Only 10 seconds to enter VPN credentials

David_ECA

Hello,

I have a USG Flex 100 on which I have configured an L2TP / IPSec VPN with pre-shared key and identification on Active Directory.

This one works very well, with one detail:

If the user takes more than exactly 10 seconds to enter their credentials, the connection fails.

Does anyone have any idea where this might come from?

Here is what I get in the USG Flex logs:

10   2020-11-07 23:53:01 ***REMOTE_IP***:500                        ***VPN_IP***:500                      
     info                ike                    IKE_LOG                                         
     The cookie pair is : 0xxxxxxxxxxxxxxxxx / 0xxxxxxxxxxxxxxxxx
11   2020-11-07 23:53:01 ***REMOTE_IP***:500                        ***VPN_IP***:500                      
     info                ike                    IKE_LOG                                         
     Recv Main Mode request from [***REMOTE_IP***]
12   2020-11-07 23:53:01 ***REMOTE_IP***:500                        ***VPN_IP***:500                      
     info                ike                    IKE_LOG                                         
     The cookie pair is : 0xxxxxxxxxxxxxxxxx / 0xxxxxxxxxxxxxxxxx [count=2]
13   2020-11-07 23:53:01 ***REMOTE_IP***:500                        ***VPN_IP***:500                      
     info                ike                    IKE_LOG                                         
     Recv:[SA][VID][VID][VID][VID][VID][VID][VID][VID]
14   2020-11-07 23:53:01 ***REMOTE_IP***:500                        ***VPN_IP***:500                      
     info                ike                    IKE_LOG                                         
     Recv IKE sa: SA([0] protocol = IKE (1), AES CBC key len = 256, HMAC-SHA1 PRF, HMAC-SHA1-96, 384 bit ECP, AES CBC key len = 128, 256 bit ECP, 2048 bit MODP, 3DES, 1024 bit MODP; ).
15   2020-11-07 23:53:01 ***VPN_IP***:500                      ***REMOTE_IP***:500                        
     info                ike                    IKE_LOG                                         
     The cookie pair is : 0xxxxxxxxxxxxxxxxx / 0xxxxxxxxxxxxxxxxx [count=2]
16   2020-11-07 23:53:01 ***VPN_IP***:500                      ***REMOTE_IP***:500                        
     info                ike                    IKE_LOG                                         
     Send:[SA][VID][VID][VID][VID][VID][VID][VID][VID][VID][VID]
17   2020-11-07 23:53:01 ***REMOTE_IP***:500                        ***VPN_IP***:500                      
     info                ike                    IKE_LOG                                         
     Recv:[KE][NONCE][PRV][PRV]
18   2020-11-07 23:53:01 ***VPN_IP***:500                      ***REMOTE_IP***:500                        
     info                ike                    IKE_LOG                                         
     Send:[KE][NONCE][PRV][PRV]
19   2020-11-07 23:53:01 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     The cookie pair is : 0xxxxxxxxxxxxxxxxx / 0xxxxxxxxxxxxxxxxx [count=3]
20   2020-11-07 23:53:01 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     Recv:[ID][HASH]
21   2020-11-07 23:53:01 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     The cookie pair is : 0xxxxxxxxxxxxxxxxx / 0xxxxxxxxxxxxxxxxx [count=7]
22   2020-11-07 23:53:01 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     Send:[ID][HASH]
23   2020-11-07 23:53:01 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     Phase 1 IKE SA process done
24   2020-11-07 23:53:01 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     Recv:[HASH][SA][NONCE][ID][ID][PRV][PRV]
25   2020-11-07 23:53:01 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     Recv IPSec sa: SA([0] protocol = ESP (3), spi_len = 4, spi = 0x00000000, AES CBC key len = 256, HMAC-SHA1-96, No ESN, AES CBC key len = 128, 3DES, DES, NULL; ).
26   2020-11-07 23:53:01 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     Recv TSi: ipv4(udp:1701,***REMOTE_LOCAL_IP***), TSr: ipv4(udp:1701,***VPN_IP***).
27   2020-11-07 23:53:01 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     Send:[HASH][SA][NONCE][ID][ID][PRV][PRV]
29   2020-11-07 23:53:01 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     Recv:[HASH]
30   2020-11-07 23:53:01 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     [Responder:***VPN_IP***][Initiator:***REMOTE_IP***]
31   2020-11-07 23:53:01 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     [Policy: ipv4(udp:1701,***VPN_IP***)-ipv4(udp:1701,***REMOTE_LOCAL_IP***)]
32   2020-11-07 23:53:01 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     [ESP 3des-cbc|hmac-sha1-96][SPI 0xde3551f7|0xdd86a09c][Lifetime 3620]
33   2020-11-07 23:53:01 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     Dynamic Tunnel [PUPP_L2TP_VPN:PUPP_L2TP_VPN:0xdd86a09c] built successfully
40   2020-11-07 23:53:15 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     The cookie pair is : 0xxxxxxxxxxxxxxxxx / 0xxxxxxxxxxxxxxxxx [count=3]
41   2020-11-07 23:53:15 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     Recv:[HASH][DEL] [count=2]
42   2020-11-07 23:53:15 ***REMOTE_IP***:4500                       ***VPN_IP***:4500                     
     info                ike                    IKE_LOG                                         
     Received delete notification
43   2020-11-07 23:53:15 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     The cookie pair is : 0xxxxxxxxxxxxxxxxx / 0xxxxxxxxxxxxxxxxx
44   2020-11-07 23:53:15 ***VPN_IP***:4500                     ***REMOTE_IP***:4500                       
     info                ike                    IKE_LOG                                         
     ISAKMP SA [PUPP_L2TP_VPN] is disconnected

Thanks for the suggestions!

Jeremylin

If you enter password more than 10 seconds, the VPN will be established failed? If so, it looks like timeout related with AD or clients.