sudden loss of internet file sharing

**Wyzcrak** · 10-31-2003, 01:00 AM

At my house, I've had Windows File Sharing working on my WinXP Pro box for quite some time, and I'm using SMB such that all of the traffic travels over port 445. I do have a hardware firewall, but the port 445 is forwarded to my WinXP Pro box for both TCP and UDP.

I cannot stress enough that this has been working for months upon months. The name of the shared folder on my box is Export. I have SUCCESSFULLY been mounting \\my.domain.name\Export as a network drive from work, over the Internet, for some time. I'd copy files from the share to my desktop at work, no problem. I'd play songs from my home share in my work machine's Winamp, no problem.

Then one day it doesn't work. BAM, out of nowhere. I hadn't changed a THING.

I attempt to connect from SEVERAL remote sources, suspecting a network change at work is to blame. But no... nothing outside my home LAN is able to connect to the share on my home box. All the boxes in the LAN can connect to the share without issue.

And I'm not talking authentication here. They can't "connect." The error is something like "the network name cannot be found." While I've always mounted using the DNS address of my machine (the same FQDN in my DNS records as is assigned to the WinXP box itself), I tried mounting via DNS address and IP address. No luck.

netstat -a:

TCP home:microsoft-ds home.digitalcreations.cc:0 LISTENING
UDP home:microsoft-ds *:*

services file:

microsoft-ds 445/tcp
microsoft-ds 445/udp

I've called the ISP, asking if they placed a block on that port via some means. They claim that I am behind no firewall, and no ports are blocked. :?

So, what do I do? I've double-checked all of the settings on my WinXP box, but I've no reason to think any of them is incorrect as one day this was working and the next day it was not. When I telnet from the outside world to 445 of my house, the connection is not refused. It just connects and sits there. This is the only validation I've done that my firewall is routing properly. Several, several other applications route through the firewall as we speak; I really don't have a reason to suspect firewall failure/oddities.

I do install every Windows Update "fix" that comes down the pipe. Maybe one of those is to blame.

I just don't know. All I know is, accessing my home files from work was never so easy, and I'd really like to have that luxury back. I have SCP and file transfer via VNC, but it just isn't as convenient.

Anything you guys can do to help me here would really be appreciated.

Wyzcrak

P.S. If you have comments about the validity of sharing files on the Internet, I really don't want them tainting this thread. If you feel compelled to share them with me, please PM me.

**Quarath** · 10-31-2003, 10:05 AM

Is your IP Address from your internet provider static or dynamic. Some dynamic IP's don't change very often so you may have the same one for several months then all of a sudden have a different one. Check your router and see what the WAN IP address beeing assigned is and if it is the same as what you are attempting to access.

**Wyzcrak** · 10-31-2003, 10:43 AM

Quote:

Originally Posted by Quarath

Check your router and see what the WAN IP address beeing assigned is and if it is the same as what you are attempting to access.

Good call, but...

Quote:

Originally Posted by Wyzcrak

I have SCP and file transfer via VNC, but it just isn't as convenient.

... what I meant was that SCP and VNC are working flawlessly from the outside world, one of the many ways I have of knowing that I've got all of my addresses right.

Wyzcrak

**Quarath** · 10-31-2003, 01:50 PM

my bad for skimming

Cobra · 12-02-2003, 02:35 PM

I found the networking in XP to be flakey in MY exp. I run 2000 Pro on all my machines...

verbose · 12-02-2003, 05:51 PM

I was going to run a tcptraceroute for you from my location, until I found out that the provider I'm on at this moment filters TCP 139 and 445, even though the techs I just spoke to swear they don't. I emailed them the evidence that they do; waiting for them to remove those blasted filters, then I'll have a look.

verbose · 12-02-2003, 07:31 PM

(Assuming your host is the "home.digitalcreations.cc" listed in your netstat output)

Something is filtering TCP port 445. It's either the egress interface right before your local cable hop, or something local on your end. It's "filtered" too, as in "packet is dropped on the floor, nothing is sent back to the packet source", not a "port is closed" RST response.

