SAN certificates not working (socat)

When using SAN certificates, the marabackup dump fails with:

E certificate is valid but its commonName does not match hostname

But on SAN certificates, the cn filed must be ignored and the SAN section of the cert must checked.

So

[sst]

encrypt=3

sst-syslog=1

tcert=PATH

tkey=PATH

Will work, but without verification.
But

[sst]

encrypt=3

sst-syslog=1

tcert=PATH

tkey=PATH

tca=PATH

fails.
So the only chance is to disable verification.