I can't add cave

Here is a support article to help resolve the issue.

https://support.klei.com/hc/en-us/articles/4407489414548-Getting-a-Dedicated-Server-Failed-To-Start-Error-Message

You will know if the problem is your firewall or antivirus if you see the two lines in your server_log.txt file.

Quote

CURL ERROR: (dst.metrics.klei.com) Failed to connect to dst.metrics.klei.com port 443: Bad access
CURL ERROR: (login.kleientertainment.com) Failed to connect to login.kleientertainment.com port 443: Bad access

Please let me know if it helps you resolve the issue or does not help.

If you are having an issue after the article please upload your server_log.txt file here so we can look over it.