Hey,

When setting socket.ssl = NO in wsrep_provider_options without explicitly specifying if SSL is used in the [SST] part of my.cnf, not only will the state transfer fail, but it will crash the donor node as well as the receiver node.

The respective parts of  my.cnf

Logs from the donor:

Logs of the receiver:

To us it looks like the cause is:

• When setting socket.ssl = NO, the donor does not expect SSL Traffic in state transfer connections.

• But unless explicitly configuring [SST] to not use SSL, it will use SSL.

• This makes sent/received packages unreadable for both ends

• This causes crashes on the donor and the receiver.

On a three node cluster, where

• Node 3 dropped out and tried to re-join with an automatic state transfer from Node 2

• Node 3 will crash and hang

• Node 2 will also crash and hang

• Node 1 will be left alone and therefore transition into Non-Primary.

How we would it expect to behave:

• Error handling on sender and receiver side

• Maybe even explicitly detecting misalignment on SSL-config and print an error hinting to this

• but definitely not crashing MySQL.