Quote:

Originally Posted by Random High TCP port

-bash-2.05b$ tcptraceroute home.digitalcreations.cc 3111
Selected device fxp0, address 204.2.8.10, port 3245 for outgoing packets
Tracing the path to home.digitalcreations.cc (24.33.23.173) on TCP port 3111, 30 hops max
1 gw.hstntx.ledhazard.net (204.2.8.1) 2.580 ms 8.420 ms 9.654 ms
2 128.241.4.53 (128.241.4.53) 10.040 ms 8.548 ms 9.710 ms
3 ge-0-1-0-4.r00.hstntx01.us.bb.verio.net (129.250.30.209) 9.691 ms 9.035 ms 9.362 ms
4 p16-1-1-1.r21.dllstx01.us.bb.verio.net (129.250.5.4) 9.653 ms 8.679 ms 10.026 ms
5 pop1-dls-P3-2.atdn.net (66.185.133.93) 9.362 ms 8.823 ms 9.701 ms
6 bb1-dls-P0-0.atdn.net (66.185.133.80) 10.046 ms 8.478 ms 9.675 ms
7 bb1-hou-P6-0.atdn.net (66.185.152.133) 11.209 ms 11.490 ms 11.195 ms
8 bb1-atm-P7-0.atdn.net (66.185.152.184) 43.635 ms 43.296 ms 43.432 ms
9 pop1-atm-P0-0.atdn.net (66.185.147.193) 43.554 ms 43.555 ms 43.473 ms
10 rr-memphis.atdn.net (66.185.147.202) 54.629 ms 54.681 ms 54.651 ms
11 pos2-0.mmphtntu-rtr2.midsouth.rr.com (24.92.65.10) 55.119 ms 55.074 ms 55.019 ms
12 pos1-1-0.mmphtnms-rtr1.midsouth.rr.com (24.92.65.113) 55.446 ms 55.628 ms 55.826 ms
13 fas1-0.mmphtnms-ubr1.midsouth.rr.com (24.24.127.74) 58.001 ms 56.289 ms 61.463 ms
14 cpe-024-033-023-173.midsouth.rr.com (24.33.23.173) [closed] 68.024 ms 64.960 ms 63.731 ms

Quote:

Originally Posted by TCP port 445

-bash-2.05b$ tcptraceroute home.digitalcreations.cc 445
Selected device fxp0, address 204.2.8.10, port 3241 for outgoing packets
Tracing the path to home.digitalcreations.cc (24.33.23.173) on TCP port 445, 30 hops max
1 gw.hstntx.ledhazard.net (204.2.8.1) 9.891 ms 8.771 ms 9.349 ms
2 128.241.4.53 (128.241.4.53) 9.692 ms 8.889 ms 10.045 ms
3 ge-0-1-0-4.r00.hstntx01.us.bb.verio.net (129.250.30.209) 9.350 ms 7.976 ms 9.691 ms
4 p16-1-1-1.r21.dllstx01.us.bb.verio.net (129.250.5.4) 10.044 ms 5.466 ms 9.376 ms
5 pop1-dls-P3-2.atdn.net (66.185.133.93) 10.052 ms 5.696 ms 7.481 ms
6 bb1-dls-P0-0.atdn.net (66.185.133.80) 9.334 ms 6.672 ms 5.663 ms
7 bb1-hou-P6-0.atdn.net (66.185.152.133) 11.212 ms 11.178 ms 11.049 ms
8 bb1-atm-P7-0.atdn.net (66.185.152.184) 43.285 ms 43.461 ms 43.224 ms
9 pop1-atm-P0-0.atdn.net (66.185.147.193) 43.547 ms 43.572 ms 43.570 ms
10 rr-memphis.atdn.net (66.185.147.202) 54.619 ms 54.842 ms 54.680 ms
11 pos2-0.mmphtntu-rtr2.midsouth.rr.com (24.92.65.10) 55.207 ms 55.036 ms 55.084 ms
12 pos1-1-0.mmphtnms-rtr1.midsouth.rr.com (24.92.65.113) 56.394 ms 55.738 ms 55.757 ms
13 fas1-0.mmphtnms-ubr1.midsouth.rr.com (24.24.127.74) 56.722 ms 59.896 ms 56.270 ms
14 * * *
15 * * *
16 * * *
17 * * *
^C

