This is almost always a firewall or routing issue. Check that you can ping the server from the WLC ( ping ). Increase the TFTP timeout settings inside your TFTP server software (e.g., change timeout to 30 seconds in TFTPd64). Alternatively, switch from TFTP to SFTP.
How to Make Your Cisco WLC 2504 Go to product viewer dialog for this item. Firmware Download Work Successfully To get a Cisco WLC 2504 cisco wlc 2504 firmware download work
For example, the official download page for WLC 2504 Release 8.5 software was historically available at the Cisco Software Download portal, containing both the main controller image AIR-CT2500-K9-8-5-131-0.aes (183.19 MB) and the supplementary AP bundle AIR-CT2500-AP_BUNDLE-K9-8-5-131-0.aes (69.62 MB). This is almost always a firewall or routing issue
In many cases, users maintain repositories of older software. users maintain repositories of older software.