Slow speed through client mapped drive

[Martin van der Meer]

Hi,

I have a Win 2008 R2 with XA 6.0 and connecting client drives at logon.
Accessing published desktop is done through Online Plugin.

When i want to copy paste somhting from client drive to server mapping it is very slow.
Like 1 KB/sec or slower.

I have read the article http://support.citrix.com/article/CTX123995 and enabled Asynchronous writes in the XA policies, but it is not helping.

How knows a solution?

regards,

Martin

[Thomas Uetrecht]

In our situation it looks like it is a DNS issue. As soon as the Citrix server is able to resolve the client name, performance is as it is supposed to be. (I Don't know if this has an impact but we have multiple nics on our citrix servers: mgmt & prod)

 

Has anyone checked if there is a host-record in DNS named "client", associated with any PC?

In our case there was such host-record. After deleting this record, the access on the mapped drives is fast again.

 

Apparently the drive mapping functionality relies on the availability of \\Client\C$ etc.

 

Regards,

Thomas

[James Hong]

HI Martin,
do you have problem on the LAN ? or are the clients connecting via WAN ?
how much latency do you see? (eg ping the server from the client pc)

copying from the client to the server wont be any faster even if you turn on the async write. this feature is to buffer WRITE to the client mapped drive, not client->server.

[Martin van der Meer]

Hi James, thanx for the answer.

I have tested it on the LAN and everything is working fast, Upload and download through a client drive is working fast.

The problem occurs when the users are on the WAN connecting for example through the Web Interface.
Uploading and downloading veryvery slow (like 1KB/sec or less). Also the window for copying process takes a long time on Calculating.....

Pinging to the server from the client results in a 9 ms.

Everything is done through a VPN connection.

When users do not use the client drive feature and just copy something to or from the server (UNC path) it works a lot faster.

Thanks in advace.

Regards

Martin van der Meer

[Terry Anderson]

We have seen issues in the past where VPN clients or firewalls incorrectly handled negotiating the MTU value at the TCP/IP level that would cause this type of behaviour. Try setting your XenApp servers to use a lower MTU value (something like 1360 instead of the default 1500) and see if this helps. This can be done via a registry setting on your XenApp servers. Google "Windows MTU" for info on the registry key to configure.

[James Hong]

I wouldnt change MTU on the server, try lowering the MTU on the client PC first.
default MTU of 1500, sometimes have issue with VPNs, but I thought most of newer VPN changes these values when they install. =(

[Martin van der Meer]

I can't see the relationship with the MTU size because it is only within a Citrix session. If a client is sending or recieving files by typing the UNC path of the server, everything works a lot faster.

I have tested with MTU 1452 on the server, but no difference.

It have to be something within Citrix or the client drive technology i think.

Regards

Martin

[Michael Manico]

Do you have a limit set to client session bandwith?

[Martin van der Meer]

No i don't have a limit for bandwith on the client drives, default there are no limits as i know.
Also on the LAN it is working fast.

[Chris Borms]

I have exact the same problem. I noticed that copying files logged on as an administrator solves the problem.
But I don't know why

[Chris Borms]

In our situation it looks like it is a DNS issue. As soon as the Citrix server is able to resolve the client name, performance is as it is supposed to be. (I Don't know if this has an impact but we have multiple nics on our citrix servers: mgmt & prod)

[JULIETA ALVAREZ]

Hi:

Anybody resolved this problem? ... I'm in the same situation until now.

Regards,
Julieta.

[David Dettmann]

I have the same issue. I would love to find documentation explaining how the citrix disk channel utilizes bandwidth. Anyone find anything on this? If I do I will post here.

[Stefan Wielers]

Same situation.
Slow up-/download to USB device (up:27 MB/min, down:22 MB/min). With RDP connection up:547 MB/Min, down:235 MB/Min.
We don't need so much, but a a litte more would be perfect. :-)
Setting Citrix policy with-/without bandwith limit and asynchron/syncron write doesn't increase the speed.
XenApp 4.5 R6 on XenServer 5.6 FP1 (Intel CPU)
Online Plug-In 12.1.0.30
internal LAN 100Mbit Client / Server: 1 GB

[Andrea BRANCALEONI]

Hi, i have same Problem:
XenApp 6.0 Server
Client Windows 2000 with Client v. 11.0.150.5357

Test:
- Same Problem in WAN & LAN (100 Mbit)!
- Copy from Local HDD (\\client\c$) to citrix session= OK! (fast)
- Copy from Local USB (\\client\d$) to citrix session = Very Slow !
- USB Formatted in Fat 32 and NTFS
- USB from Kingstone, LG, EMTEC,...
- Copy from Local PC D: to C: = very Fast (NO ICA COPY, only local)
- Ica Policy "Use Asynchrounus Write" Actiwated but Problem not solved.
- If the copy is Aborted, on Firewall i see the ICA traffic goes!

