Community maintenance is complete. Thank you for your patience!

Network and Storage Protocols

Cannot connect to DNS server over NBSS socket for port 139


hi All,

i see the below error message on the filer.

[NAS02:nbt.nbss.socketError:error]: NBT: Cannot connect to server over NBSS socket for port 139. Error 0x41: No route to host.

i see the filer can ping both the DNS servers.

did any one had same type of issue wrt DNS server connection ?

thanks in advance



That error indicates a NetBIOS over TCP/IP connection problem. The filer is trying to connect via CIFS so the address should be running Windows/Samba or something similar.

Can you ping from the filer's console to Is it running Windows file sharing? Is there a firewall blocking ports 135-139 or 445 (all used for Windows file sharing in various ways)?

This error has nothing to do with DNS.


139 is a CIFS port, DNS operates off TCP/UDP 53. Is a windows server?


Any followup to this?

NetApp on Discord Image

We're on Discord, are you?

Live Chat, Watch Parties, and More!

Explore Banner

Meet Explore, NetApp’s digital sales platform

Engage digitally throughout the sales process, from product discovery to configuration, and handle all your post-purchase needs.

NetApp Insights to Action
I2A Banner