We're seeing this with a Windows 7 client, where we're trying to connect to two separate OpenVPN community servers at once, on attempting to connect to the second server (in either order):
Mon Jul 30 09:07:01 2012 All TAP-Win32 adapters on this system are currently in use.
Mon Jul 30 09:07:01 2012 Exiting
Michael, is your suggestion that we need to install the TAP adaptor twice, somehow? We're having no problem with Linux and OSX clients running the two connections. (And we're actually using TUN, not TAP, but I guess Windows has the code for TUN in its TAP adaptor.) I've used Google to search this forum (since its own search engine refuses to give any results for "common" terms). This is the only discussion I've found so far of attempting two connections at once for Windows, other than a mention elsewhere of it being something that's not supposed to work. I take it your experience is it can. How should I instruct our Windows 7 users to enable that?