У вас с разных сторон отличается MTU, шифрование, длина ключа и т.д., проверяйте конфиги.
проверяйте конфиги.
Дело в том, что я конфиги не менял. Они совершенно не отличаются от тех, что в известной статье, как на сервере так и на клиенте.
Но когда я организовал на ОКлиенте автоматический старт как службы, появились эти предупреждения.
Если же я останавливаю службу (см. лог начиная с Mon Apr 02 12:23:32 ) и запускаю GUI с параметром --connect office1.ovpn (хотя и других конфигов там и нет), то предупреждений WORRNING отсутсвуют. (см лог).
Что же пошло не так при запуске как служба?
Mon Apr 02 12:07:37 2018 OpenVPN 2.4.5 i686-w64-mingw32 [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [AEAD] built on Mar 1 2018
Mon Apr 02 12:07:37 2018 Windows version 6.1 (Windows 7) 32bit
Mon Apr 02 12:07:37 2018 library versions: OpenSSL 1.1.0f 25 May 2017, LZO 2.10
Mon Apr 02 12:07:37 2018 NOTE: your local LAN uses the extremely common subnet address 192.168.0.x or 192.168.1.x. Be aware that this might create routing conflicts if you connect to the VPN server from public locations such as internet cafes that use the same subnet.
Mon Apr 02 12:07:37 2018 open_tun
Mon Apr 02 12:07:37 2018 TAP-WIN32 device [OpenVPN] opened: \\.\Global\{570A1C83-36CD-45AE-B88A-0EF81B83D03C}.tap
Mon Apr 02 12:07:37 2018 Set TAP-Windows TUN subnet mode network/local/netmask = 10.8.0.0/10.8.0.1/255.255.255.0 [SUCCEEDED]
Mon Apr 02 12:07:37 2018 Notified TAP-Windows driver to set a DHCP IP/netmask of 10.8.0.1/255.255.255.0 on interface {570A1C83-36CD-45AE-B88A-0EF81B83D03C} [DHCP-serv: 10.8.0.254, lease-time: 31536000]
Mon Apr 02 12:07:37 2018 Sleeping for 10 seconds...
Mon Apr 02 12:07:47 2018 Successful ARP Flush on interface [13] {570A1C83-36CD-45AE-B88A-0EF81B83D03C}
Mon Apr 02 12:07:47 2018 do_ifconfig, tt->did_ifconfig_ipv6_setup=0
Mon Apr 02 12:07:47 2018 env_block: add PATH=C:\Windows\System32;C:\Windows;C:\Windows\System32\Wbem
Mon Apr 02 12:07:47 2018 env_block: add PATH=C:\Windows\System32;C:\Windows;C:\Windows\System32\Wbem
Mon Apr 02 12:07:47 2018 env_block: add PATH=C:\Windows\System32;C:\Windows;C:\Windows\System32\Wbem
Mon Apr 02 12:07:47 2018 Could not determine IPv4/IPv6 protocol. Using AF_INET6
Mon Apr 02 12:07:47 2018 setsockopt(IPV6_V6ONLY=0)
Mon Apr 02 12:07:47 2018 UDPv6 link local (bound): [AF_INET6][undef]:1194
Mon Apr 02 12:07:47 2018 UDPv6 link remote: [AF_UNSPEC]
Mon Apr 02 12:07:47 2018 Initialization Sequence Completed
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_VER=2.4.5
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_PLAT=win
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_PROTO=2
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_NCP=2
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_LZ4=1
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_LZ4v2=1
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_LZO=1
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_COMP_STUB=1
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_COMP_STUBv2=1
Mon Apr 02 12:08:12 2018 194.123.123.254 peer info: IV_TCPNL=1
Mon Apr 02 12:08:12 2018 194.123.123.254 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1542', remote='link-mtu 1550'
Mon Apr 02 12:08:12 2018 194.123.123.254 WARNING: 'cipher' is used inconsistently, local='cipher BF-CBC', remote='cipher AES-256-GCM'
Mon Apr 02 12:08:12 2018 194.123.123.254 WARNING: 'auth' is used inconsistently, local='auth SHA1', remote='auth [null-digest]'
Mon Apr 02 12:08:12 2018 194.123.123.254 WARNING: 'keysize' is used inconsistently, local='keysize 128', remote='keysize 256'
Mon Apr 02 12:08:12 2018 194.123.123.254 [office1] Peer Connection Initiated with [AF_INET6]::ffff:194.123.123.254:1194
Mon Apr 02 12:23:32 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:32 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:32 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:33 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:34 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:35 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:36 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:36 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:37 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:38 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:39 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:40 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:40 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:41 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:42 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:43 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:44 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:44 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:45 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:46 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:47 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:48 2018 read UDPv6: Unknown error (code=10054)
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_VER=2.4.5
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_PLAT=win
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_PROTO=2
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_NCP=2
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_LZ4=1
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_LZ4v2=1
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_LZO=1
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_COMP_STUB=1
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_COMP_STUBv2=1
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_TCPNL=1
Mon Apr 02 12:23:51 2018 office1/194.123.123.254 peer info: IV_GUI_VER=OpenVPN_GUI_11