Have you ever been able to connect to any servers? If not, then probably a configuration error on the router...
DId you check the Bolehvpn dd-wrt guide?
http://www.bolehvpn.net/ddwrt.phpDepending on your version of firmware, it should say in the settings;
nsCertTypeVerification make sure you have this checked.
Make sure you've copied in the files below correctly, meaning no added spaces on the tops or bottom, along with any thing extra added by mistake.
TLS Auth Key - ta.key
CA Cert - ca.cert
Public Client Cert - yourusername.cert
Private Client Key - yourusername.key
Under the
Additional Config section you should have these 3 added;
float
sndbuf 131072
rcvbuf 131072