Management: Status: Firmware cURL error 28 (timeout) after Update to 26.1.5

[SchengFui]

Hi There,

after Update from Version 25.7.11_9 to 26.1.5 Firmwarecheck via Management no longer works.

A new API-key has been generated without any effect.

Firmware-Check on other, not updated OPNSense works as expected.

Maybe it is VPN-related, the affected OPNSenses are connected via OpenVPN Site-to-Site.

Any ideas where to look next?

Thank you,
 SchengFui