Getting System.Net.Quic is not supported on this platform on Linux

[kamranattari4192]

Hi,
I am trying to run a .NET 7 application on CentOS7. It is always giving following error:
System.Net.Quic is not supported on this platform
I have installed libmsquic.
On another CentOS7 VM, the same code is working. What could be the issue on first VM. How can I diagnose the root cause of this issue?

[ManickaP]

You can turn on internal diagnostics for S.N.Quic: "Private.InternalDiagnostics.System.Net.Quic". For example, you can do that programmatically like this https://gist.github.com/ManickaP/864c3ee9c854db58db9ad6d54957d947, just change the eventSource.Name to "Private.InternalDiagnostics.System.Net.Quic" here https://gist.github.com/ManickaP/864c3ee9c854db58db9ad6d54957d947#file-http_test_logging-cs-L14.

If that doesn't show anything meaningful, the app cannot find and load libmsquic.so. So first step would be to locate it: ldconfig -p | grep libmsquic. Then you can check if it can be loaded: ldd /usr/lib/libmsquic.so.2.

In the end one of these cases will be the culprit:

• it's not actually installed in the system
• it's installed, but some of the dependencies are missing and/or are incompatible (there were some issues in this area)
• it's installed, but it's too old version that is incompatible with .NET 7

[nibanks]

@ManickaP this seems like something perfect to copy into your TSG.

[kamranattari4192]

Hi,

Thanks for your reply. I deleted my new CentOS 7 VM and tried with following steps:

1. Installed new RHEL 7.8
2. Installed libmsquic
3. Installed dotnet 7
4. Run my test application that uses MsQuic, it worked.
5. However, when I run ldconfig -p | grep libmsquic, it shows nothing.
6. When I run ldd /usr/lib/libmsquic.so.2, it shows me this error ldd: /usr/lib/libmsquic.so.2: No such file or directory. But MsQuic is working fine.
7. Then I tried this ldd /lib64/libmsquic.so.2, it shows me followings;
   linux-vdso.so.1 => (0x00007ffcaf37d000)
   libcrypto.so.1.1 => /lib64/libcrypto.so.1.1 (0x00007f2ba62ee000)
   libdl.so.2 => /lib64/libdl.so.2 (0x00007f2ba60ea000)
   libnuma.so.1 => /lib64/libnuma.so.1 (0x00007f2ba5ede000)
   libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f2ba5cc2000)
   libc.so.6 => /lib64/libc.so.6 (0x00007f2ba58f4000)
   libz.so.1 => /lib64/libz.so.1 (0x00007f2ba56de000)
   /lib64/ld-linux-x86-64.so.2 (0x00007f2ba67ca000)
   libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f2ba54c8000)
8. On this VM when I run openssl version it shows this OpenSSL 1.0.2k-fips 26 Jan 2017

On my other old VM which is CentOS 7, on this VM too MsQuic is working. On this VM when I run ldconfig -p | grep libmsquic, it shows following:
libmsquic.so.2 (libc6,x86-64) => /lib64/libmsquic.so.2
libmsquic.lttng.so.2.2.1 (libc6,x86-64) => /lib64/libmsquic.lttng.so.2.2.1
When I run ldd /usr/lib/libmsquic.so.2, it shows me this error ldd: /usr/lib/libmsquic.so.2: No such file or directory.
Then I tried this ldd /lib64/libmsquic.so.2, it shows me followings;

linux-vdso.so.1 => (0x00007ffeac673000)
libcrypto.so.1.1 => /lib64/libcrypto.so.1.1 (0x00007fdfa6fb3000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fdfa6daf000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fdfa6b93000)
libc.so.6 => /lib64/libc.so.6 (0x00007fdfa67c6000)
libz.so.1 => /lib64/libz.so.1 (0x00007fdfa65b0000)
/lib64/ld-linux-x86-64.so.2 (0x00007fdfa7497000)

I have another question, this link https://github.com/microsoft/msquic/blob/main/docs/Platforms.md describes that libmsquic requires Openssl 1.1, however, on my VMs as you can see above, it is also working with OpenSSL 1.0.2k-fips, or when I install libmsquic, it also installs Opensll 1.1 itself, is it correct?

[ManickaP]

The ldd command needs to be run with your location of libmsquic, so in your case /lib64/..., my example used location on my machine.
As you can see the output of ldd, there is libcrypto 1.1 and that's what msquic needs. So it runs. The requirements mention OpenSSL 1.1, because that's the package that carries libcrypto 1.1.

And just FYI, CentOS 7 is rather old and will not be supported by .NET 8.