Windows Server Troubleshooting: . The RPC protocol is based on a client/server model. The client makes a procedure call that appears to be local but is. During this process, the procedure call arguments are bundled and passed through the network to the server. The arguments are then unpacked and run on the server.

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The result is again bundled and passed back to the client. RPC is used by several components in Windows Server, such as the File Replication Service (FRS), Active Directory Replication, Certificate services, DCOM, domain join, DCPromo and RDP, NLB and Cluster, Microsoft Operations Master, Exchange and SQL. The RPC Server. An RPC server is a communications interface provided by an application or service that allows remote clients to connect, pass commands, and transfer data using the RPC protocol. A typical example of an RPC server is Microsoft Exchange Server. Microsoft Exchange. Server is an application running on a computer that supplies an RPC communications interface for an RPC client. An application will register its RPC server with the operating system’s End Point Mapper (EPM) service so that the remote client can locate the RPC server.

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• Introduction. Remote Procedure Call (RPC) is an inter-process communication technique to allow client and server software to communicate on a network.

When the application registers with the EPM it will indicate the IP address and TCP port that it is. An example of a typical RPC client is the Microsoft Outlook application. The RPC service or related services may not be running. File and printer sharing is not enabled. To verify that a domain controller can be located for a specific domain, run the command below.

Servers should not be pointing to their ISP's DNS servers in the preferred or alternate DNS server portion of the TCP/IP. The ISP's DNS servers should only be used as forwarders in DNS. Find the host (A) resource record registration for this server on each of the other replication partner domain controllers. The Net. BIOS over TCP/IP setting should be either enabled or default (use DHCP). DNS names that do not contain a suffix such as . DNS names. Microsoft doesn't recommend using single label domain names because. Internet registrar and domain members do not perform dynamic updates to single- label DNS zones.

Knowledge base article. If you make any changes to the RPC service or to the RPC Locator service settings, restart the computer, and then test for the problem again.

These services should both be set to automatic and started. The Kerberos Key. Distribution Center (KDC) should be Started and Automatic on Windows 2. Windows 2. 00. 3 DCs.

It should not be started and set to Disabled in all other cases. Clients connect to RPC Endpoint Mapper on port 1.

RPC Endpoint Mapper then tells the client which randomly assigned port between 1. Ports may be blocked by a hardware firewall or a software firewall. Software firewalls include Internet Connection Firewall on computers running Windows Server 2. Windows XP, and Windows Firewall on computers running Windows Vista, Windows 7, Windows. Server 2. 00. 8 and Windows Server 2. R2. A computer might also have third- party firewall software installed, or antivirus software with built- in firewall functionality. By default, port 1.

TCP/UDP and ports 1. TCP must be open for RPC to work. You. can restrict the ports greater than 1. RPC uses. However, RPC Endpoint Mapper is always on port 1. File and Printer Sharing is not enabled. The Yum Utility Failed To Install The Required Packages R on this page.

File and Printer sharing for Microsoft Networks will produce the error . See the following example: Unable to open service control manager database on \\< computer>. Error 1. 72. 2: The RPC server is unavailable. This error message may occur if the File and Printer Sharing for Microsoft Networks component is not enabled on the remote computer. Troubleshooting RPCThe process of an RPC client connecting to an RPC server can be broken down into four phases. This troubleshooting guide will discuss the events that occur at each phase, how to test these events, and how to identify if the phase completed successfully.

Phase 1: Name Resolution: Name resolution is the act of resolving a name to an IP address. This normally takes two forms: Net. BIOS Name Resolution or the more common DNS Name Resolution. Phase 2: TCP session establishment: TCP session establishment is the act of establishing a TCP connection between the RPC client and the RPC server. TCP sessions will be initiated by the RPC client via a TCP 3- way handshake with the RPC.

Phase 3: RPC Discovery: When a client wants to connect to the RPC server supplied by the application it will contact the computer that hosts the RPC Server and discover how to connect to the RPC Server. Phase 4: RPC Communication: RPC Communication is the act of making RPC requests to the application endpoint and receiving RPC responses from this application. Identify the client and server computers reporting the RPC error. Identify the DNS and WINS servers used by these computers. To do this. On each machine, open a command prompt and run ipconfig /all. Identify the DNS servers and WINS servers that the RPC client is configured to use. From a command prompt on the client run ipconfig /flushdns and nbtstat –R to clear the name resolution caches.

Stop the traces and save them. Name Resolution. Name Resolution consists of one or possibly more Net. BIOS or DNS queries to locate the IP address for the RPC Server. Troubleshooting this phase requires verifying that a response is received to the name resolution request and that the response contains the. IP address for the RPC server. Compare the IP address reported by DNS or Net. BIOS in the network trace for the server with the IP addresses you noted earlier.

If it does not match then check DNS and WINS and note if there is a difference. DNS Name Resolution. To identify DNS Name Resolution in a network trace use the following filter in Network Monitor or Wireshark: dns. DNS resolution will be occurring at the client so open the network trace taken from the RPC client machine. You will be looking for one packet. DNS server and then the response packet from the DNS server.

It will look similar to this: If the trace shows the correct IP address for the RPC server was returned by the DNS server proceed to TCP Session Establishment. For general DNS troubleshooting. EN- US; 3. 30. 51. Net. BIOS Name Resolution. Net. BIOS queries come in two forms, WINS or Net. BIOS Broadcasts. WINS will consist of a unicast query to a WINS server and a response from the WINS server.

Net. BIOS broadcasts are queries broadcast to all hosts on the local subnet so name resolution is limited to only hosts on the subnet. The host with the name listed in the Net. BIOS Broadcast will respond with its IP address. To identify Net. BIOS Name Resolution in a network trace, use the following filter in Network Monitor -  “nbtns”. For Wireshark, use the following filter - nbns”.

If the trace shows a successful resolution using WINS or Net. BIOS queries proceed to TCP Session. Establishment. For details on troubleshooting this Net.

BIOS Name Resolution further: http: //technet. TCP Session Establishment. TCP Sessions always begin with a TCP 3- way handshake.

The handshake should look similar to what is shown below. The RPC Client will send the first packet, known as the SYN packet. To diagnose this you will want to look at the network traces taken from the RPC Client and RPC Server. If a firewall or other network device is causing. TCP SYN packet by the RPC Client about 3 seconds after the first TCP SYN is sent.

This can be seen in a Netmon network trace using the display filter specification of “tcpsynretransmit==1”. In other. cases, firewalls will allow the 3- way handshake to succeed but may block the RPC packets due to the contents of the packet at a higher level. In these cases it is possible to see the retransmit of the RPC packet within half a second of the original packet.

To identify this condition in a Netmon network trace use the display filter specification of “tcpretransmit==1”. To see either of these retransmit conditions in a trace taken using Wireshark use the display filter specification of “tcp.

Updated: Windows 1. Update KB3. 07. 46.

Update: I was contacted by Gabe Aul, our Ring Master, directly and he has informed me that a fix is in the works for this and will be pushed out soon. In the meantime there is a work around for the crash when uninstalling programs: In the Programs and features> Uninstall or change a program Control Panel area choose the program and instead of double- clicking, which usually begins the uninstall process, just click it once and then hit the Uninstall button at the top of the list. Another option is to use the Settings> System> Apps & features to remove a program from the system. For the crash relating to disabling a network adapter do the same thing - select the adapter and the click the disable button at the top of the list. Original article continues.. Over the last week Microsoft has released multiple updates to Windows 1.

Build 1. 02. 40. Please let us know about them in the comments below.