The Bengals don’t want to lose their defensive coordinator. The Redskins have been denied permission to interview Paul Guenther, Jason La Canfora of CBSSports.com tweets. 
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Marvin Lewis is reportedly safe in Cincinnati, but he won’t be getting another extension this offseason, making him a lame duck for 2017. In the past, Guenther has been mentioned as an internal candidate to replace Lewis, meaning that bigger things could be in store for him if the Bengals falter next season.
The Bengals finished the season 6-9-1 and their defensive DVOA (18th in the NFL) admittedly left something to be desired. Still, the Bengals placed better in the previous two seasons under Guenther and he is well-regarded by his players.
Years before he joined the Bengals’ staff, Guenther was an assistant coach with the Redskins in 2002 and 2003. The faces in D.C. have changed quite a few times since then, but owner Dan Snyder presumably has a solid relationship with him.