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ISCSI: iswtu_evr: unexpected event id 185 reported

Hi guys.

I try present LUN to Windows 2012 via iSCSI and recieve error:

ISCSI: iswtu_evr: unexpected event id 185 reported

Logs of FAS2040 confirm it:

[fas2040a:iscsi.warning:warning]: ISCSI: iswtu_evr: unexpected event id 185 reported

Mon Apr 28 04:52:39 GMT [fas2040a:iscsi.notice:notice]: ISCSI: New session from initiator iqn.1991-05.com.microsoft:srv-mxntap01.*.tst at IP addr 10.*.*.119

Mon Apr 28 04:53:37 GMT [fas2040a:iscsi.notice:notice]: ISCSI: Initiator (iqn.1991-05.com.microsoft:srv-mxntap01.ntap.tst) sent LUN Reset request, aborting all

Can somebody help me with troubleshooting this problem?

Re: ISCSI: iswtu_evr: unexpected event id 185 reported

I found solution by myself. What I did:

1. Install wireshark on server and checktraffic between server and fas2040.

2. Found a problem with segmentation TCP/IP packet.

3. Check MTU size.

    fas2040 - 9000

    server (both NICs) - 9000

4. I didn`t have access to managment of switch and didn`t have opportunity check MTU size on switch.

5. Reconfigure MTU on both sides to 1500 (I know that need 9000, both this just demo)

After it everything work correct.