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1# mDNS Error Codes
2
3> **NOTE**
4>
5> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](errorcode-universal.md).
6
7## 2100002 Service Connection Failure
8
9**Error Message**
10
11Operation failed. Cannot connect to service.
12
13**Description**
14
15This error code is reported if a service connection failure occurs.
16
17**Possible Causes**
18
19The service is abnormal.
20
21**Procedure**
22
23Check whether system services are running properly.
24
25## 2100003 System Internal Error
26
27**Error Message**
28
29System internal error.
30
31**Description**
32
33This error code is reported if a system internal error occurs.
34
35**Possible Causes**
36
371. The memory is abnormal.
38
392. A null pointer is present.
40
41**Procedure**
42
431. Check whether the memory space is sufficient. If not, clear the memory and try again.
44
452. Check whether the system is normal. If not, try again later or restart the device.
46
47## 2204003 Repeated Registration
48
49**Error Message**
50
51Callback duplicated.
52
53**Description**
54
55The callback already exists.
56
57**Possible Causes**
58
59An mDNS service with the same name and type is repeatedly registered.
60
61**Procedure**
62
63Check whether the mDNS service to be registered already exists.
64
65## 2204008 Service Deletion Failure
66
67**Error Message**
68
69Service instance duplicated.
70
71**Description**
72
73The service to be removed does not exist.
74
75**Possible Causes**
76
77The service has been deleted.
78
79**Procedure**
80
81Check whether the mDNS service to be deleted exists.
82
83## 2204010 Message Sending Failure
84
85**Error Message**
86
87Send packet failed.
88
89**Description**
90
91Messages fail to be sent through an mDNS service.
92
93**Possible Causes**
94
95The mDNS service does not exist on the LAN.
96
97**Procedure**
98
99Check whether the target mDNS service exists on the LAN.
100
101## 2204006 Service Resolution Timeout
102
103**Error Message**
104
105Request timeout.
106
107**Description**
108
109mDNS services of the specified type fail to be resolved.
110
111**Possible Causes**
112
113mDNS services of the specified type do not exist on the LAN.
114
115**Procedure**
116
117Check whether mDNS services of the specified type exist on the LAN.
118