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9.3

TCP reset flag present when trying to browse internet from any PC at location

Asked by greenbeanx81 in TCP/IP, Cisco PIX Firewall, DSL Lines / Cable Internet

Tags: TCP reset flag when trying to browse websites

Hello All,

      I am experiencing a strange issue at a customers site. Last night they had a power outage. This morning they reported that they could not browse the internet from any PC at their location. The customer has a DSL connection connected to a PIX 506E connected to a layer three switch. I am receiving a TCP reset flag sent from the web server of the site I am trying to browse. I can ping ip addresses and preform nslookup but I can not browse the internet. I have tried telneting to a webserver on port 80 but I receive nothing. My http web capture is below. Any suggestions why this is happening. I am currently waiting for the DSL company to call me back.

HTTP web capture:


No.     Time        Source                Destination           Protocol Info
      1 0.000000    172.21.173.207        72.14.253.104         TCP      fjmpss > http [SYN] Seq=0 Win=65535 Len=0 MSS=1260

Frame 1 (62 bytes on wire, 62 bytes captured)
Ethernet II, Src: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f), Dst: Cisco_d4:10:80 (00:13:1a:d4:10:80)
Internet Protocol, Src: 172.21.173.207 (172.21.173.207), Dst: 72.14.253.104 (72.14.253.104)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 48
    Identification: 0xd74b (55115)
    Flags: 0x04 (Don't Fragment)
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (0x06)
    Header checksum: 0x8420 [correct]
    Source: 172.21.173.207 (172.21.173.207)
    Destination: 72.14.253.104 (72.14.253.104)
Transmission Control Protocol, Src Port: fjmpss (2509), Dst Port: http (80), Seq: 0, Len: 0
    Source port: fjmpss (2509)
    Destination port: http (80)
    Sequence number: 0    (relative sequence number)
    Header length: 28 bytes
    Flags: 0x02 (SYN)
    Window size: 65535
    Checksum: 0x7c77 [correct]
    Options: (8 bytes)

No.     Time        Source                Destination           Protocol Info
      2 0.049646    72.14.253.104         172.21.173.207        TCP      http > fjmpss [SYN, ACK] Seq=0 Ack=1 Win=5720 Len=0 MSS=1380

Frame 2 (62 bytes on wire, 62 bytes captured)
Ethernet II, Src: Cisco_d4:10:80 (00:13:1a:d4:10:80), Dst: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f)
Internet Protocol, Src: 72.14.253.104 (72.14.253.104), Dst: 172.21.173.207 (172.21.173.207)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 48
    Identification: 0xa943 (43331)
    Flags: 0x00
    Fragment offset: 0
    Time to live: 48
    Protocol: TCP (0x06)
    Header checksum: 0x4229 [correct]
    Source: 72.14.253.104 (72.14.253.104)
    Destination: 172.21.173.207 (172.21.173.207)
Transmission Control Protocol, Src Port: http (80), Dst Port: fjmpss (2509), Seq: 0, Ack: 1, Len: 0
    Source port: http (80)
    Destination port: fjmpss (2509)
    Sequence number: 0    (relative sequence number)
    Acknowledgement number: 1    (relative ack number)
    Header length: 28 bytes
    Flags: 0x12 (SYN, ACK)
    Window size: 5720
    Checksum: 0x2d89 [correct]
    Options: (8 bytes)
    [SEQ/ACK analysis]

No.     Time        Source                Destination           Protocol Info
      3 0.049715    172.21.173.207        72.14.253.104         TCP      fjmpss > http [ACK] Seq=1 Ack=1 Win=65535 Len=0

Frame 3 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f), Dst: Cisco_d4:10:80 (00:13:1a:d4:10:80)
Internet Protocol, Src: 172.21.173.207 (172.21.173.207), Dst: 72.14.253.104 (72.14.253.104)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 40
    Identification: 0xd74c (55116)
    Flags: 0x04 (Don't Fragment)
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (0x06)
    Header checksum: 0x8427 [correct]
    Source: 172.21.173.207 (172.21.173.207)
    Destination: 72.14.253.104 (72.14.253.104)
Transmission Control Protocol, Src Port: fjmpss (2509), Dst Port: http (80), Seq: 1, Ack: 1, Len: 0
    Source port: fjmpss (2509)
    Destination port: http (80)
    Sequence number: 1    (relative sequence number)
    Acknowledgement number: 1    (relative ack number)
    Header length: 20 bytes
    Flags: 0x10 (ACK)
    Window size: 65535
    Checksum: 0x7055 [correct]
    [SEQ/ACK analysis]

No.     Time        Source                Destination           Protocol Info
      4 0.052137    172.21.173.207        72.14.253.104         HTTP     GET / HTTP/1.1

