Error downloading agent installers from 6.5

[mgargiullo 0]

Server Info:

ESET Remote Administrator (Server), Version 6.5 (6.5.417.0)
ESET Remote Administrator (Web Console), Version 6.5 (6.5.388.0)

CentOS (64-bit), Version 6.9

When I attempt to download agent live installers (all OSs), my console just  shows a timeout and this error appears in the last-error.html file in /var/log/eset/RemoteAdministrator/Server

Unexpected error while processing OnlineInstallers request: Response for request of type OnlineInstallersRequest (request id: 5338) was not received in time

Any idea why I can't download installers, even if I just finished creating them?