EIGRP authentication issue

[tinhnho123]

Hello guys,

I have 2 routers that are connected to each other through interface G0/0. Before EIGRP authentication was configured, they could see each other as EIGRP neighbors. The moment I put in authentication on both routers' interfaces G0/0, the EIGRP neighbor ship drops.  Do you see any issue with the routers' authentication?

Router 1:

key chain My_KEY_CHAIN
key 1
key-string MY_KEY_STRING
!

interface GigabitEthernet0/0
ip address 10.1.12.1 255.255.255.252
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 MY_KEY_CHAIN
duplex auto
speed auto
media-type rj45
end

router eigrp 1
network 10.1.12.0 0.0.0.3
network 10.1.13.0 0.0.0.3
R1#

============

Router 2:

key chain My_KEY_CHAIN
key 1
key-string MY_KEY_STRING
!

interface GigabitEthernet0/0
ip address 10.1.12.2 255.255.255.252
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 MY_KEY_CHAIN
duplex auto
speed auto
media-type rj45
end

!

router eigrp 1
network 10.1.12.0 0.0.0.3
network 10.1.23.0 0.0.0.3
R2#

Thanks

[MHM Cisco World · Accepted solution]

only add lifetime into both router, 
and if you can match time learn via NTP, this key is sensitive to time 
MHM

[balaji.bandi · Accepted solution]

not that i remember this is case senstive - check and replace with right case senstive :

My_KEY_CHAIN

also enable debug :

debug eigrp packets

[tinhnho123]

Yes, it was case sensitive. I'm able to bring back neighbor ship between 2 routers after corrected

MY_KEY_CHAIN

. Thanks.