MEMORANDUM **

California state prisoner David Estrada appeals pro se from the district court’s summary judgment in his 42 U.S.C. § 1983 action alleging constitutional violations. We have jurisdiction under 28 U.S.C. § 1291. We review de novo. Toguchi v. Chung, 391 F.3d 1051, 1056 (9th Cir. 2004). We affirm.

The district court properly granted summary judgment on Estrada’s failure to protect claim against defendants Espinosa, Gipson, Lambert, and Cavazos because Estrada failed to raise a genuine dispute of material fact as to whether these defendants were deliberately indifferent to a threat to Estrada’s safety. See Farmer v. *770 Brennan, 511 U.S. 825, 837, 114 S.Ct. 1970, 128 L.Ed.2d 811 (1994) (a prison official is deliberately indifferent only if he “knows of and disregards an excessive risk to inmate ... safety”); Starr v. Baca, 652 F.3d 1202, 1207-8 (9th Cir. 2011) (requirements for establishing supervisory liability).

The district court properly granted summary judgment on Estrada’s retaliation claim against defendants Espinosa and Gipson because Estrada failed to raise a genuine dispute of material fact as to whether these defendants’ actions did not advance a legitimate correctional purpose, See Rhodes v. Robinson, 408 F.3d 559, 567-68 (9th Cir. 2005) (setting forth the elements of a retaliation claim in the prison context).

We do not consider matters not specifically and distinctly raised and argued in the opening brief, including Estrada’s reference to the district court’s discovery orders. See Padgett v. Wright, 587 F.3d 983, 985 n.2 (9th Cir. 2009).

We do not consider Estrada’s arguments regarding the district court’s screening order. See Smith v. Marsh, 194 F.3d 1045, 1052 (9th Cir. 1999) (matters not properly raised before the district court are waived).

AFFIRMED.