Merge pull request #246355 from vhorne/fw-long-running

update broken link

Author: prmerger-automator[bot]

articles/firewall/long-running-sessions.md

@@ -27,7 +27,7 @@ Azure Firewall scales in/out based on throughput and CPU usage. Scale in is perf
 
 ### Firewall maintenance
 
-The Azure Firewall engineering team updates the firewall on an as-needed basis (usually every month), generally during night time hours in the local time-zone for that region.  Updates include security patches, bug fixes, and new feature roll outs that are applied by configuring the firewall in a [rolling update mode](https://azure.microsoft.com/blog/deployment-strategies-defined/). The firewall instances are put in a drain mode before reimaging them to give short-lived sessions time to drain. Long running sessions remaining on an instance after the drain period are dropped during the restart.
+The Azure Firewall engineering team updates the firewall on an as-needed basis (usually every month), generally during night time hours in the local time-zone for that region.  Updates include security patches, bug fixes, and new feature roll outs that are applied by configuring the firewall in a [rolling update mode](https://blog.itaysk.com/2017/11/20/deployment-strategies-defined#rolling-upgrade). The firewall instances are put in a drain mode before reimaging them to give short-lived sessions time to drain. Long running sessions remaining on an instance after the drain period are dropped during the restart.
 
 ### Idle timeout