Salve a tutti.
Sono riuscito a mettere le mani su di un AGTEF e sbloccarlo.
Ho seguito la guida per la VPN e sembra che i passaggi siano andati a buon fine tranne per il fatto che non mi ritrovo la cartella keys dentro openvpn; poco male perchè lascio i files dentro /openvpn con relativa modifica sul file conf).
Anche la porta, invece della standard UDP 1194 opto per la UDP 1195 (con relativa modifica sul file conf).
Dal conf ho tolto la riga inutile "build-key-pkcs12 my-client".
Sul client (OpenVPN per Android) ho importato i files relativi alla configurazione e correttamente caricati dal client stesso.
Il servizio è stato correttamente caricato/riavviato lato server.
Eppure non riesco a connettermi a casua credo del non raggiungimento della porta UDP:
2018-06-06 14:48:27 versione ufficiale 0.7.5 in esecuzione su samsung SM-N910F (APQ8084), Android 7.1.2 (NJH47F) API 25, ABI armeabi-v7a, (samsung/trltexx/trlte:6.0.1/MMB29M/N910FXXS1DQH9:user/release-keys)
2018-06-06 14:48:27 Configurazione in corso…
2018-06-06 14:48:27 New OpenVPN Status (VPN_GENERATE_CONFIG->LEVEL_START):
2018-06-06 14:48:27 New OpenVPN Status (VPN_GENERATE_CONFIG->LEVEL_START):
2018-06-06 14:48:27 started Socket Thread
2018-06-06 14:48:27 Stato della rete: CONNECTED UMTS to MOBILE tre.it
2018-06-06 14:48:27 Debug state info: CONNECTED UMTS to MOBILE tre.it, pause: userPause, shouldbeconnected: true, network: SHOULDBECONNECTED
2018-06-06 14:48:27 Debug state info: CONNECTED UMTS to MOBILE tre.it, pause: userPause, shouldbeconnected: true, network: SHOULDBECONNECTED
2018-06-06 14:48:28 Current Parameter Settings:
2018-06-06 14:48:28 config = '/data/user/0/de.blinkt.openvpn/cache/android.conf'
2018-06-06 14:48:28 mode = 0
2018-06-06 14:48:28 show_ciphers = DISABLED
2018-06-06 14:48:28 show_digests = DISABLED
2018-06-06 14:48:28 show_engines = DISABLED
2018-06-06 14:48:28 genkey = DISABLED
2018-06-06 14:48:28 key_pass_file = '[UNDEF]'
2018-06-06 14:48:28 show_tls_ciphers = DISABLED
2018-06-06 14:48:28 connect_retry_max = 0
2018-06-06 14:48:28 Connection profiles [0]:
2018-06-06 14:48:28 proto = udp
2018-06-06 14:48:28 local = '[UNDEF]'
2018-06-06 14:48:28 local_port = '[UNDEF]'
2018-06-06 14:48:28 remote = '10.8.0.0'
2018-06-06 14:48:28 remote_port = '1195'
2018-06-06 14:48:28 remote_float = DISABLED
2018-06-06 14:48:28 bind_defined = DISABLED
2018-06-06 14:48:28 bind_local = DISABLED
2018-06-06 14:48:28 bind_ipv6_only = DISABLED
2018-06-06 14:48:28 connect_retry_seconds = 2
2018-06-06 14:48:28 connect_timeout = 120
2018-06-06 14:48:28 socks_proxy_server = '[UNDEF]'
2018-06-06 14:48:28 socks_proxy_port = '[UNDEF]'
2018-06-06 14:48:28 tun_mtu = 1500
2018-06-06 14:48:28 tun_mtu_defined = ENABLED
2018-06-06 14:48:28 link_mtu = 1500
2018-06-06 14:48:28 Attendere 0s secondi tra i tentativi di connessione
2018-06-06 14:48:28 link_mtu_defined = DISABLED
2018-06-06 14:48:28 tun_mtu_extra = 0
