Re: Frequent Session is invalid or timed out- ARERR (9201) issues to Users.

[Abhijit Hendre]

Hi Madhu - I agree with problem identified by Load balancer team. Users
would get session disconnect errors when using sticky bit if that specific
mid-tier goes down. This happens to mid-tier version before 9.0

I would suggest to check with BMC on this part.

Thanks,
Abhijit H

On 2 February 2016 at 13:02, Madhu V 
wrote:

> Hi Abhijit,
>
> We have recommended the same to our Load-Balancer team and below is their
> reply. Can you please help me with your opinion on their comments.
>
> "As we verified, it is expected behavior for Cookie based persistence.
> Persistency settings are application specific and if BMC is recommending
> session stickiness for 30minutes then users session will not close for 30
> minutes and chances of unequally load distribution in case of any web
> server down. We request you please ask BMC team to share recommendation
> setting for F5 Load Balancer."
>
>
> Regards
> Madhu
>
>
>
>

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Re: Frequent Session is invalid or timed out- ARERR (9201) issues to Users.

[Abhijit Hendre]

Yes, on web facing load balancer , sticky bit should be enable. On ARS
facing load balancer sticky bit should be disable.

Thanks,
Abhijit H
On 01-Feb-2016 1:03 pm, "Madhu V" 
wrote:

> Hi Rob,
>
>
> Currently the Web facing Load Balancer is not having any session time out
> set and it is having persistence of type Cookie based. We are aware that if
> the Load Balancer has set any time out value it will be in seconds and
> should have greater value than the value set at Mid-Tier config page which
> is currently set as 20 minutes.
>
> Could you please tell us, whether do we need to set any sticky session
> value at this Web facing Load Balancer ?
>
>
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Frequent Session is invalid or timed out- ARERR (9201) issues to Users.

[Madhu V]

Hi,

Users are facing frequent session timeout issues i.e ARERR (9201) - Session is 
invalid or timed out in our Remedy Application. The issue is randomly occurring 
across all the geographies of our Organization.

Few Details:

> We are in ARS , ITSM 8.1 SP1 version. 
Midtier Version : 8.1.SP02 Patch 001 201511101452 Hotfix

> We have 8 mid-tier servers and 8 application servers (server Group 
> environment).

> Mid-tier servers and AR Servers are both load balanced (F5 Load Balancer).

> The Load Balancer which exists between the client and mid-tier servers (LB 1) 
> has a Cookie based persistence with no sticky session timeout set.

> The Load Balancer which exists between Mid-Tier Servers and AR Server (LB 2 ) 
> has no persistence type set as per the initial recommendations.

> From the Fiddler Logs captured from the affected Users, we found out that the 
> LB 1 (between client and Mid-Tier Servers) switches the users to multiple 
> Mid-Tier in very Short span and could be the reason for the session time out 
> issue.

> We have checked with our LB team along with our findings from the fiddler 
> logs. Since the issue is randomly occurring and because log size going to 
> huge size the LB team could not able to trace it from the Load Balancer side.

> The application was running fine without this issue from past 2 years. We 
> have also got a confirmation from load balancer team that there are no 
> changes taken place.

Can someone please suggest, whether the currently set configurations at Load 
balancer end are fine ?

Do we need to recommend anything to Load Balancer team? 

Please help.

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Re: Frequent Session is invalid or timed out- ARERR (9201) issues to Users.

[Rob Dudley]

I would take a look at the Timeout settings on the F5(s) in front of the
web servers. The values should match the connection timeout values in the
mid tier configuration. Remember, the F5 stores these values in seconds,
not minutes; so you'll need to adjust accordingly.
On Feb 1, 2016 1:18 AM, "Madhu V" 
wrote:

> Hi,
>
> Users are facing frequent session timeout issues i.e ARERR (9201) -
> Session is invalid or timed out in our Remedy Application. The issue is
> randomly occurring across all the geographies of our Organization.
>
> Few Details:
>
> > We are in ARS , ITSM 8.1 SP1 version.
> Midtier Version : 8.1.SP02 Patch 001 201511101452 Hotfix
>
> > We have 8 mid-tier servers and 8 application servers (server Group
> environment).
>
> > Mid-tier servers and AR Servers are both load balanced (F5 Load
> Balancer).
>
> > The Load Balancer which exists between the client and mid-tier servers
> (LB 1) has a Cookie based persistence with no sticky session timeout set.
>
> > The Load Balancer which exists between Mid-Tier Servers and AR Server
> (LB 2 ) has no persistence type set as per the initial recommendations.
>
> > From the Fiddler Logs captured from the affected Users, we found out
> that the LB 1 (between client and Mid-Tier Servers) switches the users to
> multiple Mid-Tier in very Short span and could be the reason for the
> session time out issue.
>
> > We have checked with our LB team along with our findings from the
> fiddler logs. Since the issue is randomly occurring and because log size
> going to huge size the LB team could not able to trace it from the Load
> Balancer side.
>
> > The application was running fine without this issue from past 2 years.
> We have also got a confirmation from load balancer team that there are no
> changes taken place.
>
> Can someone please suggest, whether the currently set configurations at
> Load balancer end are fine ?
>
> Do we need to recommend anything to Load Balancer team?
>
> Please help.
>
>
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Re: Frequent Session is invalid or timed out- ARERR (9201) issues to Users.

[Madhu V]

Hi Rob,


Currently the Web facing Load Balancer is not having any session time out set 
and it is having persistence of type Cookie based. We are aware that if the 
Load Balancer has set any time out value it will be in seconds and should have 
greater value than the value set at Mid-Tier config page which is currently set 
as 20 minutes. 

Could you please tell us, whether do we need to set any sticky session value at 
this Web facing Load Balancer ?

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