I'm trying to establish an IPSec VPN connection between my site and an ISP. I have a Cisco 1941 router and a Cisco firewall on the ISP side. I set up the configuration according to what the ISP has but the status of the connection remains in a DOWN-Negotiating state.

Here is the config of my router with the results of some show commands.

Router Config

vpn1#show run
Building configuration...

Current configuration : 4644 bytes
! Last configuration change at 13:58:46 UTC Sun Aug 17 2014 by vpnroot
version 15.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname vpn1
boot system flash0:/c1900-universalk9-mz.SPA.153-3.M.bin
logging buffered 51200 warnings
enable secret 4 LPBjJOh2X18NmxK5zKaaRkq6ILnm0.W4U17BMUTYhlE
aaa new-model
aaa authentication login default local
aaa authentication login telnet local
aaa session-id common
ip domain name mccarabia.com
ip cef
no ipv6 cef
multilink bundle-name authenticated
crypto pki trustpoint TP-self-signed-929942026
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-929942026
 revocation-check none
 rsakeypair TP-self-signed-929942026
crypto pki certificate chain TP-self-signed-929942026
 certificate self-signed 01
  30820229 30820192 A0030201 02020101 300D0609 2A864886 F70D0101 05050030
  30312E30 2C060355 04031325 494F532D 53656C66 2D536967 6E65642D 43657274
  69666963 6174652D 39323939 34323032 36301E17 0D313331 30313030 33323532
  375A170D 32303031 30313030 30303030 5A303031 2E302C06 03550403 1325494F
  532D5365 6C662D53 69676E65 642D4365 72746966 69636174 652D3932 39393432
  30323630 819F300D 06092A86 4886F70D 01010105 0003818D 00308189 02818100
  C4C540E7 E4740870 EFF67079 DFC6B8F7 EAE81416 90541D0C CC7F7A92 823D0983
  FCB5F3CD F365F0E4 42791930 2A9E72B0 CE11DDD9 91A23DCE 806B7D23 D3994D76
  5AA375C0 90F3530E 3FF0C864 4717FB4C 69F4DCDF DB33E817 E04F7626 C404C17B
  8E030A54 D76EA2FD FE8E0CEB 68F6A992 3B223DC5 27DB7DAD 8DD81F20 9B8F6E0B
  02030100 01A35330 51300F06 03551D13 0101FF04 05300301 01FF301F 0603551D
  23041830 16801492 01A84F97 BA5D81D8 E6F43A65 5FA80563 5389A430 1D060355
  1D0E0416 04149201 A84F97BA 5D81D8E6 F43A655F A8056353 89A4300D 06092A86
  4886F70D 01010505 00038181 009EA781 A39E3CF2 3A7195B7 313BDAEB 9A69DEEC
  9056BFDE 0E14EE15 E66E547E 190AE853 0CCC84E9 8A160F18 56A072D0 8BCF539E
  2091E1B2 9A90B0AA 63CBBC29 3DF15622 BF288850 E0413B91 BDCFCE12 66E004CA
  D0AB91F1 BFC3E42B 86576C24 0C0412C6 84AB49E1 6BA185A8 D5F9528C E4F78417
  501911AB 95258FDA E95965BA 38
license udi pid CISCO1941/K9 sn FCZ1741924U
license accept end user agreement
license boot module c1900 technology-package securityk9
username VPNROOT privilege 15 secret 4 RoxTpXiIZzs3wSY6UZ2pZFHibLCb1XA3HeKpPCLqN                                                                                        XQ
crypto isakmp policy 2
 encr aes 256
 authentication pre-share
 group 2
crypto isakmp key xxxxx address x.x.x.x
crypto isakmp aggressive-mode disable
crypto ipsec transform-set TransTest esp-aes esp-sha-hmac
 mode tunnel
crypto map aaa local-address GigabitEthernet0/0
crypto map maptest 2 ipsec-isakmp
 set peer x.x.x.x
 set transform-set TransTest
 match address 102
interface Embedded-Service-Engine0/0
 no ip address
interface GigabitEthernet0/0
 description $ETH-LAN$$ETH-SW-LAUNCH$$INTF-INFO-GE 0/0$
 ip address y.y.y.y
 ip nat outside
 ip virtual-reassembly in
 duplex auto
 speed auto
 crypto map maptest
interface GigabitEthernet0/1
 description " Lan Subnet "
 ip address
 ip nat inside
 ip virtual-reassembly in
 duplex auto
 speed auto
ip forward-protocol nd
ip http server
ip http access-class 23
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
ip nat source list 166 interface GigabitEthernet0/0 overload
ip route
ip access-list extended nat
 deny   ip
 permit ip any
access-list 101 permit ip
access-list 102 permit ip any any
access-list 166 permit ip any
line con 0
line aux 0
line 2
 no activation-character
 no exec
 transport preferred none
 transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
 stopbits 1
line vty 0 4
 privilege level 15
 password *************
 login authentication telnet
 transport input ssh
line vty 5 15
 password *************
 transport input ssh
scheduler allocate 20000 1000

