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This problem is annoying me for 2 weeks!

Unexpectedly, after migrating to Ubuntu I can't upload any thing via ADSL, also I can't send any comment in weblogs.

The odd point if I use proxy/ant-ifilter (as in Tor or FreeGate) I can upload normally!!

The upload is just my problem; Downloading files and opening pages are ok!

Also when I use GPRS (mobile internet) I don't have any problem!!!

There's not any problem in windows: both download and upload are ok, using ADSL line.

My Line: ADSL (send rate: 512 Kbit/s, receive rate: 2048 Kbit/s)

My Modem: D-Link 2520U

My installed operating systems are both Ubuntu 10.04 & 12.04.
I also checked "uploading" on 10.10, 12.04 and 12.10 in live mode => failed!

My browsers: firefox 17.0.1 and opera

What does upload mean in this case? Am I test a file to upload using ftp or trying to attach a file in gmail?

I can't comment on weblogs and forum in any case! (but using proxy it is ok)
I can't upload a file to uplod-center sites in any case!

I can upload to images.google.com but using proxy it works a few better!
I can open all web pages!

The below picture is the result of my attempt to attaching a file to AOL using Thunderbird.

BUT my try for gmail was successful! it seems there is not any problem with gmail services!!!

FTP: I could upload a txt file (10 KB), but in next attempts for uploading a bigger file (pdf: 2MB), I couldn't! (Using filezilla)

Result of ping 4.2.2.4 is here:

naik@KIAN:~$ ping 4.2.2.4
PING 4.2.2.4 (4.2.2.4) 56(84) bytes of data.
64 bytes from 4.2.2.4: icmp_seq=1 ttl=50 time=204 ms
64 bytes from 4.2.2.4: icmp_seq=3 ttl=50 time=205 ms
64 bytes from 4.2.2.4: icmp_seq=4 ttl=50 time=204 ms
64 bytes from 4.2.2.4: icmp_seq=5 ttl=50 time=203 ms
64 bytes from 4.2.2.4: icmp_seq=6 ttl=50 time=202 ms

I installed "nload" and glance its output in terminal during uploading a file. the below picture was captured during upload-progress from nload output:

It shows that I have upload, but I didn't get the final link. firefox was showing me that is trying to upload and nothing. I also try to post here without proxy, nload showed me there is upload but my comment wasn't sent at last! It's weird!!!

What more information do you need around this problem?

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