General

• How can I build a binary RPM package for my specific Linux platform?
• On Slackware, I get the error: Cipher algorithm 'BF-CBC' not found (OpenSSL)
• What is the principle behind OpenVPN tunnels?
• Are there any known security vulnerabilities with OpenVPN?
• Is it important to OpenVPN security practices to build an intermediate certificate authority/key?
• Does OpenVPN support Certificate Revocation Lists (CRLs)?
• How stable is the OpenVPN Protocol, i.e. can old versions of OpenVPN talk to new versions?
• What is the difference between a TUN device and a TAP device?
• What is Bridging?
• What is the difference between bridging and routing?
• What are the fundamental differences between bridging and routing in terms of configuration?
• Problems with TLS
• Does OpenVPN support IPSec or PPTP?
• Is OpenVPN standards-compliant?
• Can OpenVPN tunnel over a TCP connection?
• Can I use a web browser as an OpenVPN client?
• Why choose TLS as OpenVPN's underlying authentication and key negotiation protocol?
• Why my OpenVPN tunnel does not work after resuming from sleep or hibernation on Windows?

Client

• I am having problems running OpenVPN with the Windows XP firewall enabled. What's wrong?
• Upgraded the OpenVPN daemon on one side of the connection to v2.0, and now it can't connect.
• TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
• "Connection Initiated with x.x.x.x" but I cannot ping the server through the VPN.
• TAP-Win32 adapter is not coming up: "Initialization sequence completed with errors". [#dhcpclientserv]
• I am having trouble getting OpenVPN 1.x to talk with OpenVPN 2.0.
• Why can't I run OpenVPN on Windows from a non-admin user account?
• I uninstalled OpenVPN on Windows 2000 and now it appears that Winsock is broken. How to fix?
• Are there any issues related to pushing DHCP options to Windows clients?
• What to do if the installation of the TAP-Win32 driver fails?
• Can I run multiple OpenVPN tunnels on a single machine?
• "MULTI: bad source address from client , packet dropped" or "GET INST BY VIRT: failed"?
• How do I make the windows network adapter my default adapter again?
• OpenVPN-GUI reinstall to different path breaks it
• Overriding a pushed "route" in the client's config throws an error

Server

• How do I enable IP forwarding?
• Is IPv6 supported?
• OpenVPN server successfully connected a client to it, but when I try to connect a second client, the
• Can an OpenVPN server be set up on a machine with a single NIC?
• When I try ./configure on Red Hat 9 Linux or higher, it complains about OpenSSL headers not found.
• OpenVPN can ping both peers, but I can't reach any of the other machines on the remote subnet.
• Tue Oct 26 14:34:48 2004 36880: write UDPv4: No buffer space available (code=105)
• I can ping through the tunnel, but any real work causes it to lock up. Is this an MTU problem?
• "ifconfig-pool" option use a /30 subnet (4 private IP addresses per client) when used in TUN mode?
• Everything seems to be configured correctly, but I can't ping across the tunnel.
• Can OpenVPN handle the situation where both ends of the connection are dynamic?
• How can I connect Windows XP to a Linux-based Samba server using routing rather than bridging?
• I get the error Cannot ioctl TUNSETIFF tun0: File descriptor in bad state (errno=77)
• Remap local addresses, to connect two networks with an overlap in the private address range?
• I want to set up an ethernet bridge on the 192.168.1.0/24 subnet. existing DHCP.
• OpenVPN as a , forking TCP server which can service multiple clients over a single TCP port?
• Changed hex bytes in the static key, the key still connects to a remote peer using the original key.
• why are --route and --route-ipv6 commands not possible in a ccd/ file?

Android

• ​OpenVPN for Android client FAQ