THE INFORMATION IN THIS ARTICLE APPLIES TO:
After installing a CUC / CUCM v9.1 patch, the CUC / CUCM no longer communicates with the SFTP server.
According to Cisco support, "This arises due to a fix implemented with CSCtc49288." https://tools.cisco.com/bugsearch/bug/CSCul38509
Upgrade to ES 188.8.131.5224-1 or later to resolve the issue. https://supportforums.cisco.com/discussion/11823606/cucm-86-backup-sftp-timeout-issue