Cisco Wireless LAN Controller (WLC) and Access Point (AP) Console Port Problem (?) Not Coming on Console [Solved]

Hi, I'm Sujoy from India and today I'll tell you about a problem with Cisco WLC and how did I fixed it. I got a complaint that the Console Port on Cisco 2500 Series Wireless LAN Controller is not working. Below is the picture of Cisco 2504 Wireless LAN Controller (WLC).

I used Cisco blue console cable (DB9 female to RJ-45 Male rollover cable).
Here's the connection- I connected RJ-45 end to console port on WLC, DB9 serial end to USB-to-Serial adaptor and connected that to USB port on laptop. Serial adapter driver was installed on my laptop. I ran PuTTy software and selected appropriate COM port and choosed 'Serial' option. But no output on PuTTy screen. I tried changing different BAUD Rate (serial interface speed) such as 9600,115200 bps (bits per second) but it did not work. Below is the picture of Bafo and local-made USB-to-Serial adaptor & Cisco Console Cable.

Then I contacted Cisco Technical Assistance Centre (Cisco TAC), they told console of WLC and AP is not accessible using USB-to-Serial adaptor. But my friend, Cisco was wrong!! Later I purchased a new USB-to-Serial adaptor of brand 'Bafo'. It costs 950 INR (3-4 times of normal adaptor) from Chandni Chowk Electronics Market Kolkata. And that USB-to-Serial adaptor worked with WLC. I was able to access the CLI (command line interface) of Cisco IOS.

Now I'll tell you how to identify 'original' Bafo USB-to-Serial adaptor, because there are many 'copy' products available with same packaging!

Step 1: The adaptor is quite heavy compared to other adaptors in market.

Step 2: The cable provided is 'thick' compared to other adaptors in market. It's basically USB printer cable of standard printer (worked with my HP printer).

Step 3: On the adaptor and on the packaging, there should be sticker with product serial number, both serial numbers should match.

One more info, my older USB-to-Serial adaptor cable and new Bafo cable used same microchip- Prolific 340, so my old driver is working with new cable. So what's the difference? I think Bafo cable is true bi-directional serial cable.

Tip- Sometimes on PuTTy, changing flow control to 'None' works. Default is 'XON'/'XOFF'.

You can watch video version of this article here- https://youtu.be/CnwNSAOh3Dg
Troubleshooting Console Connectivity on Gateway Leased Line Modem- https://youtu.be/uieZ7Mqg1z8

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