Intermittent failures of SQL Server backups to URL

SQL Server backups of huge in size to URL might get failed due to insufficinet TIMEOUT value of I/O operation to Azure Blob.

MS released fix for the problem for SQL Server 2012, 2014 and 2016 versions - https://support.microsoft.com/en-us/help/4023679/fix-timeout-when-you-back-up-a-large-database-to-url-in-sql-server-201

Problem 

The backups to URL had been failing intermittently. 

• We have the Native SQL Server backups to URL of 150 DBs in SQL Servers on Virtual Machines configured to Azure Blob Storage.
• The data of 150 DBs together is more than 2 TB. 
• We did enable COMPRESSION for SQL Server Backup.
• We are using GENERAL PURPOSE Storage Account. 
• SQL Server Version is 2016 on Azure VM.

Work Done

1. Enabled trace flag - 3051 on SQL Server to track the detailed error message during the failure of backup job to the ERROR LOG. 
2. The idea is to validate whether Proxy is the issue or not. 
3. My Customer doesn't want to bypass the proxy due to security reasons. 
4. Applied the above mentioned fix in TEST environment and verified that the backup job runs fine consistently.