NFS mount fails on AIX 7.3.2 with MNT reply error:ERR_ACCESS

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Category:: fas-systems

Specialty:: nas

Last Updated:

Applies to

ONTAP 9.13.1
AIX 7.3.2
NFSv3
NFSv4

Issue

AIX 7.3.2 systems are unable to mount NFS volumes from NetApp storage
The issue does not occur on AIX 7.2

Example:

Mount errors:

Access denied

Giving up

The file access permissions do not allow the specified action

Packet trace analysis:

TCP 3-way handshake is incomplete. SYN and SYN-ACK are observed, but the final ACK from the client is not received by the storage system

Client-Side packet capture(ERR_ACCESS/AIX 7.3.2):

775 2025-08-07 17:05:37.818280324 0.000066405 xxx.xxx.xxx.91 784 xxx.xxx.xxx.183 635 TCP 78 784 → 635 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=8 TSval=1754565924 TSecr=0

776 2025-08-07 17:05:37.818445296 0.000164972 xxx.xxx.xxx.183 635 xxx.xxx.xxx.91 784 TCP 78 635 → 784 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=256 TSval=768701427 TSecr=1754565924

777 2025-08-07 17:05:37.818462228 0.000016932 xxx.xxx.xxx.91 784 xxx.xxx.xxx.183 635 TCP 66 784 → 635 [ACK] Seq=1 Ack=1 Win=262088 Len=0 TSval=1754565924 TSecr=768701427

778 2025-08-07 17:05:37.818492882 0.000030654 xxx.xxx.xxx.91 784 xxx.xxx.xxx.183 635 MOUNT 110 V3 NULL Call (Reply In 779)

779 2025-08-07 17:05:37.818675337 0.000182455 xxx.xxx.xxx.183 635 xxx.xxx.xxx.91 784 MOUNT 94 V3 NULL Reply (Call In 778)

780 2025-08-07 17:05:37.818731132 0.000055795 xxx.xxx.xxx.91 784 xxx.xxx.xxx.183 111 Portmap 98 V2 GETPORT Call (Reply In 781) NFS(100003) V:3 TCP

781 2025-08-07 17:05:37.818875535 0.000144403 xxx.xxx.xxx.183 111 xxx.xxx.xxx.91 784 Portmap 70 V2 GETPORT Reply (Call In 780) Port:2049

782 2025-08-07 17:05:37.819085503 0.000209968 xxx.xxx.xxx.91 785 xxx.xxx.xxx.183 2049 TCP 78 785 → 2049 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=8 TSval=1754565924 TSecr=0

783 2025-08-07 17:05:37.819230261 0.000144758 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.91 785 TCP 78 2049 → 785 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=256 TSval=4169494068 TSecr=1754565924

784 2025-08-07 17:05:37.819235421 0.000005160 xxx.xxx.xxx.91 785 xxx.xxx.xxx.183 2049 TCP 66 785 → 2049 [ACK] Seq=1 Ack=1 Win=262088 Len=0 TSval=1754565924 TSecr=4169494068

785 2025-08-07 17:05:37.819271908 0.000036487 xxx.xxx.xxx.91 785 xxx.xxx.xxx.183 2049 NFS 110 V3 NULL Call (Reply In 786)

786 2025-08-07 17:05:37.819467841 0.000195933 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.91 785 NFS 94 V3 NULL Reply (Call In 785)

787 2025-08-07 17:05:37.819501003 0.000033162 xxx.xxx.xxx.91 785 xxx.xxx.xxx.183 2049 TCP 66 785 → 2049 [FIN, ACK] Seq=45 Ack=29 Win=262088 Len=0 TSval=1754565924 TSecr=4169494068

788 2025-08-07 17:05:37.819539587 0.000038584 xxx.xxx.xxx.91 784 xxx.xxx.xxx.183 635 MOUNT 186 V3 MNT Call (Reply In 792) /vol7

789 2025-08-07 17:05:37.819640517 0.000100930 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.91 785 TCP 66 2049 → 785 [ACK] Seq=29 Ack=46 Win=65792 Len=0 TSval=4169494068 TSecr=1754565924

