There are plans to release Micropatch 0.9.20_4 on September 27th, 2017
Maintenance will begin at 03:30 Pacific Time (10:30 UTC) and will last approximately one hour and thirty minutes.
During maintenance, World of Tanks servers may become unavailable, however you should still be able to login and play.
Due to the micropatch World of Tanks servers will be unavailable on 27.09.2017:
WoT both EU servers – 4:30 UTC (06:30 CEST)
WoT Eu 1 – 5:00 UTC (07:00 CEST)
WoT Eu 2 – 5:30 UTC (07:30 CEST)
Each restart will take approximately 25 minutes.