diff --git a/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/common/process/ContinuousProcess.java b/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/common/process/ContinuousProcess.java
index f61ce80a..e7a371d4 100644
--- a/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/common/process/ContinuousProcess.java
+++ b/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/common/process/ContinuousProcess.java
@@ -64,6 +64,15 @@ public String readErrorLine(){
         }
     }
 
+    public String readErrorLines(){
+        StringBuilder sb = new StringBuilder();
+        String line;
+        while((line = readErrorLine()) != null){
+            sb.append(line).append("\n");
+        }
+        return sb.toString();
+    }
+
     public boolean isAlive(){
         return this.process.isAlive();
     }
diff --git a/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/arp/ArpLogWriter.java b/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/arp/ArpLogWriter.java
index 0af0b891..bb381f79 100644
--- a/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/arp/ArpLogWriter.java
+++ b/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/arp/ArpLogWriter.java
@@ -14,6 +14,7 @@
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
+//TODO: 에러 로그 어떻게 관리할지 생각. 일단 TransientProcess라서 구현 안함
 @Slf4j
 @Component
 public class ArpLogWriter {
diff --git a/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/mdns/MdnsLogWriter.java b/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/mdns/MdnsLogWriter.java
index 0def7ecc..d7d4296f 100644
--- a/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/mdns/MdnsLogWriter.java
+++ b/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/mdns/MdnsLogWriter.java
@@ -7,16 +7,17 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
+//TODO: tshark가 종료되지 않더라도 오류가 발생할 수 있으려나? 이 경우에도 로깅이 필요하긴 함
 @Slf4j
 @Component
 public class MdnsLogWriter {
     private final Map<ManagedInfo, MdnsLogProcess> processes;
+    private final Map<ManagedInfo, Boolean> wasDead;
     private final MdnsLogParser parser;
     private final ManagedLogDAO dao;
     private final String sudoPassword;
@@ -25,11 +26,13 @@ public MdnsLogWriter(ManagedLogDAO dao, MdnsLogParser parser, NetworkConfig conf
         this.dao = dao;
         this.parser = parser;
         this.sudoPassword = sudoPassword;
-        this.processes = config.getMdnsList().parallelStream()
-                .collect(Collectors.toMap(
-                        managedInfo -> managedInfo,
-                        managedInfo -> new MdnsLogProcess(managedInfo, sudoPassword)
-                ));
+        this.processes = new HashMap<>();
+        this.wasDead = new HashMap<>();
+        config.getMdnsList().parallelStream()
+                .forEach(managedInfo -> {
+                    this.processes.put(managedInfo, new MdnsLogProcess(managedInfo, sudoPassword));
+                    this.wasDead.put(managedInfo, false);
+                });
     }
 
     @Scheduled(initialDelay = 10000, fixedDelay = 10000)
@@ -39,7 +42,10 @@ private void writeLogs() {
                     ManagedInfo managedInfo = entry.getKey();
                     MdnsLogProcess process = entry.getValue();
                     boolean alive = process.isAlive();
-                    if (!alive) log.error("[managed - mdns({})] dead", managedInfo.ssid());
+                    if (!alive && wasDead.get(managedInfo).equals(Boolean.FALSE)) {
+                        wasDead.put(managedInfo, true);
+                        log.error("[managed - mdns({})] dead :\n{}", managedInfo.ssid(), process.readErrorLines());
+                    }
                     return alive;})
                 .flatMap(entry -> {
                     ManagedInfo managedInfo = entry.getKey();
diff --git a/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/monitor/MonitorLogWriter.java b/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/monitor/MonitorLogWriter.java
index 8b3096a3..365c77c3 100644
--- a/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/monitor/MonitorLogWriter.java
+++ b/modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/monitor/MonitorLogWriter.java
@@ -12,6 +12,7 @@
 @Component
 public class MonitorLogWriter {
     private MonitorLogProcess process; //교체될 수 있으므로 final X
+    private Boolean wasDead = false;
     private final MonitorLogParser parser;
     private final MonitorLogDAO repo;
     private final String sudoPassword;
@@ -27,7 +28,10 @@ public MonitorLogWriter(MonitorLogParser parser, MonitorLogDAO repo, NetworkConf
     @Scheduled(initialDelay = 10000, fixedDelay = 10000)
     private void saveLogs(){
         if (!process.isAlive()) {
-            log.error("[monitor] dead");
+            if (wasDead.equals(Boolean.FALSE)) {
+                log.error("[monitor] dead:\n{}", process.readErrorLines());
+                wasDead = true;
+            }
             return;
         }
         Set<String> macs = new HashSet<>();