title: What network error could be responsible for Status (failed) and type Pending in Chrome?
body: <p>From time to time a site I'm maintaining get failed GET requests on some resources. The status is returned as (failed) and the type as Pending. The headers containg nothing more than the request itself, no response whatsoever.</p>
  
  <p>The server is running Drupal and Varnish.</p>
  
  <p>Any thoughts on what causes the failure or where to start debugging?</p>
  
  <p><img src="https://i.stack.imgur.com/7KUkB.png" alt="Failed GET request in Chrome dev tools"></p>
  
  <p>This might be related to <a href="https://stackoverflow.com/questions/10125784/what-kind-of-network-error-is-chrome-encountering-when-status-failed-and">What kind of network error is Chrome encountering when 'Status = (failed)' and 'Type = undefined'</a> even though the type return a different message. Could someone maybe confirm this? If so, how could I debug this?</p>
  
  <p>Thanks in advance</p>
  
  <p><strong>EDIT, I just installed wireshark to try to debug a bit more.</strong></p>
  
  <p>Here's the entire followup on the failed request</p>
  
  <p><img src="https://i.stack.imgur.com/5uSgi.png" alt="Wireshark screenshot"></p>
  
  <p><strong>A dump of 94645, 94651, 94686 and 94688</strong></p>
  
  <pre><code>No.     Time        Source                Destination           Protocol Length Info
    94645 211.219995  192.168.0.101         85.134.37.196         HTTP     1192   [TCP Retransmission] GET /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css HTTP/1.1 
  
  Frame 94645: 1192 bytes on wire (9536 bits), 1192 bytes captured (9536 bits)
      Arrival Time: Nov  7, 2012 22:55:18.002267000 EET
      Epoch Time: 1352321718.002267000 seconds
      [Time delta from previous captured frame: 0.006199000 seconds]
      [Time delta from previous displayed frame: 0.815800000 seconds]
      [Time since reference or first frame: 211.219995000 seconds]
      Frame Number: 94645
      Frame Length: 1192 bytes (9536 bits)
      Capture Length: 1192 bytes (9536 bits)
      [Frame is marked: True]
      [Frame is ignored: False]
      [Protocols in frame: eth:ip:tcp:http]
      [Coloring Rule Name: Bad TCP]
      [Coloring Rule String: tcp.analysis.flags]
  Ethernet II, Src: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f), Dst: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
      Destination: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
          Address: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
          .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
          .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
      Source: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
          Address: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
          .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
          .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
      Type: IP (0x0800)
  Internet Protocol Version 4, Src: 192.168.0.101 (192.168.0.101), Dst: 85.134.37.196 (85.134.37.196)
      Version: 4
      Header length: 20 bytes
      Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
          0000 00.. = Differentiated Services Codepoint: Default (0x00)
          .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
      Total Length: 1178
      Identification: 0x4e23 (20003)
      Flags: 0x02 (Don't Fragment)
          0... .... = Reserved bit: Not set
          .1.. .... = Don't fragment: Set
          ..0. .... = More fragments: Not set
      Fragment offset: 0
      Time to live: 64
      Protocol: TCP (6)
      Header checksum: 0xabe3 [correct]
          [Good: True]
          [Bad: False]
      Source: 192.168.0.101 (192.168.0.101)
      Destination: 85.134.37.196 (85.134.37.196)
  Transmission Control Protocol, Src Port: 51714 (51714), Dst Port: http (80), Seq: 1, Ack: 1, Len: 1126
      Source port: 51714 (51714)
      Destination port: http (80)
      [Stream index: 5205]
      Sequence number: 1    (relative sequence number)
      [Next sequence number: 1127    (relative sequence number)]
      Acknowledgement number: 1    (relative ack number)
      Header length: 32 bytes
      Flags: 0x018 (PSH, ACK)
          000. .... .... = Reserved: Not set
          ...0 .... .... = Nonce: Not set
          .... 0... .... = Congestion Window Reduced (CWR): Not set
          .... .0.. .... = ECN-Echo: Not set
          .... ..0. .... = Urgent: Not set
          .... ...1 .... = Acknowledgement: Set
          .... .... 1... = Push: Set
          .... .... .0.. = Reset: Not set
          .... .... ..0. = Syn: Not set
          .... .... ...0 = Fin: Not set
      Window size value: 229
      [Calculated window size: 14656]
      [Window size scaling factor: 64]
      Checksum: 0xb15e [validation disabled]
          [Good Checksum: False]
          [Bad Checksum: False]
      Options: (12 bytes)
          No-Operation (NOP)
          No-Operation (NOP)
          Timestamps: TSval 30409363, TSecr 1723048723
              Kind: Timestamp (8)
              Length: 10
              Timestamp value: 30409363
              Timestamp echo reply: 1723048723
      [SEQ/ACK analysis]
          [Bytes in flight: 1126]
          [TCP Analysis Flags]
              [This frame is a (suspected) retransmission]
                  [Expert Info (Note/Sequence): Retransmission (suspected)]
                      [Message: Retransmission (suspected)]
                      [Severity level: Note]
                      [Group: Sequence]
              [The RTO for this segment was: 1.480371000 seconds]
              [RTO based on delta from frame: 92823]
  Hypertext Transfer Protocol
      GET /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css HTTP/1.1\r\n
          [Expert Info (Chat/Sequence): GET /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css HTTP/1.1\r\n]
              [Message: GET /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css HTTP/1.1\r\n]
              [Severity level: Chat]
              [Group: Sequence]
          Request Method: GET
          Request URI: /sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css
          Request Version: HTTP/1.1
      Host: www.snellman.fi\r\n
      Connection: keep-alive\r\n
      User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4\r\n
      Accept: text/css,*/*;q=0.1\r\n
      Referer: http://www.snellman.fi/sv\r\n
      Accept-Encoding: gzip,deflate,sdch\r\n
      Accept-Language: en-US,en;q=0.8\r\n
      Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n
      [truncated] Cookie: v_tid=82524dc4552b4cd4a22d1fa4e7e78d72; Drupal.toolbar.collapsed=0; ctools-collapsible-state=views-ui-advanced-column-uusimmat_reseptit%3A1%2Cviews-ui-advanced-column-Related%3A1; Drupal.tableDrag.showWeight=0; SESS4049
      \r\n
      [Full request URI: http://www.snellman.fi/sites/default/files/css/css_4PXz_aZSHtm7FWHqYsMdm7sl9C4802BFn9tXlePfpJU.css]
  
