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This is a 4.0 bug caused by a config (UAT) file format change:
18214: Allow configuring a port for custom dns servers for dns name resolution

Short term you could look in the profile directory for the file addr_resolve_dns_servers and rename it so that it is not loaded.

The new format of the file is:

# This file is automatically generated, DO NOT MODIFY.
"192.168.200.1","0","53"

Which is "IP address", "TCP Port", "UDP Port" if you want to update the file manually.

It would help if you open an issue on https://gitlab.com/wireshark/wireshark/-/issues/ .

This is a 4.0 bug caused by be a config (UAT) file format change:
18214: Allow configuring a port for custom dns servers for dns name resolution

Short term you could look in the profile directory for the file addr_resolve_dns_servers and rename it so that it is not loaded.

The new format of the file is:

# This file is automatically generated, DO NOT MODIFY.
"192.168.200.1","0","53"

Which is "IP address", "TCP Port", "UDP Port" if you want to update the file manually.

It would help if you open an issue on https://gitlab.com/wireshark/wireshark/-/issues/ .