790 2025-08-07 17:05:37.819684300 0.000043783 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.91 785 TCP 66 2049 → 785 [FIN, ACK] Seq=29 Ack=46 Win=65792 Len=0 TSval=4169494068 TSecr=1754565924

791 2025-08-07 17:05:37.819688087 0.000003787 xxx.xxx.xxx.91 785 xxx.xxx.xxx.183 2049 TCP 66 785 → 2049 [ACK] Seq=46 Ack=30 Win=262088 Len=0 TSval=1754565924 TSecr=4169494068

792 2025-08-07 17:05:37.819705908 0.000017821 xxx.xxx.xxx.183 635 xxx.xxx.xxx.91 784 MOUNT 98 V3 MNT Reply (Call In 788) Error:ERR_ACCESS

Storage-Side packet capture(ERR_ACCESS/AIX 7.3.2):

3 2025-08-13 09:09:02.822486 0.000234 xxx.xxx.xxx.91 818 xxx.xxx.xxx.183 635 TCP 74 818 → 635 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=8 TSval=1755545519 TSecr=0

4 2025-08-13 09:09:02.822506 0.000020 xxx.xxx.xxx.183 635 xxx.xxx.xxx.91 818 TCP 74 635 → 818 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=256 TSval=3511853471 TSecr=1755545519

5 2025-08-13 09:09:02.822671 0.000165 xxx.xxx.xxx.91 818 xxx.xxx.xxx.183 635 MOUNT 110 V3 NULL Call (Reply In 6)

6 2025-08-13 09:09:02.822734 0.000063 xxx.xxx.xxx.183 635 xxx.xxx.xxx.91 818 MOUNT 94 V3 NULL Reply (Call In 5)

7 2025-08-13 09:09:02.822894 0.000160 xxx.xxx.xxx.91 818 xxx.xxx.xxx.183 111 Portmap 98 V2 GETPORT Call (Reply In 8) NFS(100003) V:3 TCP

8 2025-08-13 09:09:02.822916 0.000022 xxx.xxx.xxx.183 111 xxx.xxx.xxx.91 818 Portmap 70 V2 GETPORT Reply (Call In 7) Port:2049

9 2025-08-13 09:09:02.823267 0.000351 xxx.xxx.xxx.91 819 xxx.xxx.xxx.183 2049 TCP 74 819 → 2049 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=8 TSval=1755545519 TSecr=0

10 2025-08-13 09:09:02.823276 0.000009 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.91 819 TCP 74 2049 → 819 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=256 TSval=136116159 TSecr=1755545519

11 2025-08-13 09:09:02.823453 0.000177 xxx.xxx.xxx.91 819 xxx.xxx.xxx.183 2049 NFS 110 V3 NULL Call (Reply In 12)

12 2025-08-13 09:09:02.823499 0.000046 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.91 819 NFS 94 V3 NULL Reply (Call In 11)

13 2025-08-13 09:09:02.823667 0.000168 xxx.xxx.xxx.91 819 xxx.xxx.xxx.183 2049 TCP 66 819 → 2049 [FIN, ACK] Seq=45 Ack=29 Win=262088 Len=0 TSval=1755545519 TSecr=136116159

14 2025-08-13 09:09:02.823684 0.000017 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.91 819 TCP 66 2049 → 819 [ACK] Seq=29 Ack=46 Win=65792 Len=0 TSval=136116160 TSecr=1755545519

15 2025-08-13 09:09:02.823706 0.000022 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.91 819 TCP 66 2049 → 819 [FIN, ACK] Seq=29 Ack=46 Win=65792 Len=0 TSval=136116160 TSecr=1755545519

16 2025-08-13 09:09:02.823714 0.000008 xxx.xxx.xxx.91 818 xxx.xxx.xxx.183 635 MOUNT 186 V3 MNT Call (Reply In 17) /vol7

17 2025-08-13 09:09:02.823740 0.000026 xxx.xxx.xxx.183 635 xxx.xxx.xxx.91 818 MOUNT 98 V3 MNT Reply (Call In 16) Error:ERR_ACCESS

