Aufgrund eines Stromausfalls in Seattle sind die Steam Server für unbestimmte Zeit offline. Statement aus dem Steam Forum dazu:
"There is currently a wide spread power outage in Bellevue/Seattle impacting Steam Server availability. Unfortunately ETA for when the power will be restored is unknown as the power company will only work on restoring it once the storm has eased and the high winds have died down.
Any issues you are experiencing with connecting to Steam are only temporary, as this isn't an end-user issue."