Where does this error appear?
What does your logfile say?
Whats your hardware ressource configuration on your Host?
Side note: Please note that Zammad 3.1 is depreacted and there were important security updates introduced with Zammad 3.3 - you might want to consider upgrading.
This is the same with ours. we encounter this. just now. how can we upgrade to zammad3.3. I got this error: W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://dl.yarnpkg.com/debian stable InRelease: The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging yarn@dan.cx
W: Failed to fetch https://dl.yarnpkg.com/debian/dists/stable/InRelease The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging yarn@dan.cx
W: Some index files failed to download. They have been ignored, or old ones used instead.
I follow this instructions: W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://dl.yarnpkg.com/debian stable InRelease: The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging yarn@dan.cx
W: Failed to fetch https://dl.yarnpkg.com/debian/dists/stable/InRelease The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging yarn@dan.cx
W: Some index files failed to download. They have been ignored, or old ones used instead.
Hope to hear from you. because now it is totally down.
The error you mentioned is an issue with your package manager where I can’t help sorry, that’s out of scope.
Beside, I don’t understand what you mean by “It’s down” (that’s not an error message that helps to help you). The above errors suggest that you couldn’t upgrade Zammad at all.