Probably there is a routing problem inside their network.
traceroute to kddi.com (106.162.242.108), 64 hops max, 52 byte packets
1 nttec.com (67.219.7.3) 9.449 ms 0.496 ms 0.504 ms
2 208.74.65.5 (208.74.65.5) 11.852 ms 1.347 ms
208.74.65.9 (208.74.65.9) 0.646 ms
3 98.124.130.205 (98.124.130.205) 0.913 ms 0.623 ms 1.294 ms
4 ae4-105.pao10.ip4.gtt.net (199.229.230.141) 15.234 ms 6.665 ms 1.115 ms
5 kddi-gw.ip4.gtt.net (77.67.77.26) 1.292 ms 1.275 ms 1.223 ms
6 pajbb001.int-gw.kddi.ne.jp (111.87.3.57) 1.090 ms
pajbb002.int-gw.kddi.ne.jp (111.87.3.61) 1.277 ms
pajbb002.int-gw.kddi.ne.jp (111.87.3.33) 1.280 ms
7 otejbb205.int-gw.kddi.ne.jp (203.181.100.137) 103.759 ms
otejbb206.int-gw.kddi.ne.jp (203.181.100.201) 95.094 ms
otejbb205.int-gw.kddi.ne.jp (203.181.100.1) 95.050 ms
8 tm4BBAC02.bb.kddi.ne.jp (106.162.175.134) 106.447 ms
tm4BBAC01.bb.kddi.ne.jp (106.162.175.138) 107.999 ms
tm4BBAC02.bb.kddi.ne.jp (106.162.175.30) 107.008 ms
9 tm4BBML63.bb.kddi.ne.jp (182.248.164.94) 104.062 ms 103.634 ms
tm4BBML64.bb.kddi.ne.jp (59.128.99.90) 104.872 ms
10 111.87.220.242 (111.87.220.242) 103.246 ms !X
tm4BBML63.bb.kddi.ne.jp (59.128.99.97) 103.296 ms
111.87.220.242 (111.87.220.242) 110.034 ms !X
