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How to Fix SSL Certificate Verify Failed on Linux / Arch

How to Fix “SSL Certificate Verify Failed” on Linux / Arch

Quick fix for ETCMCv2 client connection issues on Linux systems when Python cannot find the correct trusted certificate bundle.

Typical error: SSL: CERTIFICATE_VERIFY_FAILED
Common message: unable to get local issuer certificate

1) What this error means 2) Why this happens 3) Quick fix 4) Step-by-step commands 5) How to verify the fix 6) Important notes

1) What this error means

If the ETCMCv2 client fails with an SSL certificate verification error, it usually means the client can reach the server, but Python does not know which trusted certificate store it should use on that machine.

Typical symptoms:

Client starts normally
Connection to the ETCMCv2 service fails
WebSocket or HTTPS requests return SSL verification errors
Browser or curl may still work normally

In simple terms: the server is reachable, but the Python runtime on that Linux system cannot find the correct CA certificate bundle automatically.

2) Why this happens

On some Linux systems, especially custom or minimal setups, Python may not automatically pick the correct certificate bundle path for SSL verification.

That can lead to errors like:

SSL: CERTIFICATE_VERIFY_FAILED
certificate verify failed: unable to get local issuer certificate

This does not always mean:

the ETCMCv2 server is down
Cloudflare is broken
the certificate is invalid

It often means:

Python is using the wrong CA path
the CA bundle path is not set
the client environment needs the system certificate file explicitly defined

3) Quick fix

Set the system CA certificate bundle manually before starting the ETCMCv2 client:

export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt

After that, launch the ETCMCv2 client from the same terminal session.

This forces Python and related libraries to use the Linux system certificate bundle for SSL verification.

4) Step-by-step commands

Open a terminal in your ETCMCv2 client folder and run:

export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
./ETCMC_GETH

If your client uses another launcher or Python file, start that instead after exporting the variables.

Example:

cd /path/to/your/etcmcv2-client
export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
./ETCMC_GETH

If you start the client with Python directly, use:

export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
python your_client_file.py

5) How to verify the fix

After setting the variables and starting the client again:

Launch the ETCMCv2 client from the same terminal
Wait for the connection step
Check whether the SSL error is gone
Confirm the client connects to the WebSocket / API normally

If the fix works, the client should:

connect without certificate verification errors
fetch server data normally
continue WebSocket communication successfully

6) Important notes

These export commands only apply to the current terminal session. If you open a new terminal later, you must run them again before starting the client.

If you want this to be permanent, you can add the same exports to your shell profile, for example:

~/.bashrc
~/.zshrc

Then add:

export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt

This issue is usually local to the Linux environment and does not necessarily indicate a server-side problem.

Summary:

The ETCMCv2 endpoint is reachable
The certificate is valid
The local Python environment was not using the correct CA bundle path
Setting the certificate bundle manually fixes the issue

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