SSL error dotnet build

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Hi all,
I've just started seeing this error on one of my boxes when building a net core Web api on Linux Ubuntu 20.04

It was working perfectly yesterday and still is on my other Linux boxes
I must have inadvertently changed something but I can't think what

dotnet publish -c Release -o /var/www/CommandsAPI/

Microsoft (R) Build Engine version 17.0.0-preview-21378-03+d592862ed for .NET
Copyright (C) Microsoft Corporation. All rights reserved.
Determining projects to restore...

/usr/share/dotnet/sdk/6.0.100-preview.7.21379.14/NuGet.targets(131,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json. [/mnt/Docker/Jenkins/jenkins/workspace/CommandsAPI/CommandsAPI.sln]
/usr/share/dotnet/sdk/6.0.100-preview.7.21379.14/NuGet.targets(131,5): error :   The SSL connection could not be established, see inner exception. [/mnt/Docker/Jenkins/jenkins/workspace/CommandsAPI/CommandsAPI.sln]
/usr/share/dotnet/sdk/6.0.100-preview.7.21379.14/NuGet.targets(131,5): error :   The remote certificate is invalid because of errors in the certificate chain: UntrustedRoot [/mnt/Docker/Jenkins/jenkins/workspace/CommandsAPI/CommandsAPI.sln]

What I have tried:

Hi all,
I've just started seeing this error on one of my boxes when building a net core Web api on Linux Ubuntu 20.04

It was working perfectly yesterday and still is on my other Linux boxes
I must have inadvertently changed something but I can't think what

dotnet publish -c Release -o /var/www/CommandsAPI/

Microsoft (R) Build Engine version 17.0.0-preview-21378-03+d592862ed for .NET
Copyright (C) Microsoft Corporation. All rights reserved.
Determining projects to restore...

/usr/share/dotnet/sdk/6.0.100-preview.7.21379.14/NuGet.targets(131,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json. [/mnt/Docker/Jenkins/jenkins/workspace/CommandsAPI/CommandsAPI.sln]
/usr/share/dotnet/sdk/6.0.100-preview.7.21379.14/NuGet.targets(131,5): error :   The SSL connection could not be established, see inner exception. [/mnt/Docker/Jenkins/jenkins/workspace/CommandsAPI/CommandsAPI.sln]
/usr/share/dotnet/sdk/6.0.100-preview.7.21379.14/NuGet.targets(131,5): error :   The remote certificate is invalid because of errors in the certificate chain: UntrustedRoot [/mnt/Docker/Jenkins/jenkins/workspace/CommandsAPI/CommandsAPI.sln]

Posted 3-Dec-21 23:48pm

pkfox

Updated 5-Dec-21 0:53am

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pkfox · Accepted Answer · 2021-12-05T00:53:00

Solution 1

Got around it by removing and reinstalling ca-certificates - not ideal but it worked

apt remove --purge -V ca-certificates
apt install ca-certificates -y

Posted 5-Dec-21 0:53am

pkfox