Unable to connect more than one client at a time on OpenVPN

rmr
Posts: 2
Joined: Sun Jan 21, 2018 8:53 am

Unable to connect more than one client at a time on OpenVPN

Postby rmr » Sun Jan 21, 2018 9:07 am

So if I connect more than one client I start to have issues. It appears that all connecting clients get assigned the same IP though(10.8.0.6 in this case). Multiple people can connect at the same time but I run into issues when attempting to access the network shares. Whenever this occurs, this message shows up in the log:
Replay-window backtrack occurred
I'm using the UDP protocol and was wondering if it's just a bandwidth issue with the UDP packets getting messed up and if I just need to switch to TCP. Running http://www.speedtest.net/ I'm able to get at least 35 Mbps so I didn't know if it was a bandwidth issue or not.
Sun Jan 21 08:49:45 2018 OpenVPN 2.1_rc15 i686-pc-mingw32 [SSL] [LZO2] [PKCS11] built on Nov 19 2008
Sun Jan 21 08:49:45 2018 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info.
Sun Jan 21 08:49:45 2018 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Sun Jan 21 08:49:45 2018 LZO compression initialized
Sun Jan 21 08:49:45 2018 Control Channel MTU parms [ L:1542 D:138 EF:38 EB:0 ET:0 EL:0 ]
Sun Jan 21 08:49:45 2018 Data Channel MTU parms [ L:1542 D:1450 EF:42 EB:135 ET:0 EL:0 AF:3/1 ]
Sun Jan 21 08:49:45 2018 Local Options hash (VER=V4): '41690919'
Sun Jan 21 08:49:45 2018 Expected Remote Options hash (VER=V4): '530fdded'
Sun Jan 21 08:49:45 2018 Socket Buffers: R=[65536->65536] S=[65536->65536]
Sun Jan 21 08:49:45 2018 UDPv4 link local: [undef]
Sun Jan 21 08:49:45 2018 UDPv4 link remote: (vpn ip):1194
Sun Jan 21 08:49:45 2018 TLS: Initial packet from 75.71.8.29:1194, sid=7935a963 2ff8b792
Sun Jan 21 08:49:45 2018 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Sun Jan 21 08:49:45 2018 VERIFY OK: depth=1, /CN=Amahi
Sun Jan 21 08:49:45 2018 VERIFY OK: depth=0, /CN=Amahi-Server-OpenVPN
Sun Jan 21 08:49:46 2018 Data Channel Encrypt: Cipher 'BF-CBC' initialized with 128 bit key
Sun Jan 21 08:49:46 2018 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Sun Jan 21 08:49:46 2018 Data Channel Decrypt: Cipher 'BF-CBC' initialized with 128 bit key
Sun Jan 21 08:49:46 2018 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Sun Jan 21 08:49:46 2018 Control Channel: TLSv1, cipher TLSv1/SSLv3 DHE-RSA-AES256-SHA, 2048 bit RSA
Sun Jan 21 08:49:46 2018 [Amahi-Server-OpenVPN] Peer Connection Initiated with (vpn ip)
Sun Jan 21 08:49:47 2018 SENT CONTROL [Amahi-Server-OpenVPN]: 'PUSH_REQUEST' (status=1)
Sun Jan 21 08:49:47 2018 PUSH: Received control message: 'PUSH_REPLY,route 10.1.10.0 255.255.255.0,dhcp-option DNS 10.1.10.191,dhcp-option DOMAIN rmrvpn.net,route 10.8.0.1,topology net30,ping 10,ping-restart 220,ifconfig 10.8.0.6 10.8.0.5'
Sun Jan 21 08:49:47 2018 OPTIONS IMPORT: timers and/or timeouts modified
Sun Jan 21 08:49:47 2018 OPTIONS IMPORT: --ifconfig/up options modified
Sun Jan 21 08:49:47 2018 OPTIONS IMPORT: route options modified
Sun Jan 21 08:49:47 2018 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified
Sun Jan 21 08:49:47 2018 ROUTE default_gateway=10.0.0.1
Sun Jan 21 08:49:47 2018 TAP-WIN32 device [Ethernet 2] opened: \\.\Global\{1DC4BFD7-F74C-432D-9339-41370FFA7648}.tap
Sun Jan 21 08:49:47 2018 TAP-Win32 Driver Version 9.4
Sun Jan 21 08:49:47 2018 TAP-Win32 MTU=1500
Sun Jan 21 08:49:47 2018 Notified TAP-Win32 driver to set a DHCP IP/netmask of 10.8.0.6/255.255.255.252 on interface {1DC4BFD7-F74C-432D-9339-41370FFA7648} [DHCP-serv: 10.8.0.5, lease-time: 31536000]
Sun Jan 21 08:49:47 2018 Successful ARP Flush on interface [3] {1DC4BFD7-F74C-432D-9339-41370FFA7648}
Sun Jan 21 08:49:49 2018 TEST ROUTES: 2/2 succeeded len=2 ret=1 a=0 u/d=up
Sun Jan 21 08:49:49 2018 C:\WINDOWS\system32\route.exe ADD 10.1.10.0 MASK 255.255.255.0 10.8.0.5
Sun Jan 21 08:49:49 2018 C:\WINDOWS\system32\route.exe ADD 10.8.0.1 MASK 255.255.255.255 10.8.0.5
Sun Jan 21 08:49:49 2018 Initialization Sequence Completed
Sun Jan 21 08:50:29 2018 Replay-window backtrack occurred [2]
Sun Jan 21 08:50:46 2018 Replay-window backtrack occurred [3]
Sun Jan 21 08:57:00 2018 [Amahi-Server-OpenVPN] Inactivity timeout (--ping-restart), restarting
Sun Jan 21 08:57:00 2018 TCP/UDP: Closing socket
Sun Jan 21 08:57:00 2018 SIGUSR1[soft,ping-restart] received, process restarting
Sun Jan 21 08:57:00 2018 Restart pause, 2 second(s)
Sun Jan 21 08:57:02 2018 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info.

rmr
Posts: 2
Joined: Sun Jan 21, 2018 8:53 am

Re: Unable to connect more than one client at a time on OpenVPN

Postby rmr » Sun Jan 21, 2018 9:09 am

Edit: OpenVPN is set to not route all traffic through the VPN, so that's why my download rate is still decently high.

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