This is rather cosmetic of an issue and can be ignored. Certificate error means your Operating System is not validating the certificate presented by
https://cloud.otrs.com. As of this writing, that is RapidSSL, which should indeed be one of the trusted root certificate authorities. However, if your OS is old or not recently refreshed, it could be that the certificate revocation check could not be effectively performed, possibly because of outbound firewall restrictions (OTRS server can't call home anywhere).
You can:
1) Safely ignore this
2) Disable the Product News in SysConfig
3) Fix/troubleshoot DNS/Firewall/Certificate issues on the server.
OTRS 6.0.x (private/testing/public) on Linux with MySQL database.
Please
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OTRS version, Operating System, and database type.
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