Saving files to File Share is extremely slow

Hi All, Has any one experienced any latency to accessing files shares using ZPA? It takes up to 30 second to save 60kb file. packet captures are inconclusive.

Did you check from Zscaler client connector towards Zscaler cloud and from your App connector towards Zscaler cloud that you don’t loose packets?

Hi @sdorckel
no packet loss. from ZAPP to app Connector it take 0.30 ms to connect. rest is a mystery

You can check in ZPA logs for the specific application you access which ZPA cloud broker was used.

Can you perform MTR test from your App connector towards ZPA cloud broker and the same MTR test from your Zscaler Client connector towards ZPA cloud broker?

@sdorckel sorry. support has done win mtr. 4 week ago. still not resolved

There are 3 paths involved with ZPA, client to service edge, connector to client service edge, and connector to application.

MTR across the 3 paths is relevant.

Typically you’ll want to have pcaps connector and client side to see if the client is not getting responses back from the connector in a timely fashion or the connector from the app. You should be able to see a delay between packets if you review rtt.

This latency becomes extremely painful. it takes upto 40sec to save excel file

Dear ZsCaler community, Still not able to resolve my slow file access latency over smb2 issues. Has anyone experienced the same issue. Saving a file stored at smb network Share is extremely slow it takes upto 40seconds or more. it has been more 8 weeks now zscaler support not able to resolve this. Any help or guidance will be appreciated

Are you using smb2 or SMB3.1 as vs 3 has improvements for WAN.

Hi @FirstVoid we are using smb2. i will enable smb3 and retest it. i will post the results

Just out of curisity can you check your MTU size and the latency on the path where possible? If you have latency above 30ms then you will see huge impacts with SMB. If you test with a sharepoint (HTTPS) or onedrive you will see a huge diffrence. SMB has never been good over SMB. This is why companies like riverbed exist.

@FirstVoid Connection from my laptop to Zscaler connector is 30ms. SMB3 not impreved anything

Strange question, do you have any DLP client running next to ZCC ?
I only ask because we had fileshare slowness with 30kb files which was caused by our third party DLP solution. Might not be related but worth checking.