If this was a problem at SE's servers, EVERYONE would have had connection issues.
People in my LS affected last night:
eastern and western canada, NE USA
unaffected in my LS:
west coast USA, south USA
Dude in NE USA used a VPN to connect from Texas and was able to connect after.
Trace Route before R0:
C:\>tracert -4 202.67.54.123
Tracing route to 202.67.54.123 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms RT-AC68U-3C18 [192.168.1.1]
2 1 ms <1 ms <1 ms 10.0.0.1
3 9 ms 22 ms 8 ms *.*.*.*
4 10 ms 9 ms 9 ms *.*.*.*
5 10 ms 9 ms 8 ms po-2-rur102.bellevue.wa.seattle.comcast.net [69.139.160.26]
6 11 ms 11 ms 11 ms be-103-ar01.seattle.wa.seattle.comcast.net [69.139.164.77]
7 13 ms 12 ms 9 ms be-33650-cr01.seattle.wa.ibone.comcast.net [68.86.93.165]
8 12 ms 11 ms 10 ms be-10846-pe01.seattle.wa.ibone.comcast.net [68.86.86.90]
9 11 ms 13 ms 10 ms be3014.ccr21.sea02.atlas.cogentco.com [154.54.11.229]
10 29 ms 32 ms 29 ms be3717.ccr22.sfo01.atlas.cogentco.com [154.54.86.209]
11 31 ms 28 ms 29 ms be3670.ccr41.sjc03.atlas.cogentco.com [154.54.43.14]
12 137 ms 136 ms 136 ms be3696.ccr21.tyo01.atlas.cogentco.com [154.54.86.138]
13 137 ms 147 ms 142 ms be3723.rcr51.b060372-1.tyo01.atlas.cogentco.com [154.54.87.190]
14 137 ms 135 ms 136 ms square-enix.demarc.cogentco.com [154.18.1.146]
15 116 ms 115 ms 116 ms 61.195.56.165
16 148 ms 137 ms 137 ms 219.117.144.74
17 135 ms 133 ms 133 ms 219.117.144.53
18 137 ms 135 ms 137 ms 219.117.146.141
19 138 ms 137 ms 137 ms 219.117.147.42
20 138 ms 137 ms 135 ms 202.67.54.123
Trace complete.
Trace Route after R0:
C:\>tracert -4 202.67.54.123
Tracing route to 202.67.54.123 over a maximum of 30 hops
1 <1 ms <1 ms 1 ms RT-AC68U-3C18 [192.168.1.1]
2 1 ms 1 ms 1 ms 10.0.0.1
3 8 ms 9 ms 10 ms *.*.*.*
4 10 ms 8 ms 8 ms *.*.*.*
5 9 ms 9 ms 10 ms po-2-rur102.bellevue.wa.seattle.comcast.net [69.139.160.26]
6 12 ms 11 ms 8 ms be-103-ar01.seattle.wa.seattle.comcast.net [69.139.164.77]
7 13 ms 11 ms 11 ms be-33650-cr01.seattle.wa.ibone.comcast.net [68.86.93.165]
8 12 ms 11 ms 11 ms be-10846-pe01.seattle.wa.ibone.comcast.net [68.86.86.90]
9 12 ms 12 ms 12 ms be3014.ccr21.sea02.atlas.cogentco.com [154.54.11.229]
10 * * * Request timed out.
11 * * * Request timed out.
12 * * * Request timed out.
For me, it seems to be crapping out on the cogentco pipeline from Seattle to SFO.
my tracert last night looked almost the same:
my local network / ISP to ord03 to ord01 (DC) to mci01 (MMM) to den01 (denver) to slc01 (salt lake) and timed out. This morning the connection from slc01 and sfo01 seems to be restored.
8 46 ms 37 ms 33 ms 209.148.235.93
9 36 ms 34 ms 29 ms be812.ccr41.ord03.atlas.cogentco.com [154.54.9.9]
10 37 ms 33 ms 38 ms be2765.ccr41.ord01.atlas.cogentco.com [154.54.45.17]
11 54 ms 49 ms 48 ms be2831.ccr21.mci01.atlas.cogentco.com [154.54.42.165]
12 87 ms 69 ms 60 ms be3035.ccr21.den01.atlas.cogentco.com [154.54.5.89]
13 66 ms 67 ms 74 ms be3037.ccr21.slc01.atlas.cogentco.com [154.54.41.145]
---timed out after here last night)
14 92 ms 88 ms 92 ms be3109.ccr21.sfo01.atlas.cogentco.com [154.54.44.137]
15 84 ms 91 ms 86 ms be3669.ccr41.sjc03.atlas.cogentco.com [154.54.43.10]
16 191 ms 191 ms 189 ms be3696.ccr21.tyo01.atlas.cogentco.com [154.54.86.138]
17 191 ms 197 ms 197 ms be3723.rcr51.b060372-1.tyo01.atlas.cogentco.com [154.54.87.190]
18 190 ms 188 ms 195 ms square-enix.demarc.cogentco.com [154.18.1.146]
19 196 ms 188 ms 194 ms 61.195.56.165