I'm not aware of any timing limitations (as with the SSLVPN I can even wait for 30s using the same 2nd authentication as for L2TP) - the whole chain (firewall-Nps-Freeradius) has minimum 30s timeout configured.
Ok... If 30 seconds is not enough, that is a bit of a concern.
With 'Sleep 3' it is still connected successfully - anything above 3 seconds just makes the L2TP VPN connection unsuccessful. Checked in the firewall - timeout is 90s.
You might want to check what the complete end-to-end timing is... Stefan Paetow Moonshot Industry & Research Liaison Coordinator t: +44 (0)1235 822 125 gpg: 0x3FCE5142 xmpp: stefanp@jabber.dev.ja.net skype: stefan.paetow.janet jisc.ac.uk Jisc is a registered charity (number 1149740) and a company limited by guarantee which is registered in England under Company No. 5747339, VAT No. GB 197 0632 86. Jisc¹s registered office is: One Castlepark, Tower Hill, Bristol, BS2 0JA. T 0203 697 5800.