Migration OpenVPN 2.3.2 to 2.4.7

imcholz

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OpenVPN has to be migrated to the new server.

Old server: Ubuntu 14.04.5, easy-rsa 2.0, OpenVPN 2.3.2
New server: Ubuntu 20.04, easy-rsa 3.1, OpenVPN 2.4.7

After copying "/etc/openvpn" it did not work, server log was not written and client log says "Unknown error" (see below)

I suppose copying from "/etc/openvpn" is not enough because versions are different.
I have little experience with OpenVPN. Can someone tell me what is necessary?

Code:
Wed Apr 28 09:56:46 2021 OpenVPN 2.4.6 x86_64-w64-mingw32 [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [AEAD] built on Apr 26 2018
Wed Apr 28 09:56:46 2021 Windows version 6.2 (Windows 8 or greater) 64bit
Wed Apr 28 09:56:46 2021 library versions: OpenSSL 1.1.0h  27 Mar 2018, LZO 2.10
Enter Management Password:
Wed Apr 28 09:56:46 2021 MANAGEMENT: TCP Socket listening on [AF_INET]127.0.0.1:25340
Wed Apr 28 09:56:46 2021 Need hold release from management interface, waiting...
Wed Apr 28 09:56:46 2021 MANAGEMENT: Client connected from [AF_INET]127.0.0.1:25340
Wed Apr 28 09:56:47 2021 MANAGEMENT: CMD 'state on'
Wed Apr 28 09:56:47 2021 MANAGEMENT: CMD 'log all on'
Wed Apr 28 09:56:47 2021 MANAGEMENT: CMD 'echo all on'
Wed Apr 28 09:56:47 2021 MANAGEMENT: CMD 'bytecount 5'
Wed Apr 28 09:56:47 2021 MANAGEMENT: CMD 'hold off'
Wed Apr 28 09:56:47 2021 MANAGEMENT: CMD 'hold release'
Wed Apr 28 09:56:47 2021 WARNING: --ns-cert-type is DEPRECATED.  Use --remote-cert-tls instead.
Wed Apr 28 09:56:47 2021 MANAGEMENT: CMD 'password [...]'
Wed Apr 28 09:56:47 2021 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Wed Apr 28 09:56:47 2021 TCP/UDP: Preserving recently used remote address: [AF_INET]217.160.251.170:79
Wed Apr 28 09:56:47 2021 Socket Buffers: R=[65536->65536] S=[65536->65536]
Wed Apr 28 09:56:47 2021 Attempting to establish TCP connection with [AF_INET]217.160.251.170:79 [nonblock]
Wed Apr 28 09:56:47 2021 MANAGEMENT: >STATE:1619596607,TCP_CONNECT,,,,,,
Wed Apr 28 09:58:47 2021 TCP: connect to [AF_INET]217.160.251.170:79 failed: Unknown error
Wed Apr 28 09:58:47 2021 SIGUSR1[connection failed(soft),init_instance] received, process restarting
Wed Apr 28 09:58:47 2021 MANAGEMENT: >STATE:1619596727,RECONNECTING,init_instance,,,,,
Wed Apr 28 09:58:47 2021 Restart pause, 5 second(s)
Wed Apr 28 09:58:52 2021 WARNING: --ns-cert-type is DEPRECATED.  Use --remote-cert-tls instead.
Wed Apr 28 09:58:52 2021 TCP/UDP: Preserving recently used remote address: [AF_INET]217.160.251.170:79
Wed Apr 28 09:58:52 2021 Socket Buffers: R=[65536->65536] S=[65536->65536]
Wed Apr 28 09:58:52 2021 Attempting to establish TCP connection with [AF_INET]217.160.251.170:79 [nonblock]
Wed Apr 28 09:58:52 2021 MANAGEMENT: >STATE:1619596732,TCP_CONNECT,,,,,,
Wed Apr 28 09:58:59 2021 SIGTERM[hard,init_instance] received, process exiting
Wed Apr 28 09:58:59 2021 MANAGEMENT: >STATE:1619596739,EXITING,init_instance,,,,,
 

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