My tunnel had been running fine for a couple of months. Now, not so much.
Here is some debug. I hope this has enough info for someone to assist me. Thanks!
ISADB: reaper checking SA 0x12ecb04, conn_id = 0
ISADB: reaper checking SA 0x12ecb04, conn_id = 0
ISAKMP: rekeying phase 1 SA, src s.s.s.s, dst d.d.d.d
ISAKMP (0:0): sending NAT-T vendor ID - rev 2 & 3
crypto_isakmp_process_block:src:d.d.d.d, dest:s.s.s.s spt:500 dpt:500
OAK_MM exchange
ISAKMP (0): processing SA payload. message ID = 0
ISAKMP (0): Checking ISAKMP transform 1 against priority 1 policy
ISAKMP: encryption DES-CBC
ISAKMP: hash MD5
ISAKMP: default group 1
ISAKMP: auth pre-share
ISAKMP: life type in seconds
ISAKMP: life duration (basic) of 1000
ISAKMP (0): atts are acceptable. Next payload is 0
ISAKMP (0): processing vendor id payload
ISAKMP (0:0): vendor ID is NAT-T
ISAKMP (0): processing vendor id payload
ISAKMP (0): SA is doing pre-shared key authentication using id type ID_IPV4_ADDR
ISAKMP (0:0): constructed HIS NAT-D
ISAKMP (0:0): constructed MINE NAT-D
ISAKMP (0:0): Detected port floating
return status is IKMP_NO_ERROR
crypto_isakmp_process_block:src:d.d.d.d, dest:s.s.s.s spt:500 dpt:500
OAK_MM exchange
ISAKMP (0): processing KE payload. message ID = 0
ISAKMP (0): processing NONCE payload. message ID = 0
ISAKMP (0): processing vendor id payload
ISAKMP (0): processing vendor id payload
ISAKMP (0): received xauth v6 vendor id
ISAKMP (0): processing vendor id payload
ISAKMP (0): speaking to another IOS box!
ISAKMP (0): processing vendor id payload
ISAKMP (0): speaking to a VPN3000 concentrator
ISAKMP (0:0): Detected NAT-D payload
ISAKMP (0:0): NAT match MINE hash
ISAKMP (0:0): Detected NAT-D payload
ISAKMP (0:0): NAT match HIS hash
ISAKMP (0): ID payload
next-payload : 8
type : 1
protocol : 17
port : 500
length : 8
ISAKMP (0): Total payload length: 12
return status is IKMP_NO_ERROR
crypto_isakmp_process_block:src:d.d.d.d, dest:s.s.s.s spt:500 dpt:500
OAK_MM exchange
ISAKMP (0): processing ID payload. message ID = 0
ISAKMP (0): processing HASH payload. message ID = 0
ISAKMP (0): processing vendor id payload
ISAKMP (0): remote peer supports dead peer detection
ISAKMP (0): SA has been authenticated
return status is IKMP_NO_ERROR
VPN Peer: ISAKMP: Peer ip:d.d.d.d/500 Ref cnt incremented to:4 Total VPN Peers:1
ISAKMP (0): deleting SA: src s.s.s.s, dst d.d.d.d
ISADB: reaper checking SA 0x137cc64, conn_id = 0
ISADB: reaper checking SA 0x12ecb04, conn_id = 0 DELETE IT!
VPN Peer: ISAKMP: Peer ip:d.d.d.d/500 Ref cnt decremented to:3 Total VPN Peers:1
ISADB: reaper checking SA 0x137cc64, conn_id = 0
