Recently we've got this security alert in English:
Security Alertand the same in Chinese:
The file you are uploading was rejected by the server.
It probably contents viruses or trojans that can damage your website
Do not attempt to upload it again as your IP address may be blocked.
安全警报It showed up every time, when someone tried to post a new answer, to open a new thread, to edit his/her profile...And then we contacted to our hosting. They were so nice to answer soon and to fix the problem. Thank them very much!
We're sorry for the inconvenience, dear forum members, users, readers, friends!