx.
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Andrus 121 Reputation points
2023-02-27T09:14:08.8933333+00:00 Hi!
I dont use docker. Application is published in self-contained mode from Visual Studio IDE to folder and copied them to Debian server using FTP. This is as described in your link https://learn.microsoft.com/en-us/aspnet/core/host-and-deploy/linux-nginx?view=aspnetcore-7.0&tabs=linux-ubuntu
It worked when .NET 6 was used. After upgrading Visual Studio to latest version and then reverting back to .NET 7.0.103 runtime using global. json
{ "sdk": { "version": "7.0.103", "rollForward": "disable" } }running in Debian throws error
cannot get required symbol SSL_set_alpn_protos from libssl
Can you be more specific, how to publish properly?
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Andrus 121 Reputation points
2023-02-27T10:51:06.0333333+00:00 If deployed to Debian 12.2 application works. Debian 8 + .NET 6 also works. It seems to occur in Debian 8 + .NET 7.
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