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Anonymous_User
Contributor
May 5, 2009
Question

IPSec Port 4500 needed?

  • May 5, 2009
  • 2 replies
  • 8460 views
Hi there, i' ve a serious problem with a IPSec-VPN Site to Site connection. At one site i do not have port udp 4500 open and the connection fails. Is there a possibility to change the remote port for IPSec-VPN? Thanks for your help.

      2 replies

      doshbass
      doshbass
      New Member
      May 5, 2009
      IPSEC does not use udp port 4500, IPSEC is an IP protocol and teh suite uses port 500 for IKE negotiation in Phase 1. Perhaps the remote end is setup to tunnel IPSEC over udp port 4500.
      A
      Anonymous_UserAuthor
      Contributor
      May 5, 2009
      Can I change the remote port? Everytime I close the 4500 an open another port for that i get an error. The firewall between logs that always port 4500 is tried by the remote firewall.
      abelio
      SuperUser
      abelio
      SuperUser
      May 5, 2009
      IPsec usually encapsulates within 4500/UDP to traverse ' NATters' devices (rfc3948) Check both peers playing with NAT traversal settings
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