fixing cannot get required symbol SSL_set_alpn_protos from libssl

Andrus 121

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

Zhi Lv - MSFT 32,106 Reputation points Microsoft Vendor

2023-02-27T02:11:26.9633333+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).
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 ?
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 ?
Zhi Lv - MSFT 32,106 Reputation points Microsoft Vendor

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.
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?
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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fixing cannot get required symbol SSL_set_alpn_protos from libssl