Dear Sophos Community,
I have one satrange behavior with my installation.
We have one sophos UTM up to date.
I have configured web filtering with SSO in transparent mode. Everything seems working well.
I made some tests before migration user are autehnticated and they can access the web sites according the groups they belong to.
But, some times, some users (probably the same everytime), are not well autehnticated and the web page they try to access are block.
We need to browse a new web page and then the user is authenticated.
I opened a case and we think that the issue could be a DNS issue.
I made a lot of capture and investigation but I cannot find the solution.
Did you encounter this behavior one time or maybe to you have some ideas or tests I could run to go further.
Thnaks for your help !
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