- Cisco VPN client mysteriously stops working under Windows 8 -- symptoms:
- - connection appears successful
- - connection dialogue can still tell the difference between a right & wrong
- password, so authentication is working
- - network stats shows packets being sent and encrypted successfully, but 0
- received / 0 decrypted
- - enabling the debug log shows corrupted IKE packets received with "invalid
- version (random version number)"; messages like:
- Sev=Warning/3 IKE/0xE300002C
- ISAKMP header invalid: Invalid version 10.14 found
- Solution: this happens when "Fast startup" is enabled (which does a partial
- hibernate rather than a real shutdown / startup); if the VPN driver is
- connected at shutdown, it gets confused next startup. Disable fast startup:
- Power options > "change what closing the lid does" > enable options not
- currently available (link at the top) > "enable fast startup" (checkbox at the
- bottom).
- Then do a full shutdown and cold start.
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