I have 2 Plesk boxes with 1&1 in the UK (hosted in Germany i think). Anyway, one is running 7.5.4 and the other 8.01. The 8.01 box is new, and only has 2 domains on it at the moment. I have just received an invoice from 1&1 stating that my 8.01 box has transferred 4.7Gb of data in 1 month. If I look in Plesk, it states a grand total for the 2 domains at 17.85Mb. I have emailed 1&1 and am still awaiting a response, but their help system suggests that hacking attempts could account for high data transfer. Heres the question. I have configured my 1&1 Cisco firewall, I have checked my LogWatch emails and I cannot account where this large amount of data transfer is coming from. 1&1's policy is to slow down a server from 100Mb to 10Mb after 1Gb of data transfer. My 7.5.4 box is not suffering this problem. Can anyone offer any suggestions as to how best hide a server from hackers, and how to best lock down the security so that I do not keep suffering from this problem. My firewall is configured to allow ports : 80, 443, 25, 110, 143, 465, 993, 995, 8443, 21, 123, 53 and 22 (22 is allowed only from a particular IP address). Thank you.