diff --git a/netwerk/base/nsSocketTransport2.cpp b/netwerk/base/nsSocketTransport2.cpp
index 423b2cb7dafe..4d9eec5a72b2 100644
--- a/netwerk/base/nsSocketTransport2.cpp
+++ b/netwerk/base/nsSocketTransport2.cpp
@@ -1205,7 +1205,7 @@ nsSocketTransport::BuildSocket(PRFileDesc *&fd, bool &proxyTransparent, bool &us
         if (NS_FAILED(rv)) {
             SOCKET_LOG(("  error pushing io layer [%u:%s rv=%x]\n", i, mTypes[i], rv));
             if (fd) {
-                PR_Close(fd);
+                CloseSocket(fd, mSocketTransportService->IsTelemetryEnabled());
             }
         }
     }
@@ -1369,7 +1369,7 @@ nsSocketTransport::InitiateSocket()
     // inform socket transport about this newly created socket...
     rv = mSocketTransportService->AttachSocket(fd, this);
     if (NS_FAILED(rv)) {
-        PR_Close(fd);
+        CloseSocket(fd, mSocketTransportService->IsTelemetryEnabled());
         return rv;
     }
     mAttached = true;
@@ -1727,7 +1727,8 @@ public:
 
   NS_IMETHOD Run()
   {
-    PR_Close(mFD);
+    nsSocketTransport::CloseSocket(mFD,
+      gSocketTransportService->IsTelemetryEnabled());
     return NS_OK;
   }
 private:
@@ -1764,7 +1765,7 @@ nsSocketTransport::ReleaseFD_Locked(PRFileDesc *fd)
           SOCKET_LOG(("Intentional leak"));
         } else if (PR_GetCurrentThread() == gSocketThread) {
             SOCKET_LOG(("nsSocketTransport: calling PR_Close [this=%p]\n", this));
-            PR_Close(mFD);
+            CloseSocket(mFD, mSocketTransportService->IsTelemetryEnabled());
         } else {
             // Can't PR_Close() a socket off STS thread. Thunk it to STS to die
             STS_PRCloseOnSocketTransport(mFD);
@@ -3069,6 +3070,29 @@ nsSocketTransport::PRFileDescAutoLock::SetKeepaliveVals(bool aEnabled,
 #endif
 }
 
+void
+nsSocketTransport::CloseSocket(PRFileDesc *aFd, bool aTelemetryEnabled) {
+
+    // We use PRIntervalTime here because we need
+    // nsIOService::LastOfflineStateChange time and
+    // nsIOService::LastConectivityChange time to be atomic.
+    PRIntervalTime closeStarted;
+    if (aTelemetryEnabled) {
+        closeStarted = PR_IntervalNow();
+    }
+
+    PR_Close(aFd);
+
+    if (aTelemetryEnabled) {
+        SendPRBlockingTelemetry(closeStarted,
+            Telemetry::PRCLOSE_TCP_BLOCKING_TIME_NORMAL,
+            Telemetry::PRCLOSE_TCP_BLOCKING_TIME_SHUTDOWN,
+            Telemetry::PRCLOSE_TCP_BLOCKING_TIME_CONNECTIVITY_CHANGE,
+            Telemetry::PRCLOSE_TCP_BLOCKING_TIME_LINK_CHANGE,
+            Telemetry::PRCLOSE_TCP_BLOCKING_TIME_OFFLINE);
+    }
+}
+
 void
 nsSocketTransport::SendPRBlockingTelemetry(PRIntervalTime aStart,
                                            Telemetry::ID aIDNormal,
diff --git a/netwerk/base/nsUDPSocket.cpp b/netwerk/base/nsUDPSocket.cpp
index d8b7c08e3600..108273410cd6 100644
--- a/netwerk/base/nsUDPSocket.cpp
+++ b/netwerk/base/nsUDPSocket.cpp
@@ -784,7 +784,40 @@ nsUDPSocket::CloseSocket()
       // If shutdown last to long, let the socket leak and do not close it.
       UDPSOCKET_LOG(("Intentional leak"));
     } else {
+
+      PRIntervalTime closeStarted = 0;
+      if (gSocketTransportService->IsTelemetryEnabled()) {
+        closeStarted = PR_IntervalNow();
+      }
+
       PR_Close(mFD);
+
+      if (gSocketTransportService->IsTelemetryEnabled()) {
+        PRIntervalTime now = PR_IntervalNow();
+        if (gIOService->IsNetTearingDown()) {
+          Telemetry::Accumulate(Telemetry::PRCLOSE_UDP_BLOCKING_TIME_SHUTDOWN,
+                                PR_IntervalToMilliseconds(now - closeStarted));
+
+        } else if (PR_IntervalToSeconds(now - gIOService->LastConnectivityChange())
+                   < 60) {
+          Telemetry::Accumulate(Telemetry::PRCLOSE_UDP_BLOCKING_TIME_CONNECTIVITY_CHANGE,
+                                PR_IntervalToMilliseconds(now - closeStarted));
+
+        } else if (PR_IntervalToSeconds(now - gIOService->LastNetworkLinkChange())
+                   < 60) {
+          Telemetry::Accumulate(Telemetry::PRCLOSE_UDP_BLOCKING_TIME_LINK_CHANGE,
+                                PR_IntervalToMilliseconds(now - closeStarted));
+
+        } else if (PR_IntervalToSeconds(now - gIOService->LastOfflineStateChange())
+                   < 60) {
+          Telemetry::Accumulate(Telemetry::PRCLOSE_UDP_BLOCKING_TIME_OFFLINE,
+                                PR_IntervalToMilliseconds(now - closeStarted));
+
+        } else {
+          Telemetry::Accumulate(Telemetry::PRCLOSE_UDP_BLOCKING_TIME_NORMAL,
+                                PR_IntervalToMilliseconds(now - closeStarted));
+        }
+      }
     }
     mFD = nullptr;
   }