The RPC server is unavailable. 0x800706ba (WIN32: 1722 RPC_S_SERVER_UNAVAILABLE) - From DC to CA

Question

The RPC server is unavailable. 0x800706ba (WIN32: 1722 RPC_S_SERVER_UNAVAILABLE) - From DC to CA

xexon-0199 20

Hi, I got the following error The RPC server is unavailable. 0x800706ba (WIN32: 1722 RPC_S_SERVER_UNAVAILABLE) when I try enroll a certificate from Domain Controller to CA Server.

I was reading posts like: [https://learn.microsoft.com/en-us/answers/questions/743186/the-rpc-server-is-unavailable-0x800706ba-(win32-17](https://learn.microsoft.com/en-us/answers/questions/743186/the-rpc-server-is-unavailable-0x800706ba-(win32-17)

But nothing working for me now.

-Ping from DC to CA Server its Working and ping from CA Server to DC.

-Firewalls its turn off in both sides.

-RPC service its working and running in the DC.

From DC to CA:

Looking for the event views i found this that its the main reason about the problem

Also, I added the group "Domain Controllers" to the local group "Certificate Service DCOM Access" I saw in this post https://social.technet.microsoft.com/Forums/en-US/c0d13777-3f1b-4805-94a2-ac56f3cecbf3/r2-ad-certificate-services-running-on-dc-cant-issue-to-r2win7-clients?forum=windowsserver2008r2general

If I enroll a cert from an other machine its working correctly. (Windows 10 machine cert enroll to CA Server working correctly)

Best Regards, I hope I can fix this error because I dont know whats happens.

Answer 1

Thameur-BOURBITA 15,816

Hi @Anonymous

It seems that the RPC port 135 TCP and dynamic ports required for certificate enrollement are not opened between domain controller where you have the RPC error and PKI.

You can use the following tools to check the statut of RPC port:

PortQryUI - User Interface for the PortQry Command Line Port Scanner

Please don't forget to mark helpful answer as accepted

xexon-0199 20 Reputation points

2023-02-26T19:19:43.7733333+00:00

Hi @Thameur-BOURBITA can you give me some tips to fix the error? I mean, all firewalls are turn off and I can enroll certificates from any workstation but not from domain controller where the firewall its turn off too.

Thats the output:

Best Regards!
Thameur-BOURBITA 15,816 Reputation points

2023-02-26T20:17:42.6966667+00:00

If windows firewall is disabled, it should be a firewall device configured on a your network .

try to use the tools provided in the link in my previous answer to check if the RPC port is opened between impacted DC and your CA
xexon-0199 20 Reputation points

2023-02-27T08:19:45.4966667+00:00

Hi @Thameur-BOURBITA

Thats the output executing the tool that u told me, its the same result if I put the CA server, in this case its the DC.

=============================================

Starting portqry.exe -n 192.168.1.191 -e 135 -p TCP ...

Querying target system called:

192.168.1.191

Attempting to resolve IP address to a name...

IP address resolved to DC-1

querying...

TCP port 135 (epmap service): LISTENING

Using ephemeral source port

Querying Endpoint Mapper Database...

Server's response:

UUID: d95afe70-a6d5-4259-822e-2c84da1ddb0d

ncacn_ip_tcp:192.168.1.191[49664]

UUID: 897e2e5f-93f3-4376-9c9c-fd2277495c27 Frs2 Service

ncacn_ip_tcp:192.168.1.191[49724]

UUID: 50abc2a4-574d-40b3-9d66-ee4fd5fba076

ncacn_ip_tcp:192.168.1.191[49693]

UUID: 367abb81-9844-35f1-ad32-98f038001003

ncacn_ip_tcp:192.168.1.191[49677]

UUID: 650a7e26-eab8-5533-ce43-9c1dfce11511 Vpn APIs

ncacn_np:192.168.1.191[\PIPE\ROUTER]

