diff --git a/src/avalanche/peermanager.h b/src/avalanche/peermanager.h
--- a/src/avalanche/peermanager.h
+++ b/src/avalanche/peermanager.h
@@ -174,6 +174,11 @@
      */
     std::unordered_set<ProofId, SaltedProofIdHasher> m_unbroadcast_proofids;
 
+    /**
+     * Track proof ids from conflicting proofs
+     */
+    std::unordered_set<ProofId, SaltedProofIdHasher> m_conflicting_proofids;
+
 public:
     class ConflictingProofHandler {
     public:
@@ -185,10 +190,12 @@
     std::unordered_set<std::shared_ptr<ConflictingProofHandler>>
         conflictingProofHandlers;
 
-    /** Conflicting proof callback */
+    /** Conflicting proofs API */
     std::unique_ptr<interfaces::Handler>
     handleConflictingProof(std::shared_ptr<ConflictingProofHandler> handler);
 
+    bool isConflictingProof(const ProofId &proofid) const;
+
     /**
      * Node API.
      */
diff --git a/src/avalanche/peermanager.cpp b/src/avalanche/peermanager.cpp
--- a/src/avalanche/peermanager.cpp
+++ b/src/avalanche/peermanager.cpp
@@ -45,6 +45,10 @@
                                                          std::move(handler));
 }
 
+bool PeerManager::isConflictingProof(const ProofId &proofid) const {
+    return !!m_conflicting_proofids.count(proofid);
+}
+
 bool PeerManager::addNode(NodeId nodeid, const ProofId &proofid) {
     auto &pview = peers.get<proof_index>();
     auto it = pview.find(proofid);
@@ -337,6 +341,8 @@
             }
         }
 
+        m_conflicting_proofids.insert(proofid);
+
         for (auto &cb : conflictingProofHandlers) {
             cb->onConflictingProof(proof, accepted);
         }
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -4458,11 +4458,12 @@
             LogPrint(BCLog::NET, "New avalanche proof: peer=%d, proofid %s\n",
                      nodeid, proofid.ToString());
         } else {
-            // If the proof couldn't be added, it can be either orphan or
+            // If the proof couldn't be added, it can be orphan, conflicting or
             // invalid. In the latter case we should increase the ban score.
             // TODO improve the ban reason by printing the validation state
             if (!g_avalanche->withPeerManager([&](avalanche::PeerManager &pm) {
-                    return pm.getOrphan(proofid);
+                    return pm.getOrphan(proofid) ||
+                           pm.isConflictingProof(proofid);
                 })) {
                 WITH_LOCK(cs_rejectedProofs, rejectedProofs->insert(proofid));
                 Misbehaving(nodeid, 100, "invalid-avaproof");
diff --git a/test/functional/abc_p2p_avalanche_proof_voting.py b/test/functional/abc_p2p_avalanche_proof_voting.py
--- a/test/functional/abc_p2p_avalanche_proof_voting.py
+++ b/test/functional/abc_p2p_avalanche_proof_voting.py
@@ -93,6 +93,16 @@
         # Conflicting proof with lower sequence number
         check_proof_is_polled(proofid_seq10, proof_seq10)
 
+        self.log.info(
+            "Check the node will poll for conflicting proofs received via p2p")
+
+        proofid_seq40, proof_seq40 = get_proof_with_sequence_number(40)
+        peer = get_ava_p2p_interface(node)
+        peer.send_avaproof(proof_seq40)
+
+        check_proof_is_polled(proofid_seq40, proof_seq40)
+        assert peer.is_connected
+
 
 if __name__ == '__main__':
     AvalancheProofVotingTest().main()
diff --git a/test/functional/test_framework/avatools.py b/test/functional/test_framework/avatools.py
--- a/test/functional/test_framework/avatools.py
+++ b/test/functional/test_framework/avatools.py
@@ -23,6 +23,7 @@
     hash256,
     msg_avahello,
     msg_avapoll,
+    msg_avaproof,
     msg_tcpavaresponse,
 )
 from .p2p import P2PInterface, p2p_lock
@@ -241,6 +242,15 @@
 
         return delegation.proofid
 
+    def send_avaproof(self, proof_hex: str) -> int:
+        proof = FromHex(AvalancheProof(), proof_hex)
+
+        msg = msg_avaproof()
+        msg.proof = proof
+        self.send_message(msg)
+
+        return proof.proofid
+
 
 def get_ava_p2p_interface(
         node: TestNode,