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Work from home and get connected to your Office. A virtual private network VPN is a private data network that makes use of the public telecommunication infrastructure Internet , maintaining privacy through the use of a tunneling protocol and security procedures.
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With OpenVPN, you can:. I have much more Windows experience than of macOS so if you can make a sanitized version of your com. Just a quick follow-up. As it pertains to the inability to re-connect, I keep getting error on the Windows event log.
It seems that if I shut down my windows 10 computer and re-attempt later in the day, it connects to the VPN on the first attempt.
Please remember to mark the replies as an answers if they help. If you have feedback for TechNet Subscriber Support, contact tnmff microsoft. Google's 8. You will need to restart vpnd after making the changes. For example:. Concerning the re-connect problem: would you be prepared to make a trace of the IKE events generated by Windows and make the binary data available via OneDrive, Google Drive or equivalent?
It is easy to make the trace, but some forum users are concerned about making binary data publicly available when they don't know what potentially security relevant information might be included in the binary data. The name "gary" above is a placeholder for a trace session name and the name of the output file.
You can examine the output file with a binary editor or a "strings" program, but there are no publicly available tools which nicely format the data - one needs the "private symbol" file for ikeext. After years of experience, I have some techniques that can infer the possible meaning of much of the trace data. Returning to the Internet connectivity problem, when I trace what is happening on the Mac VPN server with tcpdump, I always see something like this:.
Running as root, a command like "tcpdump -i en1 -n udp port 53" should show similar output the interface e. Oops - I just realized that I made two simple mistakes: assuming that my home router was acting as a DNS proxy it isn't and using too narrow a tcpdump filter. It would still be interesting to see how your other Apple devices manage to resolve DNS names Is it interesting that while connected to the VPN from my mac and sniffing packets with the "tcpdump -i en1 -n udp port 53" command no packets are displayed, but as soon as I disconnect from the VPN, all port 53 is displayed?
Not sure if this is worth much, but the traceroute command from any of the connected apple devices shows their first hop to be that of the VPN server, and then the home router as a second hop. I mentioned earlier that " the interface e. Is en1 the correct interface for you Mac acting as a VPN server? The ifconfig command is helpful to identify the interface to trace.
Below is the output of ifconfig on my Mac, with a few key items highlighted in bold text:. The tcpdump command needs to be run on the Mac acting as a VPN server.
The behaviour that you observed suggests that you perhaps performed the tcpdump on the client Mac and not the VPN server Mac. If it looks the same, then one could try a command like "tcpdump -i en1 -n ip host That fact that 8.
However, there seem to be at least 3 established TCP connections to In any event, the connections now seem to be hanging - there is a retransmit on one connection after 6 seconds of inactivity. More tracing is probably necessary - I will try to think about what would be both simplest and most helpful Regarding the re-connectivity issue, where would like me to send you the the binary data file you requested?
Security concerns hindered the exchange of meaningful trace data, but the investigation of the re- connect problems did reveal some differences between a Windows 10 VPN client and an Android client which perhaps has similarities with Apple clients. An hypothesis for the problem has been formed but not confirmed. According to RFC , "The receiver of this Notification Message might then elect to delete any existing SA's it has for the sending system under the assumption that the sending system has rebooted and no longer has access to the original SA's and their associated keying material" - the intent of "Vid-Initial-Contact" [MS-IKEE], section 3.
This is because, in a scenario involving NAT, the client might not be aware of other clients using the same SA. This is a bit "ugly", but does not seem to have any negative consequences the SAs eventually expire. In my test environment, this seemed to happen rarely perhaps one in a hundred connection attempts.
The fact that the Android client sends an Informational message after completing the MM exchanges but before starting the QM exchanges may protect it against this race condition. The weaknesses of this hypothesis is that is makes no distinction between an initial connect and a reconnect: the original poster mentions that the problem occurs on reconnect. Furthermore, the original poster observes the problem repeatedly - it is difficult to believe that a race condition that so often leads to failure could have remained undetected by the racoon developers.
This would help decide whether the number of Security Associations in the Security Association Database has any impact on the problem. In order to be able to connect to the VPN server from the Windows 10 machine, had to kill the racoon service running on the server.
Once successfully connected, I was able to reconnect multiple times by typing the "setkey -F" command after every successful connection as per your instructions. It would then look something like this if you are using the XML plist format :. This should enable Windows 10 to delete an SA when disconnecting.
There will still be some SAs left behind because there are two SAs for each connection one for each direction , but only one is deleted. It would be useful to know if this setting makes use of the "setkey -F" command superfluous.
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