Well, LDAP is Windows AD, and they're constantly up, I more think it's a issue from the KVM running freeradius VM, that for some reason networking is lost, or the switches. I would get failed authentications somewhere else as well, not just through freeradius with group AD check.
Well... Active Directory *loves* referrals and if one of the DCs that is being referred to is slow to respond you get... timeouts. It may not be related to your case, but keep that in mind too. 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. Jisc’s registered office is: One Castlepark, Tower Hill, Bristol, BS2 0JA. T 0203 697 5800.