I have a very strange issue with a 2008 server I first noticed this problem when Mozy backup which is used for some files stopped working. I then found I could not reach any ssl site or even the internal interface of my sonicwall. I have run wireshark and found 443 bound to the system process. When I try and access a ssl site I can see a SYN going out to 443 then ,a return SYN with: Header checksum: 0x0000 [incorrect, should be 0x2dec] RST packet and so on. I have been trying to identify what on the server is causing this conflict. Any Ideas?