I am trying to use Stack Overflow from an ipv6 enabled site (2001:6f8:1c3c::1/48), with the following problem: The server cdn.sstatic.net has multiple ipv6 addresses, which ping but seem not to answer to http requests. Since this blocks the render process, it takes 60 seconds before Stack Overflow appears (but without styles).
I tried to fetch the file with curl:
# curl -vi "http://cdn.sstatic.net/stackoverflow/all.css?v=5fb38a3dda0b" * Adding handle: conn: 0x101aeb0 * Adding handle: send: 0 * Adding handle: recv: 0 * Curl_addHandleToPipeline: length: 1 * - Conn 0 (0x101aeb0) send_pipe: 1, recv_pipe: 0 * About to connect() to cdn.sstatic.net port 80 (#0) * Trying 2400:cb00:2048:1::be5d:f43a... * Connected to cdn.sstatic.net (2400:cb00:2048:1::be5d:f43a) port 80 (#0) > GET /stackoverflow/all.css?v=5fb38a3dda0b HTTP/1.1 > User-Agent: curl/7.30.0 > Host: cdn.sstatic.net > Accept: */* > * Recv failure: Connection timed out * Closing connection 0 curl: (56) Recv failure: Connection timed out
Meta Stack Overflow works by the way.
About to connect() to cdn.sstatic.net port 80 (#0) Trying 2400:cb00:2048:1::be5d:f53a... connected Connected to cdn.sstatic.net (2400:cb00:2048:1::be5d:f53a) port 80 (#0). (debug-02.netdna-cdn.com reports "You are hitting the NetDNA Amsterdam Datacenter", but that always seems to use IPv4; 126.96.36.199)