The following error occurs using Maxscale 2.5.6 after an upgrade. They did not occur when using maxscale 2.4.11.
(tlsv1 alert internal error):
2021-01-11 17:13:16 error : (13) SSL operation failed, Client DCB in state DCB::State::POLLING fd 35 return code 0. More details may follow.
2021-01-11 17:13:16 error : (13) error:14094438:SSL routines:ssl3_read_bytes:tlsv1 alert internal error
2021-01-11 17:13:16 info : Stopped ext1-db01-service client session 
After upgrading to Maxscale 2.5.8 the errors stop, but after about 30 minutes they start again.
They are using are using OpenSSL 1.0.2k-fips 26 Jan 2017 on all systems (Client, Maxscale; DB)
OS: centos-release-7-9.2009.1.el7.centos.x86_64 with openssl-Version 1.0.2k-21.el7_9