Problem:
While testing the Meraki Client VPN feature I noticed what I can only assume is a bug in Windows 10 (I am on 1803).
When selecting the Connect option from the WIFI/Network icon in the system tray, the connection would often hang in a “Connecting” state.
Looking in the Meraki event log I would get the below;
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1 2 3 4 5 6 7 |
Oct 22 10:31:48 Non-Meraki / Client VPN negotiation msg: failed to begin ipsec sa negotiation. Oct 22 10:31:48 Non-Meraki / Client VPN negotiation msg: no configuration found for x.x.x.x. Oct 22 10:31:24 Non-Meraki / Client VPN negotiation msg: IPsec-SA established: ESP/Transport x.x.x.x[4500]->82.7.39.246[4500] spi=2174933844(0x81a2db54) Oct 22 10:31:24 Non-Meraki / Client VPN negotiation msg: IPsec-SA established: ESP/Transport x.x.x.x[4500]->82.7.39.246[4500] spi=190939951(0xb61832f) Oct 22 10:31:24 Non-Meraki / Client VPN negotiation msg: ISAKMP-SA established x.x.x.x[4500]-x.x.x.x[4500] spi:2fcc04ff9ff90469:779439138b14820c Oct 22 10:31:24 Non-Meraki / Client VPN negotiation msg: invalid DH group 19. Oct 22 10:31:24 Non-Meraki / Client VPN negotiation msg: invalid DH group 20. |
Rebooting the client seemed to be a temporary workaround. But after a couple connections or the laptop going to sleep the issue would come back.
Workaround
The reason I say I assume it is a Windows 10 bug is because if I connect via Windows Settings > Network & Internet > VPN it works every time.
I think what I will do if I can’t find a permanent fix is I will create some sort of wrapper application that just triggers “Windows Settings” functionality from a shortcut or system tray icon.
I will update this post as and when I find a permanent fix or a better workaround.
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