  ---------------------------------------------------------------------------------------------------------------------------------------------------------
  
  No.     Time        Source                Destination           Protocol Length Info
    94651 211.228592  85.134.37.196         192.168.0.101         TCP      66     [TCP Dup ACK 92860#3] http &gt; 51714 [ACK] Seq=1 Ack=1 Win=14592 Len=0 TSval=1723049571 TSecr=1723044620
  
  Frame 94651: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
      Arrival Time: Nov  7, 2012 22:55:18.010864000 EET
      Epoch Time: 1352321718.010864000 seconds
      [Time delta from previous captured frame: 0.001166000 seconds]
      [Time delta from previous displayed frame: 0.008597000 seconds]
      [Time since reference or first frame: 211.228592000 seconds]
      Frame Number: 94651
      Frame Length: 66 bytes (528 bits)
      Capture Length: 66 bytes (528 bits)
      [Frame is marked: True]
      [Frame is ignored: False]
      [Protocols in frame: eth:ip:tcp]
      [Coloring Rule Name: Bad TCP]
      [Coloring Rule String: tcp.analysis.flags]
  Ethernet II, Src: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4), Dst: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
      Destination: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
          Address: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
          .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
          .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
      Source: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
          Address: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
          .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
          .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
      Type: IP (0x0800)
  Internet Protocol Version 4, Src: 85.134.37.196 (85.134.37.196), Dst: 192.168.0.101 (192.168.0.101)
      Version: 4
      Header length: 20 bytes
      Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
          0000 00.. = Differentiated Services Codepoint: Default (0x00)
          .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
      Total Length: 52
      Identification: 0x8b62 (35682)
      Flags: 0x02 (Don't Fragment)
          0... .... = Reserved bit: Not set
          .1.. .... = Don't fragment: Set
          ..0. .... = More fragments: Not set
      Fragment offset: 0
      Time to live: 58
      Protocol: TCP (6)
      Header checksum: 0x790a [correct]
          [Good: True]
          [Bad: False]
      Source: 85.134.37.196 (85.134.37.196)
      Destination: 192.168.0.101 (192.168.0.101)
  Transmission Control Protocol, Src Port: http (80), Dst Port: 51714 (51714), Seq: 1, Ack: 1, Len: 0
      Source port: http (80)
      Destination port: 51714 (51714)
      [Stream index: 5205]
      Sequence number: 1    (relative sequence number)
      Acknowledgement number: 1    (relative ack number)
      Header length: 32 bytes
      Flags: 0x010 (ACK)
          000. .... .... = Reserved: Not set
          ...0 .... .... = Nonce: Not set
          .... 0... .... = Congestion Window Reduced (CWR): Not set
          .... .0.. .... = ECN-Echo: Not set
          .... ..0. .... = Urgent: Not set
          .... ...1 .... = Acknowledgement: Set
          .... .... 0... = Push: Not set
          .... .... .0.. = Reset: Not set
          .... .... ..0. = Syn: Not set
          .... .... ...0 = Fin: Not set
      Window size value: 114
      [Calculated window size: 14592]
      [Window size scaling factor: 128]
      Checksum: 0xd246 [validation disabled]
          [Good Checksum: False]
          [Bad Checksum: False]
      Options: (12 bytes)
          No-Operation (NOP)
          No-Operation (NOP)
          Timestamps: TSval 1723049571, TSecr 1723044620
              Kind: Timestamp (8)
              Length: 10
              Timestamp value: 1723049571
              Timestamp echo reply: 1723044620
      [SEQ/ACK analysis]
          [TCP Analysis Flags]
              [This is a TCP duplicate ack]
          [Duplicate ACK #: 3]
          [Duplicate to the ACK in frame: 92860]
              [Expert Info (Note/Sequence): Duplicate ACK (#3)]
                  [Message: Duplicate ACK (#3)]
                  [Severity level: Note]
                  [Group: Sequence]
  