Frame 4 (753 bytes on wire, 753 bytes captured)
Ethernet II, Src: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f), Dst: Cisco_d4:10:80 (00:13:1a:d4:10:80)
Internet Protocol, Src: 172.21.173.207 (172.21.173.207), Dst: 72.14.253.104 (72.14.253.104)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 739
    Identification: 0xd74d (55117)
    Flags: 0x04 (Don't Fragment)
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (0x06)
    Header checksum: 0x816b [correct]
    Source: 172.21.173.207 (172.21.173.207)
    Destination: 72.14.253.104 (72.14.253.104)
Transmission Control Protocol, Src Port: fjmpss (2509), Dst Port: http (80), Seq: 1, Ack: 1, Len: 699
    Source port: fjmpss (2509)
    Destination port: http (80)
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 700    (relative sequence number)]
    Acknowledgement number: 1    (relative ack number)
    Header length: 20 bytes
    Flags: 0x18 (PSH, ACK)
    Window size: 65535
    Checksum: 0xa9b5 [correct]
Hypertext Transfer Protocol

No.     Time        Source                Destination           Protocol Info
      5 2.980882    172.21.173.207        72.14.253.104         HTTP     [TCP Retransmission] GET / HTTP/1.1

Frame 5 (753 bytes on wire, 753 bytes captured)
Ethernet II, Src: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f), Dst: Cisco_d4:10:80 (00:13:1a:d4:10:80)
Internet Protocol, Src: 172.21.173.207 (172.21.173.207), Dst: 72.14.253.104 (72.14.253.104)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 739
    Identification: 0xd766 (55142)
    Flags: 0x04 (Don't Fragment)
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (0x06)
    Header checksum: 0x8152 [correct]
    Source: 172.21.173.207 (172.21.173.207)
    Destination: 72.14.253.104 (72.14.253.104)
Transmission Control Protocol, Src Port: fjmpss (2509), Dst Port: http (80), Seq: 1, Ack: 1, Len: 699
    Source port: fjmpss (2509)
    Destination port: http (80)
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 700    (relative sequence number)]
    Acknowledgement number: 1    (relative ack number)
    Header length: 20 bytes
    Flags: 0x18 (PSH, ACK)
    Window size: 65535
    Checksum: 0xa9b5 [correct]
    [SEQ/ACK analysis]
Hypertext Transfer Protocol

No.     Time        Source                Destination           Protocol Info
      6 8.989518    172.21.173.207        72.14.253.104         HTTP     [TCP Retransmission] GET / HTTP/1.1

Frame 6 (753 bytes on wire, 753 bytes captured)
Ethernet II, Src: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f), Dst: Cisco_d4:10:80 (00:13:1a:d4:10:80)
Internet Protocol, Src: 172.21.173.207 (172.21.173.207), Dst: 72.14.253.104 (72.14.253.104)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 739
    Identification: 0xd798 (55192)
    Flags: 0x04 (Don't Fragment)
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (0x06)
    Header checksum: 0x8120 [correct]
    Source: 172.21.173.207 (172.21.173.207)
    Destination: 72.14.253.104 (72.14.253.104)
Transmission Control Protocol, Src Port: fjmpss (2509), Dst Port: http (80), Seq: 1, Ack: 1, Len: 699
    Source port: fjmpss (2509)
    Destination port: http (80)
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 700    (relative sequence number)]
    Acknowledgement number: 1    (relative ack number)
    Header length: 20 bytes
    Flags: 0x18 (PSH, ACK)
    Window size: 65535
    Checksum: 0xa9b5 [correct]
    [SEQ/ACK analysis]
Hypertext Transfer Protocol

No.     Time        Source                Destination           Protocol Info
      7 10.098576   72.14.253.104         172.21.173.207        TCP      http > fjmpss [FIN, ACK] Seq=1 Ack=1 Win=5720 Len=0

Frame 7 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Cisco_d4:10:80 (00:13:1a:d4:10:80), Dst: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f)
Internet Protocol, Src: 72.14.253.104 (72.14.253.104), Dst: 172.21.173.207 (172.21.173.207)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 40
    Identification: 0xa944 (43332)
    Flags: 0x00
    Fragment offset: 0
    Time to live: 48
    Protocol: TCP (0x06)
    Header checksum: 0x4230 [correct]
    Source: 72.14.253.104 (72.14.253.104)
    Destination: 172.21.173.207 (172.21.173.207)
Transmission Control Protocol, Src Port: http (80), Dst Port: fjmpss (2509), Seq: 1, Ack: 1, Len: 0
    Source port: http (80)
    Destination port: fjmpss (2509)
    Sequence number: 1    (relative sequence number)
    Acknowledgement number: 1    (relative ack number)
    Header length: 20 bytes
    Flags: 0x11 (FIN, ACK)
    Window size: 5720
    Checksum: 0x59fc [correct]

No.     Time        Source                Destination           Protocol Info
      8 10.098657   172.21.173.207        72.14.253.104         TCP      fjmpss > http [ACK] Seq=700 Ack=2 Win=65535 Len=0

