iOS Mail Client Fails to Access a Mail Server Through the 5 GHz Radio of Huawei APs

Publication Date:  2015-06-15 Views:  211 Downloads:  0
Issue Description
The network diagram is as follows:



At a site, iPad and iPhone devices can access the Wi-Fi network normally through the 5 GHz radio of Huawei APs. However, the built-in mail client of the iOS fails the authentication when attempting to access the exchange or hotmail server. As a result, the iOS devices cannot receive and send emails. The fault does not occur when the iPad and iPhone devices access the Wi-Fi network through the 2.4 GHz radio.

Involved Products and Versions:

Huawei dual-band APs of V200R002C00SPC800 and earlier versions, such as AP6010DN-AGN



Handling Process
Compare the wired and wireless packets obtained when an iOS terminal associates with the 2.4 and 5 GHz radios respectively to check whether the wireless NIC of the terminal sends out authentication packets from the 5 GHz radio. The wireless attributes and parameters of an AP are carried in the Beacon frames. Compare the Beacon frames sent from the 5 GHz radios of an Aruba AP and a Huawei AP. The comparison result shows that the WMM parameters of the Aruba and Huawei APs are different. The value of the ACM field is 0 in the WMM parameters of the Aruba AP but is 1 in WMM parameters of the Huawei AP.

Root Cause
The iOS cannot comply with the 5 GHz radio of Huawei APs. Therefore, the account authentication packet sent from the application layer of the iOS mail client software is discarded by the system drive layer. As a result, the email account authentication cannot be implemented.
Solution
Upgrade the AP version to make the 5 GHz radio of the AP compatible with the iOS.

Suggestions
Analyze packets obtained on the wired and wireless interfaces to determine the faulty procedure. If the fault occurs on the wireless interface, compare and analyze the Beacon frames of a properly-working AP and problematic AP to locate the cause. The wireless attributes and parameters of an AP are carried in the Beacon frames.

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