关于ASA5520的radius认证remote vpn用户配置延时

近日对ciscovpn认证服务器进行迁移发现ASA5520配置raidus后会有一定延时（启动时间）才能进行验证。

配置命令后，使用 test aaa-server authentication remote_vpn_auth username命令验证用户/密码通过，但cisco客户端无法完成认证。3分钟后发现server状态启用，正常拨入。

第一次show发现server状态为error，再一次show发现正常启用了。

ciscoasa# show aaa-server
Server Group:    LOCAL
Server Protocol: Local database
Server Address:  None
Server port:     None
Server status:   ACTIVE, Last transaction at 13:39:02 UTC Fri Aug 17 2012
Number of pending requests              0
Average round trip time                 0ms
Number of authentication requests       214
Number of authorization requests        0
Number of accounting requests           0
Number of retransmissions               0
Number of accepts                       22
Number of rejects                       192
Number of challenges                    0
Number of malformed responses           0
Number of bad authenticators            0
Number of timeouts                      0
Number of unrecognized responses        0

Server Group:    remote_vpn_auth
Server Protocol: radius
Server Address:  172.17.4.105
Server port:     1645(authentication), 1646(accounting)
Server status:   FAILED, Server disabled at 13:30:08 UTC Fri Aug 17 2012Number of pending requests              0
Average round trip time                 70ms
Number of authentication requests       5
Number of authorization requests        0
Number of accounting requests           0
Number of retransmissions               0
Number of accepts                       2
Number of rejects                       0
Number of challenges                    0
Number of malformed responses           0
Number of bad authenticators            0
Number of timeouts                      3
Number of unrecognized responses        0

ciscoasa# show aaa-server
Server Group:    LOCAL
Server Protocol: Local database
Server Address:  None
Server port:     None
Server status:   ACTIVE, Last transaction at 13:39:03 UTC Fri Aug 17 2012
Number of pending requests              0
Average round trip time                 0ms
Number of authentication requests       214
Number of authorization requests        0
Number of accounting requests           0
Number of retransmissions               0
Number of accepts                       22
Number of rejects                       192
Number of challenges                    0
Number of malformed responses           0
Number of bad authenticators            0
Number of timeouts                      0
Number of unrecognized responses        0

Server Group:    remote_vpn_auth
Server Protocol: radius
Server Address:  172.17.4.105
Server port:     1645(authentication), 1646(accounting)
Server status:   ACTIVE, Last transaction at 13:39:31 UTC Fri Aug 17 2012
Number of pending requests              0
Average round trip time                 70ms
Number of authentication requests       5
Number of authorization requests        0
Number of accounting requests           0
Number of retransmissions               0
Number of accepts                       2
Number of rejects                       0
Number of challenges                    0
Number of malformed responses           0
Number of bad authenticators            0
Number of timeouts                      3
Number of unrecognized responses        0