Frame 8 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f), Dst: Cisco_d4:10:80 (00:13:1a:d4:10:80)
Internet Protocol, Src: 172.21.173.207 (172.21.173.207), Dst: 72.14.253.104 (72.14.253.104)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 40
    Identification: 0xd7a1 (55201)
    Flags: 0x04 (Don't Fragment)
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (0x06)
    Header checksum: 0x83d2 [correct]
    Source: 172.21.173.207 (172.21.173.207)
    Destination: 72.14.253.104 (72.14.253.104)
Transmission Control Protocol, Src Port: fjmpss (2509), Dst Port: http (80), Seq: 700, Ack: 2, Len: 0
    Source port: fjmpss (2509)
    Destination port: http (80)
    Sequence number: 700    (relative sequence number)
    Acknowledgement number: 2    (relative ack number)
    Header length: 20 bytes
    Flags: 0x10 (ACK)
    Window size: 65535
    Checksum: 0x6d99 [correct]
    [SEQ/ACK analysis]

No.     Time        Source                Destination           Protocol Info
      9 10.099079   172.21.173.207        72.14.253.104         TCP      fjmpss > http [FIN, ACK] Seq=700 Ack=2 Win=65535 Len=0

Frame 9 (54 bytes on wire, 54 bytes captured)
Ethernet II, Src: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f), Dst: Cisco_d4:10:80 (00:13:1a:d4:10:80)
Internet Protocol, Src: 172.21.173.207 (172.21.173.207), Dst: 72.14.253.104 (72.14.253.104)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 40
    Identification: 0xd7a6 (55206)
    Flags: 0x04 (Don't Fragment)
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (0x06)
    Header checksum: 0x83cd [correct]
    Source: 172.21.173.207 (172.21.173.207)
    Destination: 72.14.253.104 (72.14.253.104)
Transmission Control Protocol, Src Port: fjmpss (2509), Dst Port: http (80), Seq: 700, Ack: 2, Len: 0
    Source port: fjmpss (2509)
    Destination port: http (80)
    Sequence number: 700    (relative sequence number)
    Acknowledgement number: 2    (relative ack number)
    Header length: 20 bytes
    Flags: 0x11 (FIN, ACK)
    Window size: 65535
    Checksum: 0x6d98 [correct]

No.     Time        Source                Destination           Protocol Info
     10 10.149640   72.14.253.104         172.21.173.207        TCP      http > fjmpss [RST] Seq=2 Win=0 Len=0

Frame 10 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Cisco_d4:10:80 (00:13:1a:d4:10:80), Dst: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f)
Internet Protocol, Src: 72.14.253.104 (72.14.253.104), Dst: 172.21.173.207 (172.21.173.207)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 40
    Identification: 0xa946 (43334)
    Flags: 0x00
    Fragment offset: 0
    Time to live: 48
    Protocol: TCP (0x06)
    Header checksum: 0x422e [correct]
    Source: 72.14.253.104 (72.14.253.104)
    Destination: 172.21.173.207 (172.21.173.207)
Transmission Control Protocol, Src Port: http (80), Dst Port: fjmpss (2509), Seq: 2, Len: 0
    Source port: http (80)
    Destination port: fjmpss (2509)
    Sequence number: 2    (relative sequence number)
    Acknowledgment number: Broken TCP. The acknowledge field is nonzero while the ACK flag is not set
    Header length: 20 bytes
    Flags: 0x04 (RST)
    Window size: 0
    Checksum: 0xf62a [correct]

No.     Time        Source                Destination           Protocol Info
     11 24.411687   172.21.173.207        72.14.253.147         HTTP     GET /firefox?client=firefox-a&rls=org.mozilla:en-US:official HTTP/1.1

Frame 11 (677 bytes on wire, 677 bytes captured)
Ethernet II, Src: DellPcba_b2:2e:3f (00:0d:56:b2:2e:3f), Dst: Cisco_d4:10:80 (00:13:1a:d4:10:80)
Internet Protocol, Src: 172.21.173.207 (172.21.173.207), Dst: 72.14.253.147 (72.14.253.147)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
    Total Length: 663
    Identification: 0xd821 (55329)
    Flags: 0x04 (Don't Fragment)
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (0x06)
    Header checksum: 0x80b8 [correct]
    Source: 172.21.173.207 (172.21.173.207)
    Destination: 72.14.253.147 (72.14.253.147)
Transmission Control Protocol, Src Port: jbroker (2506), Dst Port: http (80), Seq: 1, Ack: 1, Len: 623
    Source port: jbroker (2506)
    Destination port: http (80)
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 624    (relative sequence number)]
    Acknowledgement number: 1    (relative ack number)
    Header length: 20 bytes
    Flags: 0x19 (FIN, PSH, ACK)
    Window size: 65535
    Checksum: 0x857b [correct]
Hypertext Transfer Protocol
[+][-]02/01/08 05:24 AM, ID: 20796288Accepted Solution

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About this solution

Zones: TCP/IP, Cisco PIX Firewall, DSL Lines / Cable Internet
Tags: TCP reset flag when trying to browse websites
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Solution Provided By: blu
Participating Experts: 3
Solution Grade: A
 
[+][-]02/01/08 12:06 PM, ID: 20800141Expert Comment

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