Telstra customers cut off from AWS Sydney data centre

Telstra customers were unable to connect to their services in one of Amazon Web Services' Sydney data centres this morning as a result of a third-party routing issue, just hours after the company resolved a massive mobile outage overnight.

At around 9am this morning, customers began reporting an inability to access the data centre via both Telstra and Optus mobile and fixed-line connections.

AWS initially advised its customers a routing issue had occurred within Telstra's network.

"This issue is impacting internet connectivity between some customer networks and AWS services in the AP-Southeast-2 region, as well as internet connectivity to non-AWS locations," it said.

"We are working with [Telstra] to determine the scope of the problem and time to resolution."

Telstra did not respond to request for comment. The problem appeared to have been resolved around an hour later.

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AWS said it had mitigated the problem by routing around Telstra's network where possible.

However, it later advised the problem was related to a third-party provider and not Telstra's network as it had initially stated.

"[After routing] traffic away from the Telstra network ... service to customers was restored. Recovery occurred when the third party corrected their defective routing, not as a result of AWS routing traffic away from the Telstra network," AWS said.

The issue comes less than 12 hours after Telstra's mobile services went down nationwide to "about half" of Telstra's 2G, 3G and 4G mobile voice and data customers.

The telco said last night's mobile outage arose after an unspecified problem overseas triggered a large amount of customers to be disconnected from its network, with congestion caused as a result of reconnection.

It promised a full day of free data - its second in just over a month - as an apology for the lack of services.

Updated to include AWS' clarification