This one would have me tearing out my hair, if I had any.
We need to log in to a site from an advertising supplier. From within our office LAN I see the following ...
I have no issues logging in to this site from my desktop PC running XP, but my boss - who is the one who needs to log into this site, cannot.
On my boss's system, which is a Sony Vaio notebook, model VGN-SR240 ...
Initially, using Vista, unable to log in. This was a default Sony Vista installation.
I've upgraded the OS to Win7 Pro, but with no change in this result. This was a generic Win 7 installation, performed as an upgrade to the system.
Booting Ubuntu from a USB stick on that system, I have no issues logging in to the site in question. That outcome immediately eliminates the LAN and the hardware from being active players in this problem, and brings us back to the implementation of Windows.
The connection is using https; totally disabling the firewall has no effect on the outcomes.
Usin Wireshark, the only thing that I am seeing is that the TCP headers' checksums appear to not be matching. The only thing that I've been able to see that seems to be relevant for this is the registry setting
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DisableTaskOffload
I've set this to a dword with a value of 1, but again, no change in the outcomes.
Googling doesn't seem to be offering anything that seems, to me, to be a resolution.
Does anyone out there have any suggestions for me?
Perhaps specific network settings that Sony might impose upon their users within their Vista builds?
Thanks in advance for any and all suggestions.