Fatal error in Facebook app: Call to a member function getLongLivedSession() on a non-object

Question

I have a PHP script that posts content on Facebook page of an user. This works through a Facebook app.

When I click Authorize, it loads for 10 seconds, it doesn't post and it shows a blank page with the following error:

exception Failed to connect to 2a03:2880:f01f:2:face:b00c:0:2: Network is  unreachable Fatal error: Call to a member function getLongLivedSession() on a non-object in /var/zpanel/hostdata/zadmin/public_html/mysite/thirdparty/networks/facebook/Facebook.php on line 92

Everything worked perfectly until a week ago, but today I continue to get that error. What is the cause of this problem?

Answer 1

Many servers have IPv6 enabled but it’s not routed and it doesn’t actually work. This turns into a major issue when you are trying to access a site which is IPv6 ready. By default, curl will try to connect via IPv6 and will timeout. Via IPv4 it could work just fine, only if you add this:

curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );

If you encounter this problem with file_get_contents(), get_headers(), etc. you can add the following lines in /etc/sysctl.conf :

#disable ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1 

Or

echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6

Update based on your comments:

Disable ipv6 in freebsd 9

/etc/rc.conf


ipv6_network_interfaces="none" # Default is auto

ipv6_activate_all_interfaces="NO" # this is the default

ip6addrctl_enable="NO" # New way to disable IPv6 support

ip6addrctl_policy="ipv4_prefer" # Use IPv4 instead of IPv6

ipv6_activate_all_interfaces="NO" # Do not automatically add IPv6 addresses