Man pages matching name warnings::illegalproto in section 3pm:

warnings::illegalproto.3pm.en	debian 10 / libwarnings-illegalproto-perl
warnings::illegalproto.3pm.en	debian 11 / libwarnings-illegalproto-perl
warnings::illegalproto.3pm.en	debian 12 / libwarnings-illegalproto-perl