My Two Website Going Offline and Back Online Out Sporadically for 3-5 Minutes Each Time

We run two websites which are located on two separate Dell R200 servers. The dells each have two nic's.  The first nic is for internal (vpn) usage and the second is for the web connection.  They've been up and connecting without any issues for the better part of a year.

We initially installed Untangle on a supermicro PC. The ethernet connection for the web connections are 74.x.x.1 (and alias 74.x.x.2) was set up in the untangle as the WAN connection.

We also had two subnets (LANS) coming off of two network ports which were 172.20.2.1 and 172.30.2.1.

The Web servers were connected directly to the Untangle with no switch between.

Approximately 2 months ago, we started to experience intermittent disconnects to one or the other Web servers. It happened on both subnets, rarely happening in tandem and usually happening on one or the other. These disconnects typically would last anywhere from 3 to 5 min. with connectivity being fully restored after that.

On Friday afternoon, the frequency of these cutouts increased noticeably.

Thinking that there was something wrong with the Untangle server, we swapped the device out to an Untangle U50 that we had as a backup. We ported all the settings over to the new appliance and brought it online.

Everything seemed to be fine in that it had not "gone off-line" since Saturday morning, until this morning at about 9:37 EST, both subnets went off-line. As usual, they came back within about 10 min.

The Web servers are definitely not going down, because each is running two network cards and non-Untangle subnet is staying up throughout the whole process.

I just now received notification that the 172.20.2.1 connection went down again.
bhungerAsked:
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Davis McCarnOwnerCommented:
I think your problem is with your ISP.
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bhungerAuthor Commented:
That's what I'm thinking.  I've swapped out the switch, router, changed nic's on one of the two web servers.

The fact that it occurs on either wan, but not BOTH (at the same time) is troublesome though.  Wouldn't the block of their wan ip's (that they issued us) perform the same?
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Davis McCarnOwnerCommented:
It's hard to know.  I have had to deal with partially fried boxes on Time Warner clients and it can be a bear.
Get a copy of PingPlotter Free ( http://www.pingplotter.com/freeware.html ) and either point it at your server(s) from outside or, if you can route through the webs ip, point it at www.microsoft.com, and watch the results.  It will show you where the break is.
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bhungerAuthor Commented:
Experts exchange labelled this question, "Abandoned."  I was waiting for more feedback.  Oh well.
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Davis McCarnOwnerCommented:
Did you see my post?
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bhungerAuthor Commented:
I ended up replacing the switch with a better smart switch.  I also noticed that I was running two gateways on one of the servers (oops).  Still not sure why both were cutting in and out.  Thanks Davis!
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bhungerAuthor Commented:
Last followup for anyone checking:  We're thinking the problem lies in the slow performance of the back-end db server.  We correlated a number of processes on the db server to the outages (or large slow downs) on the web servers.
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