UUID: 12345678-1234-abcd-ef00-0123456789ab

ncacn_ip_tcp:192.168.1.191[49674]

UUID: 0b6edbfa-4a24-4fc6-8a23-942b1eca65d1

ncacn_ip_tcp:192.168.1.191[49674]

UUID: ae33069b-a2a8-46ee-a235-ddfd339be281

ncacn_ip_tcp:192.168.1.191[49674]

UUID: 4a452661-8290-4b36-8fbe-7f4093a94978

ncacn_ip_tcp:192.168.1.191[49674]

UUID: 76f03f96-cdfd-44fc-a22c-64950a001209

ncacn_ip_tcp:192.168.1.191[49674]

UUID: c9ac6db5-82b7-4e55-ae8a-e464ed7b4277 Impl friendly name

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: c9ac6db5-82b7-4e55-ae8a-e464ed7b4277 Impl friendly name

ncacn_ip_tcp:192.168.1.191[49667]

UUID: e3514235-4b06-11d1-ab04-00c04fc2dcd2 MS NT Directory DRS Interface

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: e3514235-4b06-11d1-ab04-00c04fc2dcd2 MS NT Directory DRS Interface

ncacn_ip_tcp:192.168.1.191[49667]

UUID: e3514235-4b06-11d1-ab04-00c04fc2dcd2 MS NT Directory DRS Interface

ncacn_http:192.168.1.191[49671]

UUID: e3514235-4b06-11d1-ab04-00c04fc2dcd2 MS NT Directory DRS Interface

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: f5cc5a18-4264-101a-8c59-08002b2f8426 MS NT Directory NSP Interface

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: f5cc5a18-4264-101a-8c59-08002b2f8426 MS NT Directory NSP Interface

ncacn_ip_tcp:192.168.1.191[49667]

UUID: f5cc5a18-4264-101a-8c59-08002b2f8426 MS NT Directory NSP Interface

ncacn_http:192.168.1.191[49671]

UUID: f5cc5a18-4264-101a-8c59-08002b2f8426 MS NT Directory NSP Interface

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: 12345778-1234-abcd-ef00-0123456789ab

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: 12345778-1234-abcd-ef00-0123456789ab

ncacn_ip_tcp:192.168.1.191[49667]

UUID: 12345778-1234-abcd-ef00-0123456789ab

ncacn_http:192.168.1.191[49671]

UUID: 12345778-1234-abcd-ef00-0123456789ab

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: 12345778-1234-abcd-ef00-0123456789ac

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: 12345778-1234-abcd-ef00-0123456789ac

ncacn_ip_tcp:192.168.1.191[49667]

UUID: 12345778-1234-abcd-ef00-0123456789ac

ncacn_http:192.168.1.191[49671]

UUID: 12345778-1234-abcd-ef00-0123456789ac

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: 12345778-1234-abcd-ef00-0123456789ac

ncacn_ip_tcp:192.168.1.191[49672]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_ip_tcp:192.168.1.191[49667]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_http:192.168.1.191[49671]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_ip_tcp:192.168.1.191[49672]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_ip_tcp:192.168.1.191[49667]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_http:192.168.1.191[49671]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: 0b1c2170-5732-4e0e-8cd3-d9b16f3b84d7 RemoteAccessCheck

ncacn_ip_tcp:192.168.1.191[49672]

UUID: 12345678-1234-abcd-ef00-01234567cffb

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: 12345678-1234-abcd-ef00-01234567cffb

ncacn_ip_tcp:192.168.1.191[49667]

UUID: 12345678-1234-abcd-ef00-01234567cffb

ncacn_http:192.168.1.191[49671]

UUID: 12345678-1234-abcd-ef00-01234567cffb

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: 12345678-1234-abcd-ef00-01234567cffb

ncacn_ip_tcp:192.168.1.191[49672]

