なんか筑波のOpenVPN自体がいま繋がらなくなってるよね

VERIFY ERROR: depth=1, error=unable to get local issuer certificate: C=US, O=Let's Encrypt, CN=R3, serial=1929614963399686749********************
OpenSSL: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
TLS_ERROR: BIO read tls_read_plaintext error
TLS Error: TLS object -> incoming plaintext read error
TLS Error: TLS handshake failed
Fatal TLS error (check_tls_errors_co), restarting