Found the error message in the browser. Press F12 in Chrome and wait until the request is sent.
Request:
Response:
{
"zarafa": {
"reminderlistmodule": {
"reminderlistmodule19": {
"error": {
"type": 1,
"info": {
"hresult": 2147942487,
"title": null,
"hresult_name": "MAPI_E_INVALID_PARAMETER",
"file": "class.reminderlistmodule.php:246",
"display_message": "Could not load the contents of this folder. (null) (An invalid parameter was passed to a function or remote procedure call)",
"details_message": ""
}
}
}
}
}
}
I don't know what zarafa have to do with this. Presumably a historical development.
Perhaps this line from /var/log/nginx/nginx-web-error.log is part of the problem.
2025/07/25 09:04:48 [error] 1834#1834: *5070 FastCGI sent in stderr: "PHP message: getLocalFreeBusyMessage: unhandled MAPIException An invalid parameter was passed to a function or remote procedure call" while reading response header from upstream, client: 87.191.207.113, server: _, request: "POST /web/grommunio.php?subsystem=webapp_1753427088729 HTTP/2.0", upstream: "fastcgi://unix:/run/php-fpm/php-grommunio-web-fpm.sock:", host: "mail.businesstux.net"
