I don't know what else to tell you, sorry. When I had this problem is was because the router at the other end was not sending the ETERNAL IP Address in the SIP headers. I turned off ALG for sip on that router and everything was fine. Did you try the NDLB settings as others recommended? From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of pratham2013 Sent: Thursday, April 25, 2013 2:38 PM To: freeswitch-users@lists.freeswitch.org Subject: Re: [Freeswitch-users] ERROR 404 BAD HEADER Hello Sean, I'm still having this issue as I tried everything. When I try to register with voip.ms account then its working well. I'm not getting 400 bad header but in plae of voip.ms domain if I put my server ip then its giving 400 bad header. I can not debug this so please help me. Thanks Manish Khilwani _____ View this message in context: Re: ERROR 404 BAD HEADER <http://freeswitch-users.2379917.n2.nabble.com/ERROR-404-BAD-HEADER-tp759004 0p7590127.html> Sent from the freeswitch-users mailing list archive <http://freeswitch-users.2379917.n2.nabble.com/> at Nabble.com.