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VPN Sierra Server error L2TP VPN server did not respond

Hello to all


I use Sierra server 10.12.6 and vpn service to connect my Mac to my compagny


But since somes days I have an error


Macbook pro (used in 10.12.6 too) say "L2TP VPN server did not respond. Try to connect again. If the problem persists, check the settings and contact the administrator" used in 10.12.6


This error appear only in external


If I use internal ip adresse it s works and connection is OK


The problem is same with local user or OD user


On router UDP ports are open to my server 500 / 1701 and 4500 (all in UDP)


Console.App return


par défaut 09:02:02.213454 +0100 pppd NetworkExtension is the controller

par défaut 09:02:02.215191 +0100 pppd NetworkExtension is the controller

par défaut 09:02:02.324500 +0100 pppd 0x7fcdf7c0b970 opened /private/var/db/mds/system/mdsObject.db: 4636 bytes

par défaut 09:02:02.325234 +0100 pppd 0x7fcdf7d076b0 opened /private/var/db/mds/system/mdsDirectory.db: 50744 bytes

par défaut 09:02:02.330273 +0100 pppd 0x7fcdf7d2aa10 opened /private/var/db/mds/system/mdsDirectory.db: 50744 bytes

par défaut 09:02:02.332692 +0100 pppd 0x7fcdf7c0b350 opened /Library/Keychains/System.keychain: 58684 bytes

erreur 09:02:02.341681 +0100 pppd password not found in the system keychain

par défaut 09:02:02.344193 +0100 pppd publish_entry SCDSet() failed: Success!

par défaut 09:02:02.360737 +0100 pppd publish_entry SCDSet() failed: Success!

par défaut 09:02:02.360988 +0100 pppd pppd 2.4.2 (Apple version 838.50.1) started by admin, uid 510

par défaut 09:02:10.883683 +0100 pppd l2tp_get_router_address

par défaut 09:02:10.884566 +0100 pppd l2tp_get_router_address 192.168.0.1 from dict 0

par défaut 09:02:10.927258 +0100 pppd L2TP connecting to server ‘xxxxxx.com' (x.x.x.x)…

par défaut 09:02:10.997094 +0100 pppd IPSec connection started

par défaut 09:02:21.054190 +0100 pppd IPSec connection failed


Any ideas?

Thanks for your help

Regards, Chris

macOS Sierra (10.12.6)

Posted on Dec 11, 2017 12:31 AM

Reply
5 replies

Dec 11, 2017 10:23 AM in response to chrismac75

Usual trigger for these is a problem with the firewall pass-through; make sure the specified ports and protocols are all passed through your firewall to the target VPN server.


UDP port 500, for IKE; encryption key management

UDP port 4500, for IPSEC NAT-Traversal

ESP protocol 50; for IPsec

AH protocol 51; for IPsec


Port 1701 is used for PPTP, not IPsec.

Dec 12, 2017 9:06 AM in response to chrismac75

Yeah; my bad; got the 1700 ports mixed.


You also need the protocols, not just the ports.


https://blogs.technet.microsoft.com/rrasblog/2006/06/14/which-ports-to-unblock-f or-vpn-traffic-to-pass-through/


I’d suggest the Cisco forums for whatever specific Cisco widget is in use. Details vary: https://sbkb.cisco.com/CiscoSB/GetArticle.aspx?docid=74b5ba42e73f4d0ab19e8b33686 3bd2e_VPN_Passthrough_Configuration_on_RV042.xml

VPN Sierra Server error L2TP VPN server did not respond

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