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Wireshark GUI freezes for a minute on capture start

asked 2022-01-23 20:26:17 +0000

rossboulet gravatar image

Running Windows 10, 21H2, Wireshark 3.6.1, Npcap 1.60, NO USBpcap.

When I start a capture, everything looks good for a few seconds. I see packets being displayed. After a few seconds, the display freezes. Then, approximately 60 seconds after I started the capture, the display frees up and seems to catch up. Anyone else seeing this behavior?

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Some type of name resolution timeout perhaps?

Bob Jones gravatar imageBob Jones ( 2022-01-24 10:47:48 +0000 )edit

I noticed a similar behaviour running under windows 7 and NCAP 1.6. I tried reinstalling a few times and winding back to previous restore points to no avail. Reverting to Wireshare 3.4.11 was the only option for me.

alex314 gravatar imagealex314 ( 2022-01-26 01:36:08 +0000 )edit

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answered 2022-01-27 23:08:13 +0000

rossboulet gravatar image

Thanks for the suggestions. It was not a DNS issue, but it got me started digging into the settings. I turned off all the MAC and name resolution options and was still having the issue. Finally, I created a new profile and the issue went away. By exporting my old and new profiles and comparing them, I found the problem. A while back I was experimenting with decrypting some HTTPS traffic and has set the Windows environment variable for SSLKEYLOGFILE and added a Wireshark option to the TLS protocol for (Pre)-Master-Secret log file. My SSL log file had grown to over 800MB. So when I would start a capture, as soon as it caught a TLS packet, the GUI would freeze while the log file was accessed. I was wondering why there was a variable length of time before it froze, but after this discovery, I found it was always freezing on the first TLS packet.

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Chuckc gravatar imageChuckc ( 2022-01-28 03:29:32 +0000 )edit
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answered 2022-01-25 20:15:09 +0000

mrEEde gravatar image

This could possibly be a DNS resolution attempt slowing down the the machine.
Please retry by unchecking the 'Use an external network name resolver' under the Name resolution preferences . Regards Matthias

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Asked: 2022-01-23 20:26:17 +0000

Seen: 779 times

Last updated: Jan 27