No usable version of libssl was found

[Jdbye]

Following the Linux instructions, there is no mention of any dependencies needing to be installed.
I manually installed libssl3 and libssl-dev with apt, but still, no dice.
I also had to chmod +x the binary before it would even try to run, this was not mentioned in the instructions either.

./Requestrr.WebApi
No usable version of libssl was found
Aborted (core dumped)

[Jdbye]

Solved by downloading and building OpenSSL 1.1.1 manually.
It starts now, but there is still an SSL issue once I configure the Discord bot.
Aug 09 00:15:15 me Requestrr.WebApi[280969]: [2023-08-09 00:15:15 +02:00] [112 /RestError ] [Error] Request to https://discord.com/api/v9/gateway/bot triggered an HttpException Aug 09 00:15:15 me Requestrr.WebApi[280969]: System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception. Aug 09 00:15:15 me Requestrr.WebApi[280969]: ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid because of errors in the certificate chain: PartialChain Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Security.SslStream.SendAuthResetSignal(ProtocolToken message, ExceptionDispatchInfo exception) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](TIOAdapter adapter, Boolean receiveFirst, Byte[] reAuthenticationData, Boolean isApm) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Boolean async, Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: --- End of inner exception stack trace --- Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Boolean async, Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpClient.SendAsyncCore(HttpRequestMessage request, HttpCompletionOption completionOption, Boolean async, Boolean emitTelemetryStartStop, CancellationToken cancellation> Aug 09 00:15:15 me Requestrr.WebApi[280969]: at DSharpPlus.Net.RestClient.ExecuteRequestAsync(BaseRestRequest request, RateLimitBucket bucket, TaskCompletionSource'1 ratelimitTcs) Aug 09 00:15:15 me Requestrr.WebApi[280969]: [2023-08-09 00:15:15 +02:00] [102 /ConnectionFa] [Error] Connection attempt failed, retrying in 60s Aug 09 00:15:15 me Requestrr.WebApi[280969]: System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception. Aug 09 00:15:15 me Requestrr.WebApi[280969]: ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid because of errors in the certificate chain: PartialChain Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Security.SslStream.SendAuthResetSignal(ProtocolToken message, ExceptionDispatchInfo exception) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](TIOAdapter adapter, Boolean receiveFirst, Byte[] reAuthenticationData, Boolean isApm) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Boolean async, Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: --- End of inner exception stack trace --- Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Boolean async, Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at System.Net.Http.HttpClient.SendAsyncCore(HttpRequestMessage request, HttpCompletionOption completionOption, Boolean async, Boolean emitTelemetryStartStop, CancellationToken cancellation> Aug 09 00:15:15 me Requestrr.WebApi[280969]: at DSharpPlus.Net.RestClient.ExecuteRequestAsync(BaseRestRequest request, RateLimitBucket bucket, TaskCompletionSource'1 ratelimitTcs) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at DSharpPlus.Net.DiscordApiClient.GetGatewayInfoAsync() Aug 09 00:15:15 me Requestrr.WebApi[280969]: at DSharpPlus.BaseDiscordClient.GetGatewayInfoAsync(String token) Aug 09 00:15:15 me Requestrr.WebApi[280969]: at DSharpPlus.DiscordClient.InternalUpdateGatewayAsync() Aug 09 00:15:15 me Requestrr.WebApi[280969]: at DSharpPlus.DiscordClient.InternalConnectAsync() Aug 09 00:15:15 me Requestrr.WebApi[280969]: at DSharpPlus.DiscordClient.ConnectAsync(DiscordActivity activity, Nullable'1 status, Nullable'1 idlesince)

[Jdbye]

In the end found a .deb package on Ubuntu's archive for libssl 1.1.1f which seems to work correctly.

[N4GR]

In the end found a .deb package on Ubuntu's archive for libssl 1.1.1f which seems to work correctly.

I can confirm this solution works, I was having troubles launching the ./Requestrr.WebApi from an Ubuntu LTS v22.04.3 Server because the only available LibSSL package is LibSSL3 and no previous versions.

Installing a LibSSL1.1.1f debian package for Ubuntu 20.04 Focal LTS worked for me despite being on v22 Jammy.

libssl1.1_1.1.1f-1ubuntu2_amd64.deb