  ---------------------------------------------------------------------------------------------------------------------------------------------------------
  
  No.     Time        Source                Destination           Protocol Length Info
    94686 211.305208  85.134.37.196         192.168.0.101         TCP      66     http &gt; 51714 [FIN, ACK] Seq=1 Ack=1 Win=14592 Len=0 TSval=1723049647 TSecr=1723044620
  
  Frame 94686: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
      Arrival Time: Nov  7, 2012 22:55:18.087480000 EET
      Epoch Time: 1352321718.087480000 seconds
      [Time delta from previous captured frame: 0.000026000 seconds]
      [Time delta from previous displayed frame: 0.076616000 seconds]
      [Time since reference or first frame: 211.305208000 seconds]
      Frame Number: 94686
      Frame Length: 66 bytes (528 bits)
      Capture Length: 66 bytes (528 bits)
      [Frame is marked: True]
      [Frame is ignored: False]
      [Protocols in frame: eth:ip:tcp]
      [Coloring Rule Name: HTTP]
      [Coloring Rule String: http || tcp.port == 80]
  Ethernet II, Src: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4), Dst: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
      Destination: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
          Address: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
          .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
          .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
      Source: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
          Address: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
          .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
          .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
      Type: IP (0x0800)
  Internet Protocol Version 4, Src: 85.134.37.196 (85.134.37.196), Dst: 192.168.0.101 (192.168.0.101)
      Version: 4
      Header length: 20 bytes
      Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
          0000 00.. = Differentiated Services Codepoint: Default (0x00)
          .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
      Total Length: 52
      Identification: 0x8b63 (35683)
      Flags: 0x02 (Don't Fragment)
          0... .... = Reserved bit: Not set
          .1.. .... = Don't fragment: Set
          ..0. .... = More fragments: Not set
      Fragment offset: 0
      Time to live: 58
      Protocol: TCP (6)
      Header checksum: 0x7909 [correct]
          [Good: True]
          [Bad: False]
      Source: 85.134.37.196 (85.134.37.196)
      Destination: 192.168.0.101 (192.168.0.101)
  Transmission Control Protocol, Src Port: http (80), Dst Port: 51714 (51714), Seq: 1, Ack: 1, Len: 0
      Source port: http (80)
      Destination port: 51714 (51714)
      [Stream index: 5205]
      Sequence number: 1    (relative sequence number)
      Acknowledgement number: 1    (relative ack number)
      Header length: 32 bytes
      Flags: 0x011 (FIN, ACK)
          000. .... .... = Reserved: Not set
          ...0 .... .... = Nonce: Not set
          .... 0... .... = Congestion Window Reduced (CWR): Not set
          .... .0.. .... = ECN-Echo: Not set
          .... ..0. .... = Urgent: Not set
          .... ...1 .... = Acknowledgement: Set
          .... .... 0... = Push: Not set
          .... .... .0.. = Reset: Not set
          .... .... ..0. = Syn: Not set
          .... .... ...1 = Fin: Set
              [Expert Info (Chat/Sequence): Connection finish (FIN)]
                  [Message: Connection finish (FIN)]
                  [Severity level: Chat]
                  [Group: Sequence]
      Window size value: 114
      [Calculated window size: 14592]
      [Window size scaling factor: 128]
      Checksum: 0xd1f9 [validation disabled]
          [Good Checksum: False]
          [Bad Checksum: False]
      Options: (12 bytes)
          No-Operation (NOP)
          No-Operation (NOP)
          Timestamps: TSval 1723049647, TSecr 1723044620
              Kind: Timestamp (8)
              Length: 10
              Timestamp value: 1723049647
              Timestamp echo reply: 1723044620
  
