Learn how to fix the nfs clnt_create rpc authentication error. Our NFS Support team is here to help you with your questions and concerns.

NFS clnt_create rpc Authentication Error | Fix it!

Setting up an NFS server for a SAP instance can greatly enhance data sharing and accessibility. However, errors like the one below can make it challenging.

clnt_create: RPC: Port mapper failure

Today, our experts are going to take us through a detailed checklist to help us identify and fix this problem. This includes ensuring a seamless NFS connection.

Before we begin, let’s take a look at how the error occurs.

Some of our customers got this error while trying to check the NFS share using the `showmount` command on the database host.

# showmount -e 192.168.101.4
clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)


Here, 192.168.101.4 is the NFS server’s IP address. Let’s dive into the checklist to troubleshoot and address the issue.

Troubleshooting Checklist

1. First, we have to check if there is proper connectivity between the NFS client machine and the server with these commands:

   ping 192.168.101.4

   In case ICMP is disabled, we have to use alternative checks as well:

   ssh 192.168.101.4
2. Next, we have to use `rpcinfo` on the NFS client machine to display RPC information for the remote NFS server:

   rpcinfo -p 192.168.101.4

   We have to verify if the output shows that RPC can communicate with the NFS server and confirms that NFS services are running.
3. Then, it is time to verify if IPTables is running on the NFS server:

   service iptables status

   If running, open up ports 111 and 2049:

   iptables -A INPUT -p tcp --dport 111 -j ACCEPT
iptables -A INPUT -p udp --dport 111 -j ACCEPT
iptables -A INPUT -p tcp --dport 2049 -j ACCEPT
iptables -A INPUT -p udp --dport 2049 -j ACCEPT


   Although SELinux, usually allows NFS, it is a good idea to check the audit.log file for any SELinux-related issues.
4. Next, we have to check files like `/etc/hosts.allow` or `/etc/hosts.deny` for any entries blocking NFS services:

   cat /etc/hosts.deny

   We have to remove any entries like:

   rpcbind: ALL
nfs-server: ALL


By going through this checklist, we can pinpoint the root cause of the “clnt_create: RPC: Port mapper failure” error and take corrective actions. Troubleshooting NFS connection issues ensures a stable and efficient data-sharing environment for the SAP instance.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

In brief, our Support Experts demonstrated how to fix the NFS clnt_create rpc authentication error.