Slave Join problem

curl: (51) SSL: no alternative certificate subject name matches target host name 'ucs-sso.domain

Then 92univention-management-console-web-server.inst failed

ping ucs-sso
PING ucs-sso.domain (IP) 56(84) bytes of data.
64 bytes from ucs-sso.domain (IP): icmp_seq=1 ttl=64 time=0.269 m

How can i fix?
Regards

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