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joepmo

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Just thought I would share an issue I have been dealing with over the past couple of days. Installed KMS 6.5.2 about 2 weeks ago and it has been running like a champ.

I went to connect some users at our remote offices using Webmail, which lasted about a day before they started complaining of it taking 30 plus seconds to load the login page and 1-3 minutes to open an email. The kicker is that this office has 4 low utilization users on a T1 connection, while I no issues connecting from my house over a ADSL connection that 3 of us are using simultaneously.

So I did a remote support session to see what was going and eliminate all the usual suspects:

1) Outdated hardware - nope, Pentium 4 class, 512mb RAM
2) Out of date OS - nope, Windows XPsp2 - same as my home machine.
3) Too many apps running - nope, closed everything out except browser.
4) Cached files - maybe part of the problem - 2 users had 2Gb of temp files, cleaned them out and cranked cache size down.
5) VPN client - a couple of users had legacy VPN clients autostarting that connected to one of our other networks, shut these off for testing.
6)DNS issues - could ping and tracert okay by name, but just in case I also accessed site by IP address.
7) Java version-updated machines to latest Java runtime, because some were running like version 1.4.

Okay after all of the above things, still had big lag issues in accessing log in page and opening email. Mad Proceeded to bang head on desk, which apparently shook loose more ideas.

Reconnected to problem machines, downloaded Opera and Firefox (not my machine, so I usually don't care what browser the user chooses) and Voila! Lag issues disappeared. Had users connect multiple times using both browsers and confirmed. Every time they used IE (version 6 I believe) they had big lag issues that disappeared with the other browsers. Yes, I know IE is a big, fat resource hog but I unfortunately I am not knowledgeable enough to pin down where the issue is within IE. I assume there is something that MS is doing that is non-standard.

Users had no issues switching browsers, so problem solved for me.
Hope this helps if someone else has experienced similar issues.
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My IT Indy

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I think my wristwatch has more than 512MB of ram.

-
My IT Indy
Kerio Certified Reseller and Hosted Provider
http://www.myitindy.com
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Pavel Dobry (Kerio)

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Have you enabled reverse DNS lookups in the KMS settings? Because this is a common cause of long delays if the DNS server is not able to resolve reverse IP address lookups for clients. If so, disable it.
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rigo

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Would check what is being loaded in IE:

Tools--> Internet Options--> Programs--> Manage add-ons--> Add-ons currently loaded in Interner Explorer

And just Turn Off all the stuff that is not used, sometimes users have toolbars and other blogware running.

Also run TrendMicro's HouseCall with Java kernel http://www.trendsecure.com/portal/en-US/tools/security_tools /housecall

The other thing is to do nothing and get them all to run Firefox Smile and just stay away from IE all together, I encourage all to use it as primary browser.
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ikheetleon

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I have exact the same issue. Running Kerio 6.4.2. On firefox it's very fast, on IE (latest version) it's horrible slow. PC is a clean install, no plugins/toolbars or anything like that. It seems like the small icons take forever to load.
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joepmo

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Quote:

Have you enabled reverse DNS lookups in the KMS settings? Because this is a common cause of long delays if the DNS server is not able to resolve reverse IP address lookups for clients. If so, disable it.


By this is the poster referrring to "Log hostnames for incoming connections" on Advanced Options->Miscellaneous tab? If so, then yes it was checked and I have now unchecked it. Will test some more later today.

Thanks for the responses.
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winkelman

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joepmo wrote on Thu, 21 August 2008 13:48

By this is the poster referrring to "Log hostnames for incoming connections" on Advanced Options->Miscellaneous tab?


Yes, I think so.

On a side note: I can see how a failure to do reverse DNS lookups on the server might slow down the client experience. I however cannot see how the client browser could affect this; making it slow for IE and not for other browsers. It's not the clients doing any reverse DNS-ing... So I think your problem lies within IE or one of its loaded add-ons, etc.
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sedell

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You could try disabling "Check for publisher's certificate revocation" and "Check for server certificate revocation" in IE's advanced options. Sometimes these can cause the browser to lag out while downloading certificate revocation lists. If that fixes the issue, since it only happens to some of your remote machines, it could indicate a local network or firewall issue at the remote site interfering with the CRL downloads.

Scott
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scottwilkins

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I noticed this on a rare occasion, not all the time. I.E. sometimes just doesn't seem to flow well in some accounts, others it does just fine. At first I thought it was due to the size of the store for the user, but found it to occur on others much smaller now.
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winkelman

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The only thing I've noticed slowing down the browser (any browser, not specifically IE) is if a user has created an elaborate folder structure. This display of the state of this folder tree (opened or closed folders) is rendered by the browser and this is pretty slow.

For fairness: I have no actual user with that many folders to notice this, but I have one special 'archive' user to which I transfer all mail from former employees, so this user actually has a mailbox of many users combined. This user has about 2800 folders (and 8.5Gb, but the size doesn't seem to cause any slowness).

Once loaded, all is fine (also browsing/opening/closing folders), but deleting or creating another folder takes about 10-20 seconds of 100% CPU on the client.
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freakinvibe

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I guess it is a reverse DNS lookup issue as described already in this thread. And I think the different browsers use different proxy settings.

Please compare the proxy settings of your Firefox to the proxy settings of IE. Also switch off reverse DNS lookup on the KMS.

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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winkelman

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freakinvibe wrote on Mon, 25 August 2008 14:15

I guess it is a reverse DNS lookup issue as described already in this thread.

The client is not doing any reverse DNS, just the server. And the reason there being AFAIK only to have domain names in logs instead of IP addresses. (Why would the client who is doing nothing but view a website (webmail) need to do any reverse DNS?)

So how could that affect some browsers on clients but not others?
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ikheetleon

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It's not a Reverse DNS issue. I've uncheck the DNS option in advanced setting, and IE is still slow while Firefox is fast. Both use the samen proxy server. It's something with IE and Kerio. My best guess is some sort of image download problemen via https with IE. The text displays quite fast, but the small icons take up to 30 seconds to load. Firefox display's the page instantly. Same connection, same proxy, same account.
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freakinvibe

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Quote:

So how could that affect some browsers on clients but not others?

<_a.t_>winkelman: As I said in my previous post, it can happen if different browsers go out through different IP addresses. One IP address reverse resolves well, the other times out. I know that we are talking about a server lookup.

But as ikheetleon is saying, he has the same proxy settings for both browsers, so my initial thought was wrong. But I don't think, it can be some IE plugins. Other pages would be slow as well, wouldn't they?

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
freakinvibe

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Quote:

You could try disabling "Check for publisher's certificate revocation" and "Check for server certificate revocation" in IE's advanced options.

Have you tried that already? We had some problems with that setting enabled as well.

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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