How to fix googlebot Server Connectivity

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http://serverfault.com – I get 'Server Connectivity' error at google webmaster tool. I suspect it is because of iptables rules that I've set to counter some DDoS attacks, thugh I'm not sure which rules could be relevant. This may also help to know that I use Varnish/nginx combo as webserver and a standard robots.txt. Here are the iptables rules Chain INPUT (policy ACCEPT) target prot opt source destination fail2ban-ssh tcp -- anywhere anywhere multiport dports ssh DROP udp -- anywhere anywhere udp dpt:fsp DROP tcp -- anywher (HowTos)