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I own the TP-Link TL-WR841N v9 with the latest firmware (TL-WR841ND_V9_150310) but I cannot access the webadmin from Google Chrome and from Safari on OS X. After clicking on the "Login" button it redirects me to an empty page (url: http://192.168.0.1/FUFBRFPADUDCAKSA/userRpm/Index.htm) and Chrome console says:

Failed to load resource: the server responded with a status of 413 (N/A) (char_set.js)
Failed to load resource: net::ERR_INCOMPLETE_CHUNKED_ENCODING (Index.htm)
Failed to load resource: the server responded with a status of 413 (N/A) (char_set.js)



I can access the webadmin only from Firefox, but is very very laggy. I tried factory reset of the router, but it didn't help. I also tried a different MacBook - same problem.