Many Thanks
Andrea

[Dustin Sterkenburg]

Same issue.....Server 2008 R2, XenApp 6.5, receiver 13.

WAN access to anything on the local machine is VERY slow (1kb/s). Eventually locks up the session and even the machine. When looking at processes on the XenApp server, the server seems to be not doing anything (CPU/Memory not doing anything).

Anyone? This is a major issue for our clients.

Thanks!
Dustin

[Patrick Schmid]

Any news about this problem?
we also have that problem with W2k8R2 and XA 6.5.

regards,

Marcel

[Scott Triston1709151941]

I too have the same issue with new Xenapp 6.5 & 2k8R2, very slow transfer speeds over a session in Malta with a local drive on the pc. Transfering 2Mb file is very hit and miss, sometimes works after 10 minutes, mostly crashes the session, even with banwidth management enabled. The still has access to our PS4.0 farm which file transfer works perfectly.

I will look into Asynchronous write policy, see if that makes any difference. Please help if anybody has managed to resolve this scenario.

[Jason Padman]

I have the same issue. W2k8R2 and XA 6.5 and i have tried both Mac & windows receiver version 13 & 12.1

I have tried direct RDP internally and the transfer is at normal speed. I have also tried the citrix policy Asynchronous write policy which made no difference.

[Scott Triston1709151941]

Looks the issue I am experiencing is related to the version of CSG (3.3) rolling back to 3.2 resolves the issue, which is related to 'cryptographic security of the SSL connection has been compromised' messages occuring exactly when users try to transfer file from server drive to local pc session drive. I will let you know the outcome post CSG downgrade to 3.2.

http://forums.citrix.com/thread.jspa?threadID=285061&start=0&tstart=0

[Dustin Sterkenburg]

I was excited when I saw this post but after some research I found we are on CSG 3.2 and still having the same issue. Has anyone tried 3.1.5?

[Richard Davenport]

We have dropped to version 3.2 of the CSG and published "Ultra Explorer" instead of Explorer.

The sessions are no longer disconnected and the transfers complete in a reasonable time.

We are running XenApp6.5 and were seeing disconnects and really slow transfer speeds between Citrix Servers in the UK and a remote users C:\ Drive in Spain.

Hope that helps - If someone else is able to test and reply back that might confirm it as a workaround?

Rob

[Dmitry Kushak]

With slow copying in Citrix sessions, and if you observe SSL errors 45 in your CSG log - please contact CTX support and request private fix 259611.

[Dustin Sterkenburg]

There is plenty of information about this issue found here:
http://forums.citrix.com/thread.jspa?threadID=285061&start=135&tstart=0

So far replacing the file sslsdk_b.dll version 12.1.5.64136 on CSG v 3.2 seems to fix XA6.0 but from my testing does NOT work with XA 6.5.

You can find that version of the file sslsdk_b.dll in the XA6.0 Rollup found here: http://support.citrix.com/article/CTX130473

If anyone can find out what is different between XA6 and XA6.5 and why XA6.5 is not working please post!

Edited by: dsterkenburg@qnectus.com on Jan 30, 2012 5:31 PM

[Bounthavy Janetvilay]

I am having this issue in XA 6.5, but no CSG involved. Just direct connection to WI server to XA servers. Copying from the client to the server is flawless, copying within XA takes 22 minutes for a 500kbs file...

[Matt Whitehouse1709152388]

I'm having this exact same issue. It seems to be more of a problem with ADSL2+ connections when uploading only.
Even just right-clicking on the file from the local client drive, takes ages to display the shortcut menu.
I'm know RDP client mapping doesn't have any problems, so why would citrix have performance problems...??

I have a XA6.0 Farm running on Windows2008R2 servers. Using a Netscaler VPX.
There must be some sort of policy clash which causes this within the citrix session.
I have 8Mbit set as a Overall session bandwidth limit and set the file redirection bandwidth to 50%.
I have tried playing with different settings in the policies, I've also enable and disabled the "Use asynchronous writes"
No luck! Best performance I get can for uploading is 1KBps

I tried the Ultra Explorer. That seemed to improve the rightclick of the files, but copying was just as slow.

I also tried disabling "Remote Differential Compression" from the Windows features on/off setting on the local windows 7 client. No Good!

Anyone know what causes this problem? Citrx are you aware of this problem??