Why the client is connected to have to wait for one minute i

[ctrlwind]

Why the client is connected to have to wait for one minute in order to use

client:
xp ,2003
openvpn-connect-1.8.3.347.msi

server:
centos 6.2 i386,x86_64 and ubuntu 10.04
openvpn-as-1.8.4-CentOS5.i386.rpm
openvpn-as-1.8.4-CentOS5.x86_64.rpm
openvpn-as-1.8.4-Ubuntu9.i386.deb

Server using the default settings
License: 10 users
Are the same
Login is successful：

network interrupt

wait a minute
A full 60 seconds


way?

Please help me