2018-06-06 14:48:28 tun_mtu_extra_defined = DISABLED
2018-06-06 14:48:28 mtu_discover_type = -1
2018-06-06 14:48:28 fragment = 0
2018-06-06 14:48:28 mssfix = 1450
2018-06-06 14:48:28 explicit_exit_notification = 0
2018-06-06 14:48:28 Connection profiles END
2018-06-06 14:48:28 remote_random = DISABLED
2018-06-06 14:48:28 ipchange = '[UNDEF]'
2018-06-06 14:48:28 dev = 'tun'
2018-06-06 14:48:28 dev_type = '[UNDEF]'
2018-06-06 14:48:28 dev_node = '[UNDEF]'
2018-06-06 14:48:28 lladdr = '[UNDEF]'
2018-06-06 14:48:28 topology = 1
2018-06-06 14:48:28 ifconfig_local = '[UNDEF]'
2018-06-06 14:48:28 ifconfig_remote_netmask = '[UNDEF]'
2018-06-06 14:48:28 ifconfig_noexec = DISABLED
2018-06-06 14:48:28 ifconfig_nowarn = ENABLED
2018-06-06 14:48:28 ifconfig_ipv6_local = '[UNDEF]'
2018-06-06 14:48:28 ifconfig_ipv6_netbits = 0
2018-06-06 14:48:28 ifconfig_ipv6_remote = '[UNDEF]'
2018-06-06 14:48:28 shaper = 0
2018-06-06 14:48:28 mtu_test = 0
2018-06-06 14:48:28 mlock = DISABLED
2018-06-06 14:48:28 keepalive_ping = 0
2018-06-06 14:48:28 keepalive_timeout = 0
2018-06-06 14:48:28 inactivity_timeout = 0
2018-06-06 14:48:28 ping_send_timeout = 0
2018-06-06 14:48:28 ping_rec_timeout = 0
2018-06-06 14:48:28 ping_rec_timeout_action = 0
2018-06-06 14:48:28 ping_timer_remote = DISABLED
2018-06-06 14:48:28 remap_sigusr1 = 0
2018-06-06 14:48:28 persist_tun = ENABLED
2018-06-06 14:48:28 persist_local_ip = DISABLED
2018-06-06 14:48:28 persist_remote_ip = DISABLED
2018-06-06 14:48:28 persist_key = DISABLED
2018-06-06 14:48:28 passtos = DISABLED
2018-06-06 14:48:28 resolve_retry_seconds = 1000000000
2018-06-06 14:48:28 resolve_in_advance = ENABLED
2018-06-06 14:48:28 username = '[UNDEF]'
2018-06-06 14:48:28 groupname = '[UNDEF]'
2018-06-06 14:48:28 chroot_dir = '[UNDEF]'
2018-06-06 14:48:28 cd_dir = '[UNDEF]'
2018-06-06 14:48:28 writepid = '[UNDEF]'
2018-06-06 14:48:28 up_script = '[UNDEF]'
2018-06-06 14:48:28 down_script = '[UNDEF]'
2018-06-06 14:48:28 down_pre = DISABLED
2018-06-06 14:48:28 up_restart = DISABLED
2018-06-06 14:48:28 up_delay = DISABLED
2018-06-06 14:48:28 daemon = DISABLED
2018-06-06 14:48:28 inetd = 0
2018-06-06 14:48:28 log = DISABLED
2018-06-06 14:48:28 suppress_timestamps = DISABLED
2018-06-06 14:48:28 machine_readable_output = ENABLED
2018-06-06 14:48:28 nice = 0
2018-06-06 14:48:28 verbosity = 4
2018-06-06 14:48:28 mute = 0
2018-06-06 14:48:28 gremlin = 0
2018-06-06 14:48:28 status_file = '[UNDEF]'
2018-06-06 14:48:28 status_file_version = 1
2018-06-06 14:48:28 status_file_update_freq = 60
2018-06-06 14:48:28 occ = ENABLED
2018-06-06 14:48:28 rcvbuf = 0
2018-06-06 14:48:28 sndbuf = 0
2018-06-06 14:48:28 sockflags = 0
2018-06-06 14:48:28 fast_io = DISABLED
2018-06-06 14:48:28 comp.alg = 2
2018-06-06 14:48:28 comp.flags = 1
2018-06-06 14:48:28 route_script = '[UNDEF]'
2018-06-06 14:48:28 route_default_gateway = '[UNDEF]'
2018-06-06 14:48:28 route_default_metric = 0
