On random, rare, occasions one of our offices will drop off the face of the Earth. After troubleshooting with users in that office, you’ll find that there is always one symptom:
They can browse the web but cannot access any network resources in the company.
What will work 99% of the time is entering these two commands into your Cisco ASA firewall:
clear crypto isakmp sa clear crypto ipsec sa
What these two lines of code will do is drop ALL site-to-site vpn connections and rebuild the tunnels.
It takes about a minute or so for everything to start working again but these two commands have saved me time and again.
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