  ---------------------------------------------------------------------------------------------------------------------------------------------------------
  
  No.     Time        Source                Destination           Protocol Length Info
    94688 211.305660  192.168.0.101         85.134.37.196         TCP      66     51714 &gt; http [FIN, ACK] Seq=1127 Ack=2 Win=14656 Len=0 TSval=30409384 TSecr=1723049647
  
  Frame 94688: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
      Arrival Time: Nov  7, 2012 22:55:18.087932000 EET
      Epoch Time: 1352321718.087932000 seconds
      [Time delta from previous captured frame: 0.000264000 seconds]
      [Time delta from previous displayed frame: 0.000452000 seconds]
      [Time since reference or first frame: 211.305660000 seconds]
      Frame Number: 94688
      Frame Length: 66 bytes (528 bits)
      Capture Length: 66 bytes (528 bits)
      [Frame is marked: True]
      [Frame is ignored: False]
      [Protocols in frame: eth:ip:tcp]
      [Coloring Rule Name: HTTP]
      [Coloring Rule String: http || tcp.port == 80]
  Ethernet II, Src: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f), Dst: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
      Destination: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
          Address: D-LinkIn_2f:a4:a4 (14:d6:4d:2f:a4:a4)
          .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
          .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
      Source: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
          Address: HonHaiPr_e7:39:2f (38:59:f9:e7:39:2f)
          .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
          .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
      Type: IP (0x0800)
  Internet Protocol Version 4, Src: 192.168.0.101 (192.168.0.101), Dst: 85.134.37.196 (85.134.37.196)
      Version: 4
      Header length: 20 bytes
      Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
          0000 00.. = Differentiated Services Codepoint: Default (0x00)
          .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
      Total Length: 52
      Identification: 0x4e24 (20004)
      Flags: 0x02 (Don't Fragment)
          0... .... = Reserved bit: Not set
          .1.. .... = Don't fragment: Set
          ..0. .... = More fragments: Not set
      Fragment offset: 0
      Time to live: 64
      Protocol: TCP (6)
      Header checksum: 0xb048 [correct]
          [Good: True]
          [Bad: False]
      Source: 192.168.0.101 (192.168.0.101)
      Destination: 85.134.37.196 (85.134.37.196)
  Transmission Control Protocol, Src Port: 51714 (51714), Dst Port: http (80), Seq: 1127, Ack: 2, Len: 0
      Source port: 51714 (51714)
      Destination port: http (80)
      [Stream index: 5205]
      Sequence number: 1127    (relative sequence number)
      Acknowledgement number: 2    (relative ack number)
      Header length: 32 bytes
      Flags: 0x011 (FIN, ACK)
          000. .... .... = Reserved: Not set
          ...0 .... .... = Nonce: Not set
          .... 0... .... = Congestion Window Reduced (CWR): Not set
          .... .0.. .... = ECN-Echo: Not set
          .... ..0. .... = Urgent: Not set
          .... ...1 .... = Acknowledgement: Set
          .... .... 0... = Push: Not set
          .... .... .0.. = Reset: Not set
          .... .... ..0. = Syn: Not set
          .... .... ...1 = Fin: Set
              [Expert Info (Chat/Sequence): Connection finish (FIN)]
                  [Message: Connection finish (FIN)]
                  [Severity level: Chat]
                  [Group: Sequence]
      Window size value: 229
      [Calculated window size: 14656]
      [Window size scaling factor: 64]
      Checksum: 0x3c7e [validation disabled]
          [Good Checksum: False]
          [Bad Checksum: False]
      Options: (12 bytes)
          No-Operation (NOP)
          No-Operation (NOP)
          Timestamps: TSval 30409384, TSecr 1723049647
              Kind: Timestamp (8)
              Length: 10
              Timestamp value: 30409384
              Timestamp echo reply: 1723049647
      [SEQ/ACK analysis]
          [This is an ACK to the segment in frame: 94686]
          [The RTT to ACK the segment was: 0.000452000 seconds]
  </code></pre>