2018-06-06 14:48:28 route_noexec = DISABLED
2018-06-06 14:48:28 route_delay = 0
2018-06-06 14:48:28 route_delay_window = 30
2018-06-06 14:48:28 route_delay_defined = DISABLED
2018-06-06 14:48:28 route_nopull = DISABLED
2018-06-06 14:48:28 route_gateway_via_dhcp = DISABLED
2018-06-06 14:48:28 allow_pull_fqdn = DISABLED
2018-06-06 14:48:28 management_addr = '/data/user/0/de.blinkt.openvpn/cache/mgmtsocket'
2018-06-06 14:48:28 management_port = 'unix'
2018-06-06 14:48:28 management_user_pass = '[UNDEF]'
2018-06-06 14:48:28 management_log_history_cache = 250
2018-06-06 14:48:28 management_echo_buffer_size = 100
2018-06-06 14:48:28 management_write_peer_info_file = '[UNDEF]'
2018-06-06 14:48:28 management_client_user = '[UNDEF]'
2018-06-06 14:48:28 management_client_group = '[UNDEF]'
2018-06-06 14:48:28 management_flags = 4390
2018-06-06 14:48:28 shared_secret_file = '[UNDEF]'
2018-06-06 14:48:28 key_direction = not set
2018-06-06 14:48:28 ciphername = 'BF-CBC'
2018-06-06 14:48:28 ncp_enabled = ENABLED
2018-06-06 14:48:28 ncp_ciphers = 'AES-256-GCM:AES-128-GCM'
2018-06-06 14:48:28 authname = 'SHA1'
2018-06-06 14:48:28 prng_hash = 'SHA1'
2018-06-06 14:48:28 prng_nonce_secret_len = 16
2018-06-06 14:48:28 keysize = 0
2018-06-06 14:48:28 engine = DISABLED
2018-06-06 14:48:28 replay = ENABLED
2018-06-06 14:48:28 mute_replay_warnings = DISABLED
2018-06-06 14:48:28 replay_window = 64
2018-06-06 14:48:28 replay_time = 15
2018-06-06 14:48:28 packet_id_file = '[UNDEF]'
2018-06-06 14:48:28 test_crypto = DISABLED
2018-06-06 14:48:28 tls_server = DISABLED
2018-06-06 14:48:28 tls_client = ENABLED
2018-06-06 14:48:28 key_method = 2
2018-06-06 14:48:28 ca_file = '[[INLINE]]'
2018-06-06 14:48:28 ca_path = '[UNDEF]'
2018-06-06 14:48:28 dh_file = '[UNDEF]'
2018-06-06 14:48:28 cert_file = '[[INLINE]]'
2018-06-06 14:48:28 extra_certs_file = '[UNDEF]'
2018-06-06 14:48:28 priv_key_file = '[[INLINE]]'
2018-06-06 14:48:28 pkcs12_file = '[UNDEF]'
2018-06-06 14:48:28 cipher_list = '[UNDEF]'
2018-06-06 14:48:28 tls_cert_profile = '[UNDEF]'
2018-06-06 14:48:28 tls_verify = '[UNDEF]'
2018-06-06 14:48:28 tls_export_cert = '[UNDEF]'
2018-06-06 14:48:28 verify_x509_type = 0
2018-06-06 14:48:28 verify_x509_name = '[UNDEF]'
2018-06-06 14:48:28 crl_file = '[UNDEF]'
2018-06-06 14:48:28 ns_cert_type = 1
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_ku[i] = 0
2018-06-06 14:48:28 remote_cert_eku = '[UNDEF]'
2018-06-06 14:48:28 ssl_flags = 0
2018-06-06 14:48:28 tls_timeout = 2
2018-06-06 14:48:28 renegotiate_bytes = -1
2018-06-06 14:48:28 renegotiate_packets = 0
2018-06-06 14:48:28 renegotiate_seconds = 3600
2018-06-06 14:48:28 handshake_window = 60
2018-06-06 14:48:28 transition_window = 3600
2018-06-06 14:48:28 single_session = DISABLED
2018-06-06 14:48:28 push_peer_info = DISABLED
2018-06-06 14:48:28 tls_exit = DISABLED
2018-06-06 14:48:28 tls_auth_file = '[UNDEF]'
2018-06-06 14:48:28 tls_crypt_file = '[UNDEF]'
