diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8551a0ccd8b..b871b976065 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -225,6 +225,7 @@ Docs: https://docs.openclaw.ai
 - macOS/browser proxy: serialize non-GET browser proxy request bodies through `AnyCodable.foundationValue` so nested JSON bodies no longer crash the macOS app with `Invalid type in JSON write (__SwiftValue)`. (#43069) Thanks @Effet.
 - CLI/skills tables: keep terminal table borders aligned for wide graphemes, use full reported terminal width, and switch a few ambiguous skill icons to Terminal-safe emoji so `openclaw skills` renders more consistently in Terminal.app and iTerm. Thanks @vincentkoc.
 - Memory/Gemini: normalize returned Gemini embeddings across direct query, direct batch, and async batch paths so memory search uses consistent vector handling for Gemini too. (#43409) Thanks @gumadeiras.
+- Agents/failover: recognize additional serialized network errno strings plus `EHOSTDOWN` and `EPIPE` structured codes so transient transport failures trigger timeout failover more reliably. (#42830) Thanks @jnMetaCode.
 
 ## 2026.3.7
 
diff --git a/src/agents/failover-error.test.ts b/src/agents/failover-error.test.ts
index db01c03d8c4..1548ce5496a 100644
--- a/src/agents/failover-error.test.ts
+++ b/src/agents/failover-error.test.ts
@@ -274,6 +274,8 @@ describe("failover-error", () => {
   it("infers timeout from common node error codes", () => {
     expect(resolveFailoverReasonFromError({ code: "ETIMEDOUT" })).toBe("timeout");
     expect(resolveFailoverReasonFromError({ code: "ECONNRESET" })).toBe("timeout");
+    expect(resolveFailoverReasonFromError({ code: "EHOSTDOWN" })).toBe("timeout");
+    expect(resolveFailoverReasonFromError({ code: "EPIPE" })).toBe("timeout");
   });
 
   it("infers timeout from abort/error stop-reason messages", () => {
diff --git a/src/agents/failover-error.ts b/src/agents/failover-error.ts
index a39685e1b16..8c49df40acb 100644
--- a/src/agents/failover-error.ts
+++ b/src/agents/failover-error.ts
@@ -170,7 +170,9 @@ export function resolveFailoverReasonFromError(err: unknown): FailoverReason | n
       "ECONNREFUSED",
       "ENETUNREACH",
       "EHOSTUNREACH",
+      "EHOSTDOWN",
       "ENETRESET",
+      "EPIPE",
       "EAI_AGAIN",
     ].includes(code)
   ) {
diff --git a/src/agents/pi-embedded-helpers.isbillingerrormessage.test.ts b/src/agents/pi-embedded-helpers.isbillingerrormessage.test.ts
index 27c89afe425..9ed183a6910 100644
--- a/src/agents/pi-embedded-helpers.isbillingerrormessage.test.ts
+++ b/src/agents/pi-embedded-helpers.isbillingerrormessage.test.ts
@@ -535,6 +535,23 @@ describe("isFailoverErrorMessage", () => {
     }
   });
 
+  it("matches network errno codes in serialized error messages", () => {
+    const samples = [
+      "Error: connect ETIMEDOUT 10.0.0.1:443",
+      "Error: connect ESOCKETTIMEDOUT 10.0.0.1:443",
+      "Error: connect EHOSTUNREACH 10.0.0.1:443",
+      "Error: connect ENETUNREACH 10.0.0.1:443",
+      "Error: write EPIPE",
+      "Error: read ENETRESET",
+      "Error: connect EHOSTDOWN 192.168.1.1:443",
+    ];
+    for (const sample of samples) {
+      expect(isTimeoutErrorMessage(sample)).toBe(true);
+      expect(classifyFailoverReason(sample)).toBe("timeout");
+      expect(isFailoverErrorMessage(sample)).toBe(true);
+    }
+  });
+
   it("does not classify MALFORMED_FUNCTION_CALL as timeout", () => {
     const sample = "Unhandled stop reason: MALFORMED_FUNCTION_CALL";
     expect(isTimeoutErrorMessage(sample)).toBe(false);
diff --git a/src/agents/pi-embedded-helpers/failover-matches.ts b/src/agents/pi-embedded-helpers/failover-matches.ts
index a9f16fa6202..ffe0c428f55 100644
--- a/src/agents/pi-embedded-helpers/failover-matches.ts
+++ b/src/agents/pi-embedded-helpers/failover-matches.ts
@@ -37,6 +37,13 @@ const ERROR_PATTERNS = {
     "fetch failed",
     "socket hang up",
     /\beconn(?:refused|reset|aborted)\b/i,
+    /\benetunreach\b/i,
+    /\behostunreach\b/i,
+    /\behostdown\b/i,
+    /\benetreset\b/i,
+    /\betimedout\b/i,
+    /\besockettimedout\b/i,
+    /\bepipe\b/i,
     /\benotfound\b/i,
     /\beai_again\b/i,
     /without sending (?:any )?chunks?/i,