Samba client unable to mount CIFS to NTFS share due to DNS: Input/output error
Applies to
- ONTAP 9
- SAMBA client
- CIFS
- LDAPS
Issue
- Samba client unable to mount an NTFS CIFS share and gets an
Input/output error:
# mount -t cifs //<SVM>/<volume>/<directy/tmp/FileTest/ -o credentials=/etc/cifs.creds_MDS,vers=1.0,file_mode=0755,dir_mode=0755,iocharset=utf8,mapchars
mount error(5): Input/output error
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)
- Packet trace shows NTLM authentication is failing with error
STATUS_NO_LOGON_SERVERS (0xc000005e):
- SECD logs show that ONTAP fails to connect to AD-LDAP:
Sat Jun 14 2025 19:40:37 +01:00 [kern_secd:info:12559] | [000.464.329] info : Source: DNS unavailable. Entry for host-address:10.xx.xx.xx not found in any of the available sources { in SecdCbNsJournal() at src/utils/secd_ns_utils.cpp:94 }
Sat Jun 14 2025 19:40:37 +01:00 [kern_secd:info:12559] | [000.464.712] debug: Found matching cache 'cc:C:3:0' { in secd_ccache_resolve() at src/utils/secd_krb_ccache.cpp:1052 }
Sat Jun 14 2025 19:40:37 +01:00 [kern_secd:info:12559] | [000.464.748] info : [krb5 context 09629000] Getting credentials xx$@xx.xx -> ldap/10.xx.xx.xx@ using ccache NETAPPCC:cc:C:3:0
Sat Jun 14 2025 19:40:37 +01:00 [kern_secd:info:12559] | [000.556.681] info : [krb5 context 09629000] TGS request result: -1765328377/Server not found in Kerberos database