2018-06-06 14:48:28 client = ENABLED
2018-06-06 14:48:28 pull = ENABLED
2018-06-06 14:48:28 auth_user_pass_file = '[UNDEF]'
2018-06-06 14:48:28 OpenVPN 2.5-icsopenvpn [git:v2.4_rc2-301-g14adf04a] armeabi-v7a [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [MH/PKTINFO] [AEAD] built on May 3 2018
2018-06-06 14:48:28 library versions: OpenSSL 1.1.0h 27 Mar 2018, LZO 2.10
2018-06-06 14:48:28 MANAGEMENT: Connected to management server at /data/user/0/de.blinkt.openvpn/cache/mgmtsocket
2018-06-06 14:48:28 MANAGEMENT: CMD 'version 2'
2018-06-06 14:48:28 MANAGEMENT: CMD 'hold release'
2018-06-06 14:48:28 MANAGEMENT: CMD 'proxy NONE'
2018-06-06 14:48:28 MANAGEMENT: CMD 'bytecount 2'
2018-06-06 14:48:28 MANAGEMENT: CMD 'state on'
2018-06-06 14:48:29 WARNING: --ns-cert-type is DEPRECATED. Use --remote-cert-tls instead.
2018-06-06 14:48:29 LZO compression initializing
2018-06-06 14:48:29 Control Channel MTU parms [ L:1622 D:1212 EF:38 EB:0 ET:0 EL:3 ]
2018-06-06 14:48:29 Data Channel MTU parms [ L:1622 D:1450 EF:122 EB:406 ET:0 EL:3 ]
2018-06-06 14:48:29 Local Options String (VER=V4): 'V4,dev-type tun,link-mtu 1542,tun-mtu 1500,proto UDPv4,comp-lzo,cipher BF-CBC,auth SHA1,keysize 128,key-method 2,tls-client'
2018-06-06 14:48:29 Expected Remote Options String (VER=V4): 'V4,dev-type tun,link-mtu 1542,tun-mtu 1500,proto UDPv4,comp-lzo,cipher BF-CBC,auth SHA1,keysize 128,key-method 2,tls-server'
2018-06-06 14:48:29 TCP/UDP: Preserving recently used remote address: [AF_INET]10.8.0.0:1195
2018-06-06 14:48:29 Socket Buffers: R=[163840->163840] S=[163840->163840]
2018-06-06 14:48:29 MANAGEMENT: CMD 'needok 'PROTECTFD' ok'
2018-06-06 14:48:29 UDP link local: (not bound)
2018-06-06 14:48:29 UDP link remote: [AF_INET]10.8.0.0:1195
2018-06-06 14:48:29 MANAGEMENT: >STATE:1528289309,WAIT,,,,,,
2018-06-06 14:48:29 New OpenVPN Status (WAIT->LEVEL_CONNECTING_NO_SERVER_REPLY_YET): ,,,,,
2018-06-06 14:48:29 New OpenVPN Status (WAIT->LEVEL_CONNECTING_NO_SERVER_REPLY_YET): ,,,,,
2018-06-06 14:49:29 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
2018-06-06 14:49:29 New OpenVPN Status (RECONNECTING->LEVEL_CONNECTING_NO_SERVER_REPLY_YET): tls-error,,,,,
2018-06-06 14:49:29 New OpenVPN Status (RECONNECTING->LEVEL_CONNECTING_NO_SERVER_REPLY_YET): tls-error,,,,,
2018-06-06 14:49:29 TLS Error: TLS handshake failed
2018-06-06 14:49:29 TCP/UDP: Closing socket
2018-06-06 14:49:29 SIGUSR1[soft,tls-error] received, process restarting
Sono consapevole che i log possono cambiare da client a client però magari qualcuno più esperto di VPN (per me sarebbe le prima volta) può scorgere qualche errore/mancanza...

Grazie
EDIT: Ho provato a testare la porta 1195 dall'esterno tramite GRC ShieldsUP (
https://www.grc.com/x/ne.dll?bh0bkyd2)
Port Status Protocol and Application
1195 Stealth Unknown Protocol and application for this port
E' normale che dall'esterno risulti stealth (ovvero nè open, nè closed)?