OpenVpn stopped connecting, what happened?

Question

openvpn

good afternoon, I don’t understand the reason, a week ago I stopped connecting to free servers - Open VPN

Initial data:
Win7, Win10
antivirus - no
Internet - tried 2 different providers

When trying to connect with any configuration taken from the vpngate site, the following error occurs:

Sat Mar 21 10:22:09 2020 OpenVPN 2.4.8 x86_64-w64-mingw32 [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [AEAD] built on Oct 31 2019
Sat Mar 21 10:22:09 2020 Windows version 6.1 (Windows 7) 64bit
Sat Mar 21 10:22:09 2020 library versions: OpenSSL 1.1.0l 10 Sep 2019, LZO 2.10
Sat Mar 21 10:22:09 2020 MANAGEMENT: TCP Socket listening on [AF_INET]127.0.0.1 :25340
Sat Mar 21 10:22:09 2020 Need hold release from management interface, waiting...
Sat Mar 21 10:22:10 2020 MANAGEMENT: Client connected from [AF_INET]127.0.0.1:25340
Sat Mar 21 10:22:10 2020 MANAGEMENT: CMD 'state on'
Sat Mar 21 10:22:10 2020 MANAGEMENT: CMD 'log all on'
Sat
Mar 21 10:22:10 2020 MANAGEMENT: CMD 'bytecount 5'
Sat Mar 21 10:22:10 2020 MANAGEMENT: CMD 'hold off'
Sat Mar 21 10:22:10 2020 MANAGEMENT: CMD 'hold release'
Sat Mar 21 10:22:10 2020 WARNING : No server certificate verification method has been enabled. See openvpn.net/howto.html#mitm for more info.
Sat Mar 21 10:22:10 2020 MANAGEMENT: >STATE:
Sat Mar 21 10:22:10 2020 TCP/UDP: Preserving recently used remote address: [AF_INET]186.123.174.219:1195
Sat Mar 21 10:22:10 2020 Socket Buffers: R=[8192->8192] S=[ 8192->8192]
Sat Mar 21 10:22:10 2020 UDP link local: (not bound)
Sat Mar 21 10:22:10 2020 UDP link remote: [AF_INET]186.123.174.219:1195
Sat Mar 21 10:22: 10 2020 MANAGEMENT: >STATE:1584775330,WAIT,,,,,,
Sat Mar 21 10:22:10 2020 MANAGEMENT: >STATE:1584775330,AUTH,,,,,,
Sat Mar 21 10:22:10 2020 TLS: Initial packet from [AF_INET]186.123.174.219:1195, sid=6f0ab442 bc5e6755
Sat Mar 21 10:22:11 2020 VERIFY ERROR: depth=1, error=unable to get local issuer certificate: C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Domain Validation Secure Server CA
Sat Mar 21 10:22:11 2020 OpenSSL: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
Sat Mar 21 10:22:11 2020 TLS_ERROR: BIO read tls_read_plaintext error
Sat Mar 21 10:22:11 2020 TLS Error: TLS object -> incoming plaintext read error
Sat Mar 21 10:22:11 2020 TLS Error: TLS handshake failed
Sat Mar 21 10:22:11 2020 SIGUSR1[soft,tls-error] received, process restarting
Sat Mar 21 10:22 :11 2020 MANAGEMENT: >STATE:1584775331,RECONNECTING,tls-error,,,,,
Sat Mar 21 10:22:11 2020 Restart pause, 5 second(s)

Chose any configuration, history repeats. Tried on different platforms Win 7 and Win 10 same story. I tried another provider - it didn’t help .. Apparently blocking from the RKN?

I also switched to SoftEther later, it worked for several days, and literally 2-3 days ago it also started to break the connection.

Answer 1

error=unable to get local issuer certificate:

You have a problem with certificates.
Perhaps your certificate or CA certificate has expired, or the CA certificate and its server certificate have been changed on the server. In general, there are several combinations, because 3 certificates are usually used in the connection chain (your, server, CA).
In the openvpn config, the corresponding directives contain the paths to the certificate files, check them. Usually their content is in a readable form, but there may be variations.