TLS or SSL level used with 2.9.5

[Ant]

I'm using the MOD5541X to connect securely to a server using SSL_connect with Netburner 2.9.5.

The parameters used to work with the old server, but the provider has moved it over to Kubernetes and the connection fails now:

int fds = SSL_connect(ipadd, 0, NV_Settings.nAPIDestPort, TICKS_PER_SECOND * 120,NULL);

if (fds <= 0)
{
close(fds);
switch (fds)
{
case SSL_ERROR_FAILED_NEGOTIATION:
{
iprintf(" SSL_ERROR_FAILED_NEGOTIATION \r\n"); //-256
break;
}

I keep getting -256 as the return value.

The new server has TLSv1.2 and v1.3 enabled, but I can't find in the Netburner documentation what level is possible using 2.9.5 ?

[TomNB]

Hello,

The default for 2.9.5 is TLS 1.2. The error message you indicate is negotiation failed, so it must be for some other reason. A wireshark trace might help. It might be a good idea to work directly with our SSL/TLS engineers with a support ticket.

[Ant]

Thanks for the clarification.
I never managed to figure out how to do a Wireshark trace of packets between the Netburner and the external server using my Windows PC.
In the end I upgraded to 3.4.0 and the connection now works again.
I guess something got fixed in one of the upgrades, but it's all good now.

[TomNB]

In 3.4 it supports both TLS 1.2 and 1.3 by default. I think that might be what made it work.

[TomNB]

Thanks for getting back to the forum and reporting that. Might help others.