Re: TLS key negotiation failed to occur ISP screws up the VPN

>
>
>
> This node where the logs were from (server):
> OpenVPN 2.4.7 arm-unknown-linux-gnueabihf [SSL (OpenSSL)] [LZO] [LZ4]
> [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Feb 20 2019
>
> Other (client)
> OpenVPN 2.4.0 arm-unknown-linux-gnueabihf [SSL (OpenSSL)] [LZO] [LZ4]
> [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Apr 29 2022
>
> Please do not tell me to upgrade I will upgrade it in the next 5 years but
> this was working just fine till now.
>

These version combinations will work on a good day, but when there is a
network glitch, they could go into a restart dance with both backing off
exponentially and missing each other. This issue was fixed in 2.5.3.

If the above is indeed the issue, a quick way to recover is to restart the
server and client at the same time as Gert mentioned. But that will last
only until the next bad day.


> Here is the log from the client:
>

By matching logs I mean client and server logs at time frames that overlap.
We want to see what the server is doing when the client is trying to
connect.

Selva

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