Q: VPN not working after upgrading to Mavericks

For those who user Junos Pulse: there are a new version (4r6) that is working for me right now.

Hope to help...

Fábio

Had a similar problem, after upgrade to Mavericks I could not connect to my companies L2TP VPN. Followed the following suggestions:

- sudo sysctl -w kern.ipc.maxsockbuf=6291456

- restored the file "options" from my TimeMachine back-up in etc/ppp/

Connection to VPN works now, without a restart.

The options file only has one line: refuse-chap

Hi everyone,

I too had issues and tried just about anything and everything.  I was using the Cisco client that comes with Maverick.  Worked great before the upgrade and then all of the sudden nothing.  I tried to update some of the files as suggested to no availe.  If anything, it made it worst.  Finally, Friday, I decided to reinstall Maverick.  It took two attempts but finally I got a clean download.  Now everything works perfect.  Just need exchange client for email to work.

Someone before mentioned that it's possible not all the files were being downloaded correctly, so that's what made me try it. 

This worked for me.  There was an old setting in /etc/sysctl.conf created by the Apple Broadband Tuner dmg circa 2005. 

http://support.apple.com/kb/DL420

Once removed I'm connecting again.

You might want to try my respone to the VPN server not working after Mavericks upgrade as there appears to be some changes with how universal plug and play is working with the new Back to my Mac service and your router.

https://discussions.apple.com/message/23740790#23740790

The router changes may fix VPN client issues as well (NAT/T port forwarding).

The latest server update has fixed my non working VPN server.  I tried numerous tips from this thread but none of them worked.

Hopefully the update fixes the rest of the broken servers out there.

There's another thread and I got a working solution from that, do at your own risk!!!!

https://discussions.apple.com/thread/5468992?start=75&tstart=0

Based on another post I replaced /usr/sbin/racoon with the Mountain Lion Server version from my Time Machine backup and rebooted my Mavericks sever and that fixed the issue of connecting from an external network for me.  Assume Apple will fix racoon soon, hopefully :-). 

For me the latest OS X Server update did not resolve anything.

Summary of what is happening:

• Setup OS X Server 3.0 Clean (no upgrade)
• Setup VPN (both L2TP and PPTP)

• iOS: Internally L2TP works fine
• iOS: Internally PPTP works fine
• OSX: Internally L2TP works fine
• OSX: Internally PPTP works fine

• iOS: Externally PPTP works fine
• iOS: Externally L2TP does not work
• OSX: Externally PPTP does not work
• OSX: Externally L2TP does not work

Internally == Device is on the local network

Externally == Device is outside the local network

Everybody else experiencing the same thing?

I had the same problem - it was an issue with other devices grabbing port 4500 on the router (UPNP and Back to Mac service).  4500 is needed for NAT traversal with L2TP.

See my response further back on this discussion.

I did turn off Back to Mac services and totally reset the Time Capsule.

Am I missing some extra step?

Not sure I'm afraid - my fix worked on the Netgear router, not sure about time capsule.  A couple of people mentioned that there was no UPNP admin on that router so if you have the same problem I'm not sure how to fix it

PS make sure back to mac is disabled on all devices not just the server.  My ipad was actually the one that got the 4500 address on the router that stopped NAT/T going to the server!

I see what you are saying and did do that...perhaps though I did miss one of my many devices. Will be checking that here...thank you!

Though once I set up a manual configuration on the router for port forwarding to the server the router stopped giving out 4500 to UPNP, allowing me to let the devices to back to mac again.