Intermittent cloud database connection failures with system log reporting "CURL ERROR: error signaled by ssl ctx callback"

• Unable to connect intermittently to the elected cloud server (Example: serverlist2.urlcloud.paloaltonetworks.com)
• system log (show log system) indicates Curl error

info     url-fil    cloud-e 0  CLOUD ELECTION: serverlist2.urlcloud.paloaltonetworks.com IP: 10.x.x.253 was elected, measured alive test 83542.
high     url-fil    url-clo 0  CURL ERROR: error signaled by ssl ctx callback

• Devsrv.log (less mp-log devsrv.log) too display the same error

 +0000 Cloud serverlist3.urlcloud.paloaltonetworks.com
 +0000 URL HTTPS://serverlist3.urlcloud.paloaltonetworks.com:443/hello2 IP 10.x.x.253
 +0000 Source IP 10.y.y.226
 +0000 name lookup time 0.000022 second
 +0000 connect time 0.006282 second
 +0000 ssl connect time 0.000000 second
 +0000 total time 0.014606 second
 +0000 server certificate chain: 0 certinfo(s)
 +0000 curl error: error signaled by ssl ctx callback   
 +0000 fail to set thermite client cert in pandb ssl ctx, fallback to use old client cert   
 +0000 sending alive request msg with len 192
 +0000 CLOUD_ELECTION: in wait_t 0 secs.

• Palo Alto Firewalls
• PAN-OS 10.1.10 or below; 10.2.5 or below
• URL Filtering

1. The issue has been addressed under PAN-216775  in PAN-OS 10.1.11, 10.2.6, 11.0.3 and 11.1.0.
2. Upgrade of the PAN-OS will resolve the issue.
3. If workaround is needed, contact Support and mention this knowledge article.