"Mandatory info element out of sequence"

Hi All,   I'm getting the following error "Received packet without a valid source address!!!" on sgsnemu 0.84   [root@n003-000-000-000 openggsn-0.84]# sgsnemu --listen 7.7.7.7 --remote 7.7.7.1 --timelimit 10 --contexts 1 --apn internet --imsi 2400112                34567890 --msisdn 46702123456 -u root -p nsil --createif --defaultroute Using default DNS server Local IP address is:   7.7.7.7 (7.7.7.7) Remote IP address is:  7.7.7.1 (7.7.7.1) IMSI is:               240011234567890 (0xf098765432110042) Using NSAPI:           0 Using GTP version:     1 Using APN:             internet Using selection mode:  1 Using MSISDN:          46702123456 Initialising GTP library openggsn[4597]: GTP: gtp_newgsn() started Setting up interface Done initialising GTP library Sending off echo request Setting up PDP context #0 Waiting for response from ggsn........ Received echo response Received create PDP context response. IP address: 218.59.100.38 Disconnecting PDP context #0 Received packet without a valid source address!!! [root@n003-000-000-000 openggsn-0.84]#   The error I get on GGSN (Cisco 7200) on debugging is "Mandatory info element out of sequence"   *Oct 13 17:01:42.444: GTP IE:4200113254769800:rcvd 0 out of order previous IE 0 *Oct 13 17:01:42.448: %GTP-2-PDPACTIVATIONFAIL: GTP PDP activation/update failed, GSN: 0.0.0.0, TID: 00, Reason: Mandatory info element out of sequence   I'm sticking with 0.84 as 0.91 has a bug while sending echo " Mandatory IE invalid" . Any help on this is greatly appreciated.   Thank you, Anish