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+Title: Dillo fails to connect to PHP internal http webserver / PHP webserver instantly resets TCP connection
+Author: ghost
+Created: Sat, 15 Feb 2025 14:11:55 +0000
+State: closed
+
+**1. Start PHP internal webserver by running:** 
+
+`php -S localhost:80 -t /path/to/html-directory/`
+
+(you can choos to use an port above 1024 if you do not have enough privileges)
+
+**2. Try to connect to the URL (http://localhost:80, for example)**
+
+ - Dillo displays error message: "Could not establish connection"
+
+
+**4. Looking at Wireshark log the following TCP package sequence can be seen**
+
+Dillo Requests connection
+PHP resets connection
+Dillo Requests connection
+PHP resets conntection 
+
+
+**Packet capture details of the first 2 packets**
+
+Dillo request: 
+
+```
+Transmission Control Protocol, Src Port: 43556, Dst Port: 80, Seq: 0, Len: 0
+    Source Port: 43556
+    Destination Port: 80
+    [Stream index: 0]
+    [Conversation completeness: Incomplete (37)]
+    [TCP Segment Len: 0]
+    Sequence Number: 0    (relative sequence number)
+    Sequence Number (raw): 211095531
+    [Next Sequence Number: 1    (relative sequence number)]
+    Acknowledgment Number: 0
+    Acknowledgment number (raw): 0
+    1010 .... = Header Length: 40 bytes (10)
+    Flags: 0x002 (SYN)
+        000. .... .... = Reserved: Not set
+        ...0 .... .... = Accurate ECN: Not set
+        .... 0... .... = Congestion Window Reduced: Not set
+        .... .0.. .... = ECN-Echo: Not set
+        .... ..0. .... = Urgent: Not set
+        .... ...0 .... = Acknowledgment: Not set
+        .... .... 0... = Push: Not set
+        .... .... .0.. = Reset: Not set
+        .... .... ..1. = Syn: Set
+            [Expert Info (Chat/Sequence): Connection establish request (SYN): server port 80]
+                [Connection establish request (SYN): server port 80]
+                [Severity level: Chat]
+                [Group: Sequence]
+        .... .... ...0 = Fin: Not set
+        [TCP Flags: ··········S·]
+    Window: 65495
+    [Calculated window size: 65495]
+    Checksum: 0xf5ad [unverified]
+    [Checksum Status: Unverified]
+    Urgent Pointer: 0
+    Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps, No-Operation (NOP), Window scale
+        TCP Option - Maximum segment size: 65495 bytes
+            Kind: Maximum Segment Size (2)
+            Length: 4
+            MSS Value: 65495
+        TCP Option - SACK permitted
+            Kind: SACK Permitted (4)
+            Length: 2
+        TCP Option - Timestamps: TSval 423197222, TSecr 0
+            Kind: Time Stamp Option (8)
+            Length: 10
+            Timestamp value: 423197222
+            Timestamp echo reply: 0
+        TCP Option - No-Operation (NOP)
+            Kind: No-Operation (1)
+        TCP Option - Window scale: 7 (multiply by 128)
+            Kind: Window Scale (3)
+            Length: 3
+            Shift count: 7
+            [Multiplier: 128]
+    [Timestamps]
+        [Time since first frame in this TCP stream: 0.000000000 seconds]
+        [Time since previous frame in this TCP stream: 0.000000000 seconds]
+```
+
+
+PHP response: 
+```
+
+Transmission Control Protocol, Src Port: 80, Dst Port: 43556, Seq: 1, Ack: 1, Len: 0
+    Source Port: 80
+    Destination Port: 43556
+    [Stream index: 0]
+    [Conversation completeness: Incomplete (37)]
+    [TCP Segment Len: 0]
+    Sequence Number: 1    (relative sequence number)
+    Sequence Number (raw): 0
+    [Next Sequence Number: 1    (relative sequence number)]
+    Acknowledgment Number: 1    (relative ack number)
+    Acknowledgment number (raw): 211095532
+    0101 .... = Header Length: 20 bytes (5)
+    Flags: 0x014 (RST, ACK)
+        000. .... .... = Reserved: Not set
+        ...0 .... .... = Accurate ECN: Not set
+        .... 0... .... = Congestion Window Reduced: Not set
+        .... .0.. .... = ECN-Echo: Not set
+        .... ..0. .... = Urgent: Not set
+        .... ...1 .... = Acknowledgment: Set
+        .... .... 0... = Push: Not set
+        .... .... .1.. = Reset: Set
+            [Expert Info (Warning/Sequence): Connection reset (RST)]
+                [Connection reset (RST)]
+                [Severity level: Warning]
+                [Group: Sequence]
+        .... .... ..0. = Syn: Not set
+        .... .... ...0 = Fin: Not set
+        [TCP Flags: ·······A·R··]
+    Window: 0
+    [Calculated window size: 0]
+    [Window size scaling factor: -1 (unknown)]
+    Checksum: 0xead8 [unverified]
+    [Checksum Status: Unverified]
+    Urgent Pointer: 0
+    [Timestamps]
+        [Time since first frame in this TCP stream: 0.000044930 seconds]
+        [Time since previous frame in this TCP stream: 0.000044930 seconds]
+    [SEQ/ACK analysis]
+        [This is an ACK to the segment in frame: 438]
+        [The RTT to ACK the segment was: 0.000044930 seconds]
+        [iRTT: 0.000044930 seconds]
+```
+
+
+
+
+--%--
+From: rodarima
+Date: Sat, 15 Feb 2025 14:37:45 +0000
+
+What does “curl -v http://localhost” says?
+
+
+--%--
+From: ghost
+Date: Sat, 15 Feb 2025 15:00:09 +0000
+
+Interesting, seems to be IP version related, haven't thought about that. 
+
+curl -v http://localhost:12888/index.html
+*   Trying 127.0.0.1:12888...
+* connect to 127.0.0.1 port 12888 failed: Connection rejected
+*   Trying [::1]:12888...
+* Connected to localhost (::1) port 12888 (#0)
+> GET /index.html HTTP/1.1
+> Host: localhost:12888
+> User-Agent: curl/7.88.1
+> Accept: */*
+> 
+< HTTP/1.1 200 OK
+< Host: localhost:12888
+< Date: Sat, 15 Feb 2025 14:57:44 GMT
+< Connection: close
+< Content-Type: text/html; charset=UTF-8
+< Content-Length: 49935
+
+
+
+--%--
+From: rodarima
+Date: Sat, 15 Feb 2025 15:08:38 +0000
+
+Try building dillo with --enable-ipv6, it looks you are listening on IPv6 only.
+
+--%--
+From: ghost
+Date: Sat, 15 Feb 2025 15:15:48 +0000
+
+Yeah, that was an example of RTFM and works fine now  🙈👍 
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