UUID: b25a52bf-e5dd-4f4a-aea6-8ca7272a0e86 KeyIso

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: b25a52bf-e5dd-4f4a-aea6-8ca7272a0e86 KeyIso

ncacn_ip_tcp:192.168.1.191[49667]

UUID: b25a52bf-e5dd-4f4a-aea6-8ca7272a0e86 KeyIso

ncacn_http:192.168.1.191[49671]

UUID: b25a52bf-e5dd-4f4a-aea6-8ca7272a0e86 KeyIso

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: b25a52bf-e5dd-4f4a-aea6-8ca7272a0e86 KeyIso

ncacn_ip_tcp:192.168.1.191[49672]

UUID: 8fb74744-b2ff-4c00-be0d-9ef9a191fe1b Ngc Pop Key Service

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: 8fb74744-b2ff-4c00-be0d-9ef9a191fe1b Ngc Pop Key Service

ncacn_ip_tcp:192.168.1.191[49667]

UUID: 8fb74744-b2ff-4c00-be0d-9ef9a191fe1b Ngc Pop Key Service

ncacn_http:192.168.1.191[49671]

UUID: 8fb74744-b2ff-4c00-be0d-9ef9a191fe1b Ngc Pop Key Service

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: 8fb74744-b2ff-4c00-be0d-9ef9a191fe1b Ngc Pop Key Service

ncacn_ip_tcp:192.168.1.191[49672]

UUID: 51a227ae-825b-41f2-b4a9-1ac9557a1018 Ngc Pop Key Service

ncacn_np:192.168.1.191[\pipe\lsass]

UUID: 51a227ae-825b-41f2-b4a9-1ac9557a1018 Ngc Pop Key Service

ncacn_ip_tcp:192.168.1.191[49667]

UUID: 51a227ae-825b-41f2-b4a9-1ac9557a1018 Ngc Pop Key Service

ncacn_http:192.168.1.191[49671]

UUID: 51a227ae-825b-41f2-b4a9-1ac9557a1018 Ngc Pop Key Service

ncacn_np:192.168.1.191[\pipe\b67e98146d26edb4]

UUID: 51a227ae-825b-41f2-b4a9-1ac9557a1018 Ngc Pop Key Service

ncacn_ip_tcp:192.168.1.191[49672]

UUID: 6b5bdd1e-528c-422c-af8c-a4079be4fe48 Remote Fw APIs

ncacn_ip_tcp:192.168.1.191[49670]

UUID: 7f1343fe-50a9-4927-a778-0c5859517bac DfsDs service

ncacn_np:192.168.1.191[\PIPE\wkssvc]

UUID: 1ff70682-0a51-30e8-076d-740be8cee98b

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: 378e52b0-c0a9-11cf-822d-00aa0051e40f

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: 33d84484-3626-47ee-8c6f-e7e98b113be1

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: 86d35949-83c9-4044-b424-db363231fd0c

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: 86d35949-83c9-4044-b424-db363231fd0c

ncacn_ip_tcp:192.168.1.191[49666]

UUID: 3a9ef155-691d-4449-8d05-09ad57031823

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: 3a9ef155-691d-4449-8d05-09ad57031823

ncacn_ip_tcp:192.168.1.191[49666]

UUID: b18fbab6-56f8-4702-84e0-41053293a869 UserMgrCli

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: b18fbab6-56f8-4702-84e0-41053293a869 UserMgrCli

ncacn_ip_tcp:192.168.1.191[49666]

UUID: 0d3c7f20-1c8d-4654-a1b3-51563b298bda UserMgrCli

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: 0d3c7f20-1c8d-4654-a1b3-51563b298bda UserMgrCli

ncacn_ip_tcp:192.168.1.191[49666]

UUID: 552d076a-cb29-4e44-8b6a-d15e59e2c0af IP Transition Configuration endpoint

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: 552d076a-cb29-4e44-8b6a-d15e59e2c0af IP Transition Configuration endpoint

ncacn_ip_tcp:192.168.1.191[49666]