vpn1#show crypto s
vpn1#show crypto ses
vpn1#show crypto session
Crypto session current status

Interface: GigabitEthernet0/0
Session status: DOWN-NEGOTIATING
Peer: x.x.x.x port 500
  Session ID: 0
  IKEv1 SA: local y.y.y.y/500 remote x.x.x.x/500 Inactive
  IPSEC FLOW: permit ip
        Active SAs: 0, origin: crypto map

Useful Info

vpn1#show cry
vpn1#show crypto is
vpn1#show crypto isakmp sa
dst             src             state          conn-id status
x.x.x.x  y.y.y.y  MM_SA_SETUP          0 ACTIVE


vpn1#show crypto ipse
vpn1#show crypto ipsec sa de
vpn1#show crypto ipsec sa detail

interface: GigabitEthernet0/0
    Crypto map tag: maptest, local addr y.y.y.y

   protected vrf: (none)
   local  ident (addr/mask/prot/port): (
   remote ident (addr/mask/prot/port): (
   current_peer x.x.x.x port 500
     PERMIT, flags={origin_is_acl,}
    #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0
    #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0
    #pkts compressed: 0, #pkts decompressed: 0
    #pkts not compressed: 0, #pkts compr. failed: 0
    #pkts not decompressed: 0, #pkts decompress failed: 0
    #pkts no sa (send) 32, #pkts invalid sa (rcv) 0
    #pkts encaps failed (send) 0, #pkts decaps failed (rcv) 0
    #pkts invalid prot (recv) 0, #pkts verify failed: 0
    #pkts invalid identity (recv) 0, #pkts invalid len (rcv) 0
    #pkts replay rollover (send): 0, #pkts replay rollover (rcv) 0
    ##pkts replay failed (rcv): 0
    #pkts tagged (send): 0, #pkts untagged (rcv): 0
    #pkts not tagged (send): 0, #pkts not untagged (rcv): 0
    #pkts internal err (send): 0, #pkts internal err (recv) 0

     local crypto endpt.: y.y.y.y, remote crypto endpt.: x.x.x.x
     plaintext mtu 1500, path mtu 1500, ip mtu 1500, ip mtu idb GigabitEthernet0/0
     current outbound spi: 0x0(0)
     PFS (Y/N): N, DH group: none

     inbound esp sas:

     inbound ah sas:

     inbound pcp sas:

     outbound esp sas:

     outbound ah sas:

     outbound pcp sas:
  • Are you able to add some debug output? See Cisco IPSEC Troubleshooting and debug crypto isakmp and debug crypto ipsec Aug 18, 2014 at 8:18
  • 1
    ACL 102 is showing 'permit ip any any' - are you sure you want to encrypt ALL traffic? And you need to show us debug that Gareth asked for, as the negotiation fails with ISAKMP, it's not yet the problem on the traffic/data plane level. Aug 18, 2014 at 8:42
  • thank you guys. the problem is resolved now. the problem was in the transform set. Aug 18, 2014 at 9:35
  • Did any answer help you? if so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could provide and accept your own answer.
    – Ron Maupin
    Aug 10, 2017 at 15:12

2 Answers 2


ACL 102 is showing permit ip any any - are you sure you want to encrypt ALL traffic? And you need to show us debug that Gareth asked for, as the negotiation fails with ISAKMP (debug crypto isakmp and debug crypto ipsec), and it's not yet the problem on the traffic/data plane level.


you need to install security license which by default doesnt come in c1900 series router .

kindly follow the below link for the steps to install security license


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