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diff --git a/contrib/unbound/testdata/iter_fwdfirstequaltcp.rpl b/contrib/unbound/testdata/iter_fwdfirstequaltcp.rpl
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+; config options
+server:
+ target-fetch-policy: "0 0 0 0 0"
+ minimal-responses: no
+ tcp-upstream: no
+ #tls-upstream:no # same case but not testable in rpl.
+
+# Builtin hints work similar to this explicit '.' stub-zone.
+stub-zone:
+ name: "."
+ stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
+
+forward-zone:
+ name: "."
+ forward-addr: 1.2.3.6 # failing resolver
+ forward-first: yes
+ forward-tcp-upstream: yes
+ #forward-tls-upstream:yes # same case but not testable in rpl.
+
+CONFIG_END
+
+SCENARIO_BEGIN Test forward-first directive in forward zone configured with explicit tcp upstream next to an equal stub name.
+
+; K.ROOT-SERVERS.NET.
+RANGE_BEGIN 0 100
+ ADDRESS 193.0.14.129
+ENTRY_BEGIN
+MATCH UDP opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+. IN NS
+SECTION ANSWER
+. IN NS K.ROOT-SERVERS.NET.
+SECTION ADDITIONAL
+K.ROOT-SERVERS.NET. IN A 193.0.14.129
+ENTRY_END
+
+ENTRY_BEGIN
+MATCH UDP opcode subdomain
+ADJUST copy_id copy_query
+REPLY QR NOERROR
+SECTION QUESTION
+com. IN A
+SECTION AUTHORITY
+com. IN NS a.gtld-servers.net.
+SECTION ADDITIONAL
+a.gtld-servers.net. IN A 192.5.6.30
+ENTRY_END
+RANGE_END
+
+; a.gtld-servers.net.
+RANGE_BEGIN 0 100
+ ADDRESS 192.5.6.30
+ENTRY_BEGIN
+MATCH UDP opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+com. IN NS
+SECTION ANSWER
+com. IN NS a.gtld-servers.net.
+SECTION ADDITIONAL
+a.gtld-servers.net. IN A 192.5.6.30
+ENTRY_END
+
+ENTRY_BEGIN
+MATCH UDP opcode subdomain
+ADJUST copy_id copy_query
+REPLY QR NOERROR
+SECTION QUESTION
+example.com. IN A
+SECTION AUTHORITY
+example.com. IN NS ns.example.com.
+SECTION ADDITIONAL
+ns.example.com. IN A 1.2.3.4
+ENTRY_END
+RANGE_END
+
+; ns.example.com.
+RANGE_BEGIN 0 100
+ ADDRESS 1.2.3.4
+ENTRY_BEGIN
+MATCH UDP opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+example.com. IN NS
+SECTION ANSWER
+example.com. IN NS ns.example.com.
+SECTION ADDITIONAL
+ns.example.com. IN A 1.2.3.4
+ENTRY_END
+
+ENTRY_BEGIN
+MATCH UDP opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+www.example.com. IN A
+SECTION ANSWER
+www.example.com. IN A 10.20.30.40
+SECTION AUTHORITY
+example.com. IN NS ns.example.com.
+SECTION ADDITIONAL
+ns.example.com. IN A 1.2.3.4
+ENTRY_END
+RANGE_END
+
+; local resolver (that fails a lot)
+RANGE_BEGIN 0 100
+ ADDRESS 1.2.3.6
+
+ENTRY_BEGIN
+MATCH TCP opcode qtype qname
+ADJUST copy_id
+REPLY QR RA SERVFAIL
+SECTION QUESTION
+example.com. IN NS
+SECTION ANSWER
+;example.com. IN NS ns.example.com.
+SECTION ADDITIONAL
+;ns.example.com. IN A 1.2.3.4
+ENTRY_END
+
+ENTRY_BEGIN
+MATCH TCP opcode qtype qname
+ADJUST copy_id
+REPLY QR RA SERVFAIL
+SECTION QUESTION
+www.example.com. IN A
+SECTION ANSWER
+;www.example.com. IN A 10.20.30.50
+SECTION AUTHORITY
+;example.com. IN NS ns.example.com.
+SECTION ADDITIONAL
+;ns.example.com. IN A 1.2.3.4
+ENTRY_END
+RANGE_END
+
+STEP 1 QUERY
+ENTRY_BEGIN
+REPLY RD
+SECTION QUESTION
+www.example.com. IN A
+ENTRY_END
+
+; recursion happens here.
+STEP 10 CHECK_ANSWER
+ENTRY_BEGIN
+MATCH all
+REPLY QR RD RA NOERROR
+SECTION QUESTION
+www.example.com. IN A
+SECTION ANSWER
+www.example.com. IN A 10.20.30.40
+SECTION AUTHORITY
+example.com. IN NS ns.example.com.
+SECTION ADDITIONAL
+ns.example.com. IN A 1.2.3.4
+ENTRY_END
+
+SCENARIO_END