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Number of L2TP Connections Suddenly Limited (NSA3600)

Until last week we routinely had 60+ users connected via L2TP VPN authenticated to AD via RADIUS. Today the number of users appears to be capped at around 40. Nobody can connect until an existing user drops. What could be the reason? No changes have been made, uptime is 100 days. Firewall and Windows logs show that authentication is working but connection immediately drops -

Received IKE SA delete request

VPN Inform Received IPsec SA delete request

VPN Inform L2TP Server: Tunnel Disconnect from Remote.

Network Inform PPP: Authentication successful

VPN Inform L2TP Server: RADIUS/LDAP Authentication Success


Thanks

SonicOS Enhanced 6.5.4.4-44n

Category: Mid Range Firewalls
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