Why do many APs report failures when they are upgraded in batches in FTP mode

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The FTP server limits the number of connected users. When the number of users exceeds the threshold, new link requests are denied or APs fail to log in to the FTP server, which leads to an upgrade failure.

Other related questions:
Why do many APs report failures when version files are loaded in FTP mode
The FTP server limits the number of connected users. When the number of users exceeds the threshold, new link requests are denied or APs fail to log in to the FTP server, which leads to the upgrade failure.

How many AP upgrade modes are available? How do I set the AP upgrade mode
Currently, three AP upgrade modes are available: AC loading, FTP loading and SFTP loading. 1. AC loading: The target version file of the AP is saved on the AC. During loading, the AC sends the target version file to the AP using CAPWAP. 2. FTP loading: The target version file of the AP is saved on the FTP server. During loading, the AP logs in to the FTP server and obtains the target version file. 3. SFTP loading: The target version file of the AP is saved on the SFTP server. During loading, the AP logs in to the SFTP server and obtains the target version file. Run the ap-update mode { ftp-mode | ac-mode | sftp-mode } command in WLAN mode to set the AP upgrade mode. There are three upgrade modes that care AC, FTP and SFTP.

Why do APs not load the system software package after a batch upgrade
Locate the problem as follows: 1. Verify that the system software packages stored in active and standby partitions of the flash memory are different from the system software package to be loaded. 2. In FTP or SFTP upgrade mode, check whether the file name and path are correct.

How to batch upgrade APs of the specified type
For V200R005 and earlier versions, perform the following operations to upgrade APs of a specified type in batches on the AC: 1. Run the ap-update mode { ftp-mode | ac-mode | sftp-mode } command in the WLAN view to set the AP upgrade mode. 2. Save the AP version file to the AC, FTP server, or SFTP server. 3. Run the ap-update update-filename filename ap-type type-id [ region region-id ] command in the WLAN view to specify the AP upgrade file. You do not need to add flash:/ to the file name. 4. Run the ap-update multi-load type-id [ region region-id ] command in the WLAN view to batch upgrade APs of the specified type.

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