Error update sles 12 sp2

SUSE Linux Enterprise Server SLES Updates
1

saphephana:/etc/pki/trust/anchors # zypper update
Refreshing service ‘SUSE_Linux_Enterprise_Server_for_SAP_Applications_12_SP2_x86_64’.
Refreshing service ‘SUSE_Linux_Enterprise_Server_for_SAP_Applications_12_SP4_x86_64’.
Retrieving repository ‘SLE-12-SP2-SAP-Updates’ metadata -------------------------------------------------------------------------------------------------------------------------------------[\]
Download (curl) error for ‘https://updates.suse.com/SUSE/Updates/SLE-SAP/12-SP2/x86_64/update/repodata/repomd.xml?I_nr2KnzHf5NH5jdblij7MgnMqSRjjKYG2Hau3YH-j-VB0OxzrFtCA4nTQTA48DQi6ku25sdi33jSslI0W2rjbKadc-HS6h0QdWxg895EZUf5vGsNNpgqDQy6hErd_gIsNJYjUaV8kk’:
Error code: Curl error 60
Error message: SSL certificate problem: unable to get local issuer certificate

Abort, retry, ignore? [a/r/i/? shows all options] (a):

2

Have you previously been able to run “zypper update”?

Is time synchronised?

Are you using a HTTP proxy?

HTH,
Simon