Wireshark: Trying to find the cause of the error

Posted on 2013-09-18
Medium Priority
Last Modified: 2013-09-24
"The specified network name is no longer available"

We have an application that gives this error message to the users when trying to communicate to our SQL server.

I ran a wireshark capture, and found a lot of errors, especially ones with BAD Header checksum.

Can anyone spot anything wrong in this packet capture?

3251      14:40:55.117761000      TCP      1434      [TCP segment of a reassembled PDU]

3252      14:40:55.117784000      TCP      54      63934 > ms-sql-s [ACK] Seq=832 Ack=576761 Win=131072 Len=0

3253      14:40:55.117823000      TCP      1434      [TCP segment of a reassembled PDU]

Our SQL IP Addr is:, and when I filter on ip.dst == For the most part I see things like:

3812      14:40:55.163537000      TCP      204      [TCP segment of a reassembled PDU]

Internet Protocol Version 4, Src: (, Dst: (

Header checksum: 0x0000 [incorrect, should be 0xf7f2 (may be caused by "IP checksum offload"?)]

Bad: True

Expert Info (Error/Checksum): Bad checksum
Question by:pzozulka
1 Comment

Accepted Solution

dipopo earned 2000 total points
ID: 39503381
Could you disable checksum offloading on wireshark then try again.

Edit > Preferences > + Protocols .... disable Validate the x Checksum if possible in UDP, TCP and IP

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