UUID: 2e6035b2-e8f1-41a7-a044-656b439c4c34 Proxy Manager provider server endpoint

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: 2e6035b2-e8f1-41a7-a044-656b439c4c34 Proxy Manager provider server endpoint

ncacn_ip_tcp:192.168.1.191[49666]

UUID: c36be077-e14b-4fe9-8abc-e856ef4f048b Proxy Manager client server endpoint

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: c36be077-e14b-4fe9-8abc-e856ef4f048b Proxy Manager client server endpoint

ncacn_ip_tcp:192.168.1.191[49666]

UUID: c49a5a70-8a7f-4e70-ba16-1e8f1f193ef1 Adh APIs

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: c49a5a70-8a7f-4e70-ba16-1e8f1f193ef1 Adh APIs

ncacn_ip_tcp:192.168.1.191[49666]

UUID: a398e520-d59a-4bdd-aa7a-3c1e0303a511 IKE/Authip API

ncacn_np:192.168.1.191[\PIPE\atsvc]

UUID: a398e520-d59a-4bdd-aa7a-3c1e0303a511 IKE/Authip API

ncacn_ip_tcp:192.168.1.191[49666]

UUID: f6beaff7-1e19-4fbb-9f8f-b89e2018337c Event log TCPIP

ncacn_np:192.168.1.191[\pipe\eventlog]

UUID: f6beaff7-1e19-4fbb-9f8f-b89e2018337c Event log TCPIP

ncacn_ip_tcp:192.168.1.191[49665]

UUID: 3473dd4d-2e88-4006-9cba-22570909dd10 WinHttp Auto-Proxy Service

ncacn_np:192.168.1.191[\pipe\eventlog]

UUID: 3473dd4d-2e88-4006-9cba-22570909dd10 WinHttp Auto-Proxy Service

ncacn_ip_tcp:192.168.1.191[49665]

UUID: 2d98a740-581d-41b9-aa0d-a88b9d5ce938

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 8bfc3be1-6def-4e2d-af74-7c47cd0ade4a

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 1b37ca91-76b1-4f5e-a3c7-2abfc61f2bb0

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: c605f9fb-f0a3-4e2a-a073-73560f8d9e3e

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 0d3e2735-cea0-4ecc-a9e2-41a2d81aed4e

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 2513bcbe-6cd4-4348-855e-7efb3c336dd3

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 20c40295-8dba-48e6-aebf-3e78ef3bb144

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: b8cadbaf-e84b-46b9-84f2-6f71c03f9e55

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 857fb1be-084f-4fb5-b59c-4b2c4be5f0cf

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 55e6b932-1979-45d6-90c5-7f6270724112

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 76c217bc-c8b4-4201-a745-373ad9032b1a

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 88abcbc3-34ea-76ae-8215-767520655a23

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: d09bdeb5-6171-4a34-bfe2-06fa82652568

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 9b008953-f195-4bf9-bde0-4471971e58ed

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: d09bdeb5-6171-4a34-bfe2-06fa82652568

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 697dcda9-3ba9-4eb2-9247-e11f1901b0d2

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: d09bdeb5-6171-4a34-bfe2-06fa82652568

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: fc48cd89-98d6-4628-9839-86f7a3e4161a

ncacn_np:192.168.1.191[\pipe\LSM_API_service]

UUID: 76f226c3-ec14-4325-8a99-6a46348418af

ncacn_np:192.168.1.191[\PIPE\InitShutdown]

UUID: d95afe70-a6d5-4259-822e-2c84da1ddb0d

ncacn_np:192.168.1.191[\PIPE\InitShutdown]

Total endpoints found: 106

==== End of RPC Endpoint Mapper query response ====

portqry.exe -n 192.168.1.191 -e 135 -p TCP exits with return code 0x00000000.

The RPC server is unavailable. 0x800706ba (WIN32: 1722 RPC_S_SERVER_UNAVAILABLE) - From DC to CA

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