Resolved -
The Skype for Business servers are being monitored and have been determined to be stable after the reset to resolve the DDoS attack. CallTower engineers have seen all services normalized. The remaining issues with voicemail and federation have been resolved. At this time, CallTower will be removing all the temporary call forwarding requests that were implemented during this incident.
Jun 23, 15:18 MDT
Monitoring -
CallTower engineers have resolved the DDoS attack and have reset several Skype for Business servers impacted by the high request rate. Services have now normalized with the exception of intermittent voicemail and federation issues. CallTower engineers continue to work to resolve the intermittent issues.
CallTower will be providing additional details around the incident as they become available.
Jun 23, 13:29 MDT
Update -
CallTower engineers have identified the issue to be the result of a Distributed Denial-of-Service (DDoS) attack on Skype for Business. This attack is similar to other prevalent DDoS that have taken place recently on Skype for Business Online in North America and Europe. CallTower engineers are working with Microsoft engineers to isolate and prevent the attack to restore services.
Jun 23, 11:42 MDT
Update -
CallTower engineers have identified the issue to be the result of a higher than normal connection request rate resulting in high CPU utilization. CallTower engineers are working to isolate the source of the increased connection requests.
CallTower Support will forward numbers upon request, please contact
support@calltower.com and provide the number requested to be forward and to where it should be redirected.
Jun 23, 10:27 MDT
Update -
CallTower engineers have been and remain engaged with Microsoft Premier Support to assist in isolating the root-cause of the issue. CallTower and Microsoft are jointly working to identify the reason for the high CPU utilization on the Skype for Business server. CallTower executive management is actively engaged in the situation to assist in resolution.
Jun 23, 09:42 MDT
Update -
CallTower engineers continue to actively work on identifying the root-cause of the issue. Skype for Business (SfB) server is experiencing high CPU usage and may have limited impact on SfB local client (i.e., desktop) and SfB calling. CallTower engineers are continuing to work this issue as a top priority.
Jun 23, 09:13 MDT
Identified -
CallTower engineers have identified an issue with a SQL cluster and are actively working to resolve the issue. The issue may cause limited issues with inbound/outbound calling and sign-in issues through the Skype for Business Client. CallTower executive management is engaged in the issue and the issue is being worked as a top priority.
Jun 23, 08:17 MDT
Investigating -
CallTower Support is investigating an issue affecting customers on the Skype for Business platform. At this time, CallTower engineers have been engaged to isolate and resolve the issue.
Jun 23, 07:26 MDT