diff --git a/common/error_code.h b/common/error_code.h
index 252cc42..3dd7402 100644
--- a/common/error_code.h
+++ b/common/error_code.h
@@ -80,6 +80,9 @@
   kRollbackNotPossible = 54,
   kFirstActiveOmahaPingSentPersistenceError = 55,
   kVerityCalculationError = 56,
+  kInternalLibCurlError = 57,
+  kUnresolvedHostError = 58,
+  kUnresolvedHostRecovered = 59,
 
   // VERY IMPORTANT! When adding new error codes:
   //
diff --git a/common/error_code_utils.cc b/common/error_code_utils.cc
index b0bbbd4..5bcbaa4 100644
--- a/common/error_code_utils.cc
+++ b/common/error_code_utils.cc
@@ -161,6 +161,12 @@
       return "ErrorCode::kFirstActiveOmahaPingSentPersistenceError";
     case ErrorCode::kVerityCalculationError:
       return "ErrorCode::kVerityCalculationError";
+    case ErrorCode::kInternalLibCurlError:
+      return "ErrorCode::kInternalLibCurlError";
+    case ErrorCode::kUnresolvedHostError:
+      return "ErrorCode::kUnresolvedHostError";
+    case ErrorCode::kUnresolvedHostRecovered:
+      return "ErrorCode::kUnresolvedHostRecovered";
       // Don't add a default case to let the compiler warn about newly added
       // error codes which should be added here.
   }
diff --git a/metrics_constants.h b/metrics_constants.h
index eabb8fb..137143a 100644
--- a/metrics_constants.h
+++ b/metrics_constants.h
@@ -60,6 +60,15 @@
   // above block and before the kInputMalformed field. This
   // is to ensure that error codes are not reordered.
 
+  // This error is reported when libcurl returns CURLE_COULDNT_RESOLVE_HOST and
+  // calling res_init() can recover.
+  kUnresolvedHostRecovered = 97,
+  // This error is reported when libcurl returns CURLE_COULDNT_RESOLVE_HOST.
+  kUnresolvedHostError = 98,
+  // This error is reported when libcurl has an internal error that
+  // update_engine can't recover from.
+  kInternalLibCurlError = 99,
+
   // This error code is used to convey that malformed input was given
   // to the utils::GetDownloadErrorCode() function. This should never
   // happen but if it does it's because of an internal update_engine
diff --git a/metrics_utils.cc b/metrics_utils.cc
index 070626a..ca3b5c9 100644
--- a/metrics_utils.cc
+++ b/metrics_utils.cc
@@ -43,6 +43,9 @@
       return metrics::AttemptResult::kUpdateSucceededNotActive;
 
     case ErrorCode::kDownloadTransferError:
+    case ErrorCode::kInternalLibCurlError:
+    case ErrorCode::kUnresolvedHostError:
+    case ErrorCode::kUnresolvedHostRecovered:
       return metrics::AttemptResult::kPayloadDownloadError;
 
     case ErrorCode::kDownloadInvalidMetadataSize:
@@ -168,6 +171,13 @@
     case ErrorCode::kDownloadTransferError:
       return metrics::DownloadErrorCode::kDownloadError;
 
+    case ErrorCode::kInternalLibCurlError:
+      return metrics::DownloadErrorCode::kInternalLibCurlError;
+    case ErrorCode::kUnresolvedHostError:
+      return metrics::DownloadErrorCode::kUnresolvedHostError;
+    case ErrorCode::kUnresolvedHostRecovered:
+      return metrics::DownloadErrorCode::kUnresolvedHostRecovered;
+
     // All of these error codes are not related to downloading so break
     // out so we can warn and return InputMalformed.
     case ErrorCode::kSuccess:
diff --git a/payload_state.cc b/payload_state.cc
index a6c3620..355552e 100644
--- a/payload_state.cc
+++ b/payload_state.cc
@@ -365,6 +365,9 @@
     case ErrorCode::kNoUpdate:
     case ErrorCode::kRollbackNotPossible:
     case ErrorCode::kFirstActiveOmahaPingSentPersistenceError:
+    case ErrorCode::kInternalLibCurlError:
+    case ErrorCode::kUnresolvedHostError:
+    case ErrorCode::kUnresolvedHostRecovered:
       LOG(INFO) << "Not incrementing URL index or failure count for this error";
       break;
 
diff --git a/update_manager/chromeos_policy.cc b/update_manager/chromeos_policy.cc
index bdb88f8..8056f06 100644
--- a/update_manager/chromeos_policy.cc
+++ b/update_manager/chromeos_policy.cc
@@ -149,6 +149,9 @@
     case ErrorCode::kNoUpdate:
     case ErrorCode::kRollbackNotPossible:
     case ErrorCode::kFirstActiveOmahaPingSentPersistenceError:
+    case ErrorCode::kInternalLibCurlError:
+    case ErrorCode::kUnresolvedHostError:
+    case ErrorCode::kUnresolvedHostRecovered:
       LOG(INFO) << "Not changing URL index or failure count due to error "
                 << chromeos_update_engine::utils::ErrorCodeToString(err_code)
                 << " (" << static_cast<int>(err_code) << ")";