Authenticate/Decrypt packet error:packet HMAC authentication

mferlitsch

Hi,

I have two OpenVPN servers based on OpenWrt and OpenVPN 2.1.4-3.
On my Windows 7 64-bit client I use OpenVPN 2.2.2 for connect to two servers.

When I use UDP with static keyfile or TLS I get very often this error on client - server doesn't log any errors.
Authenticate/Decrypt packet error: packet HMAC authentication failed

When I use TCP the connection will be interrupted when the same error occurs (always on client side).

I also tried to change the HMAC alg from SHA1 to MD5.
I also tried OpenvPN 2.1.4 on Windows 7 client.

What could I try to solve this problem?

Regards, Markus

mferlitsch

double-post! please remove it! :-)