Fix port mirror rejection in intproxy #13679

Job	Run time
towncrier_check	6s
check_if_release_branch	1s
changed_files	7s
build mirrord CLI	0s
check-rust-docs	2m 1s
integration_tests	2m 0s
macos_tests	2m 55s
test_agent	1m 33s
lint	39s
test_cli_image	1m 38s
lint_markdown	0s
test_agent_image	1m 35s
vscode_e2e_on_release_branch	1s
intellij_e2e_on_release_branch	1s
e2e	1s
ci	1s
	12m 39s

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