Storage-Side Packet Capture(Normal/AIX 7.2):

5243 2025-08-13 09:15:12.746409 0.000297 xxx.xxx.xxx.21 702 xxx.xxx.xxx.183 635 TCP 74 702 → 635 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=8 TSval=1812297972 TSecr=0

5244 2025-08-13 09:15:12.746444 0.000035 xxx.xxx.xxx.183 635 xxx.xxx.xxx.21 702 TCP 74 635 → 702 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=256 TSval=1476870346 TSecr=1812297972

5245 2025-08-13 09:15:12.746695 0.000251 xxx.xxx.xxx.21 702 xxx.xxx.xxx.183 635 TCP 66 702 → 635 [ACK] Seq=1 Ack=1 Win=262088 Len=0 TSval=1812297972 TSecr=1476870346

5246 2025-08-13 09:15:12.746718 0.000023 xxx.xxx.xxx.21 702 xxx.xxx.xxx.183 635 MOUNT 110 V3 NULL Call (Reply In 5247)

5247 2025-08-13 09:15:12.746769 0.000051 xxx.xxx.xxx.183 635 xxx.xxx.xxx.21 702 MOUNT 94 V3 NULL Reply (Call In 5246)

5248 2025-08-13 09:15:12.746934 0.000165 xxx.xxx.xxx.21 702 xxx.xxx.xxx.183 111 Portmap 98 V2 GETPORT Call (Reply In 5249) NFS(100003) V:3 TCP

5249 2025-08-13 09:15:12.746994 0.000060 xxx.xxx.xxx.183 111 xxx.xxx.xxx.21 702 Portmap 70 V2 GETPORT Reply (Call In 5248) Port:2049

5250 2025-08-13 09:15:12.749617 0.002623 xxx.xxx.xxx.21 703 xxx.xxx.xxx.183 2049 TCP 74 703 → 2049 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=8 TSval=1812297972 TSecr=0

5251 2025-08-13 09:15:12.749632 0.000015 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.21 703 TCP 74 2049 → 703 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=256 TSval=2421660137 TSecr=1812297972

5252 2025-08-13 09:15:12.749993 0.000361 xxx.xxx.xxx.21 703 xxx.xxx.xxx.183 2049 TCP 66 703 → 2049 [ACK] Seq=1 Ack=1 Win=262088 Len=0 TSval=1812297972 TSecr=2421660137

5253 2025-08-13 09:15:12.750039 0.000046 xxx.xxx.xxx.21 703 xxx.xxx.xxx.183 2049 NFS 110 V3 NULL Call (Reply In 5254)

5254 2025-08-13 09:15:12.750059 0.000020 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.21 703 NFS 94 V3 NULL Reply (Call In 5253)

5255 2025-08-13 09:15:12.750345 0.000286 xxx.xxx.xxx.21 703 xxx.xxx.xxx.183 2049 TCP 66 703 → 2049 [FIN, ACK] Seq=45 Ack=29 Win=262088 Len=0 TSval=1812297972 TSecr=2421660138

5256 2025-08-13 09:15:12.750356 0.000011 xxx.xxx.xxx.21 702 xxx.xxx.xxx.183 635 MOUNT 182 V3 MNT Call (Reply In 5259) /vol7

5257 2025-08-13 09:15:12.750359 0.000003 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.21 703 TCP 66 2049 → 703 [ACK] Seq=29 Ack=46 Win=65792 Len=0 TSval=2421660138 TSecr=1812297972

5258 2025-08-13 09:15:12.750381 0.000022 xxx.xxx.xxx.183 2049 xxx.xxx.xxx.21 703 TCP 66 2049 → 703 [FIN, ACK] Seq=29 Ack=46 Win=65792 Len=0 TSval=2421660138 TSecr=1812297972

5259 2025-08-13 09:15:12.750451 0.000070 xxx.xxx.xxx.183 635 xxx.xxx.xxx.21 702 MOUNT 170 V3 MNT Reply (Call In 5256)