PPP LCP not accepting sent CONFACK

Symptom : User receives the PPP LCP not accepting rcv CONFACK message while accepting an incoming call

Back-7507-R-d#debug ppp nego
PPP protocol negotiation debugging is on
Back-7507-R-d#
*Apr 1 04:53:31: ppp37 PPP: Phase is ESTABLISHING
*Apr 1 04:53:31: ppp37 LCP: I FORCED rcvd CONFACK len 19
*Apr 1 04:53:31: ppp37 LCP: AuthProto PAP (0x0304C023)
*Apr 1 04:53:31: ppp37 LCP: MagicNumber 0x0CFEC631 (0x05060CFEC631)
*Apr 1 04:53:31: ppp37 LCP: MRRU 1524 (0x110405F4)
*Apr 1 04:53:31: ppp37 LCP: EndpointDisc 1 yb (0x1305017962)
*Apr 1 04:53:31: ppp37 LCP: I FORCED sent CONFACK len 21
*Apr 1 04:53:31: ppp37 LCP: MRU 1500 (0x010405DC)
*Apr 1 04:53:31: ppp37 LCP: MagicNumber 0x29B34117 (0x050629B34117)
*Apr 1 04:53:31: ppp37 LCP: MRRU 1500 (0x110405DC)
*Apr 1 04:53:31: ppp37 LCP: EndpointDisc 4 Magic (0x1307043EC61C17)
*Apr 1 04:53:31: ppp37 PPP LCP not accepting sent CONFACK
*Apr 1 04:53:31: ppp37 LCP: O TERMREQ [Closed] id 0 len 4
*Apr 1 04:53:31: ppp37 PPP: Phase is TERMINATING
*Apr 1 04:53:31: ppp37 PPP: Sending Acct Event[Down] id[3C]
*Apr 1 04:53:31: ppp37 LCP: State is Closed
*Apr 1 04:53:31: ppp37 PPP: Phase is DOWN

http://www.ciscotaccc.com/kaidara-advisor/accessdial/showcase?case=K16934604


From the debug traces ,you can see "PPP LCP not accepting sent CONFACK" message on offload server .

configure "ppp mtu adaptive" on virtual-template