10-31-2003, 01:00 AM	#1 (permalink)
Wyzcrak Join Date: May 2003 Location: Memphis, TN Posts: 14,139	sudden loss of internet file sharing At my house, I've had Windows File Sharing working on my WinXP Pro box for quite some time, and I'm using SMB such that all of the traffic travels over port 445. I do have a hardware firewall, but the port 445 is forwarded to my WinXP Pro box for both TCP and UDP. I cannot stress enough that this has been working for months upon months. The name of the shared folder on my box is Export. I have SUCCESSFULLY been mounting \\my.domain.name\Export as a network drive from work, over the Internet, for some time. I'd copy files from the share to my desktop at work, no problem. I'd play songs from my home share in my work machine's Winamp, no problem. Then one day it doesn't work. BAM, out of nowhere. I hadn't changed a THING. I attempt to connect from SEVERAL remote sources, suspecting a network change at work is to blame. But no... nothing outside my home LAN is able to connect to the share on my home box. All the boxes in the LAN can connect to the share without issue. And I'm not talking authentication here. They can't "connect." The error is something like "the network name cannot be found." While I've always mounted using the DNS address of my machine (the same FQDN in my DNS records as is assigned to the WinXP box itself), I tried mounting via DNS address and IP address. No luck. netstat -a: TCP home:microsoft-ds home.digitalcreations.cc:0 LISTENING UDP home:microsoft-ds : services file: microsoft-ds 445/tcp microsoft-ds 445/udp I've called the ISP, asking if they placed a block on that port via some means. They claim that I am behind no firewall, and no ports are blocked. :? So, what do I do? I've double-checked all of the settings on my WinXP box, but I've no reason to think any of them is incorrect as one day this was working and the next day it was not. When I telnet from the outside world to 445 of my house, the connection is not refused. It just connects and sits there. This is the only validation I've done that my firewall is routing properly. Several, several other applications route through the firewall as we speak; I really don't have a reason to suspect firewall failure/oddities. I do install every Windows Update "fix" that comes down the pipe. Maybe one of those is to blame. I just don't know. All I know is, accessing my home files from work was never so easy, and I'd really like to have that luxury back. I have SCP and file transfer via VNC, but it just isn't as convenient. Anything you guys can do to help me here would really be appreciated. Wyzcrak P.S. If you have comments about the validity of sharing files on the Internet, I really don't want them tainting this thread. If you feel compelled to share them with me, please PM me.

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10-31-2003, 10:05 AM	#2 (permalink)
Quarath Join Date: May 2003 Location: Utah Age: 36 Posts: 741	Is your IP Address from your internet provider static or dynamic. Some dynamic IP's don't change very often so you may have the same one for several months then all of a sudden have a different one. Check your router and see what the WAN IP address beeing assigned is and if it is the same as what you are attempting to access.

10-31-2003, 01:50 PM	#4 (permalink)
Quarath Join Date: May 2003 Location: Utah Age: 36 Posts: 741	my bad for skimming

12-02-2003, 02:35 PM	#5 (permalink)
Cobra Join Date: May 2003 Location: Mesa Age: 32 Posts: 692	I found the networking in XP to be flakey in MY exp. I run 2000 Pro on all my machines...

12-02-2003, 05:51 PM	#6 (permalink)
verbose Join Date: Nov 2003 Location: Lincoln, Nebraska, USA Age: 27 Posts: 409	I was going to run a tcptraceroute for you from my location, until I found out that the provider I'm on at this moment filters TCP 139 and 445, even though the techs I just spoke to swear they don't. I emailed them the evidence that they do; waiting for them to remove those blasted filters, then I'll have a look.

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