After an upgrade of the server a few days ago I overlooked a small detail in the security settings which prevented that the daily updates could be downloaded correctly.
That in the end has lead to numerous cheat messages and bans in the past 2 days.
The problem meanwhile is fixed and all banned accounts have been unbanned.
In theory everything should be fine again.
The original upgrades were done to improve the security and performance of the Portal. There should be a small speed boost when fetching data from the server.