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At my wits end, FTP related issue

This is a tough one, just judging from the fact that everyone I have had look at this so far can not figure it out. I am running RHE 3, Cpanel/WHM server. Dual Xeon, 2.4 2 GB ram, 2 x 74 GB SCSI. I lease from EV1 servers.net (server has been a dream up until last Thursday when all of this started).

The issue is, FTP uploads, or file uploading in general. When a upload transfer starts, the first couple of seconds are fine, but then everything drops to around 5KB/s, then 3, then 2, then 0.8, etc. and eventually drops out completely. Sometimes late at night, when the user load is down, it does better, but not normal. Server load is fine, averaging 0.7-1.5, memory use is fine in the 20%-30% range, sites run fine, FTP/file downloading works great. Disc > disc transfer works great. We have already reinstalled FTP, tried both Pure/Pro, downgraded to another Cpanel, changed kernels, shut down MySQL/Httpd to see if it helped (did not), swapped out the server (did not help), changed the network cat 5 cable at the server (did not help), and this test / results from the last tech at EV1 that looked at it:
- ICMP was moving 5mbit but tcp was always slow
- drive > drive copying fast
- udp moved decently, never tried at full speed just because tcp never was fixed
- 2 stock kernels and one custom 2.6.7 compile no difference
- we were getting one second lag times in tcp packets sent within ev1

Also, this is not only happening on the main drive but also the backup SCSI drive. So it's not the drive itself.

I am at my wits end on this. Last resort, which I am ready to do, is a total restore using fresh OS install and having to move all my clients over to the new drive. Any ideas anyone?
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MetalAges

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Well, found the issue. EV1servers.net started with a new script on Juy 1. It fights DDos attacks, etc. What happened was, I had a video file that was downloaded the previous days for around 120GB over a two day span. the scriptthought it was an attack and throttled my server. It is aupposed to a) notify me and b) unthrottle after it senses the attack is over. It never did either. It was so new that none of the techs knew to look for that until today when an admin guy I had hired thought to ask about filtering on my server. Sure enough, they found it. All is well! <whew>
If it's any comfort, you're not the first (nor likely the last) to have a thing like this happen... And EV1 is not the first, nor the last, ISP to do something like that:-).

Could you please have CS PAQ this question and refund your points? Just place a (0 point cost) question in the Community Support topic area, with a link back here...

-- Glenn
One other check would of helped a little.  You might want to check the network traffic next time something like this happens.  I wouldn't of helped in this case I don't believe but it is "nice to know" information.
Glad you solved your problem - First thing I thought of is what has your ISP done to its system lately - especillay since you indicated that it worked great before.

Don't forget to follow up on the suggestion from Gns
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