Wifi issues after upgrade from 2.6.1 to 2.9.1: Certificate verification failed

[Ladivin]

Dear DevZone,

We've encountered yet another Wi-Fi related issue after upgrading from SDK version 2.6.1 to 2.9.1. Our code is based on your HTTPS client. When calling connect() function, occasionally we get "TLS handshake error: -0x2700" message followed by connect returning 113. In modules\crypto\mbedtls\include\mbedtls\x509.h I can see that 0x2700 means "Certificate verification error". There were no changes to any certificate on client or server side since our 2.6.1 version, so this really puzzles me. Could you please help us debugging this?

Thanks,

Ladivin 

[dejans]

Hi,

You could try to use new CA certificate as shown in this pull request.

Best regards,
Dejan

[Ladivin]

Hi Dejans,

we're using a custom certificate and a custom server, so this change shouldn't impact us. I'm sorry - I should have mentioned that before. 

Thanks,

Ladivin

[dejans]

Hi,

When calling connect() function, occasionally we get "TLS handshake error: -0x2700" message followed by connect returning 113.

Is it that there are sometimes no problems when you try to connect?

How often is occasionally? Is there anything that might trigger this issue that you are aware of?

Is the issue reproducible on your end?

Can you provide complete error log?

Best regards,
Dejan