Fixing "Authentication required, Browser session mismatch" error in Sage CRM

When logging into Sage CRM using Internet Explorer, you might encounter the following error:

Cause

This issue appears to be caused by a new security feature introduced in Sage CRM (7.3+) and appears when using Sage CRM over HTTPS.

Solution

These solutions were obtained from Sage City.

Configure Internet Explorer

The best solution would be to configure Internet Explorer to avoid the issue from appearing.

1. Open Internet Explorer and navigate to your Sage CRM instance
2. Click Close and try log in again.

Uncheck the Display intranet sites in Compatibility View and remove any CRM server hosts from the list as seen below:

Click on the Settings Icon on the top right and select Compatibility View settings

Disable the feature

Another solution could be to disable the feature entirely. This is not suggested, but if you have many users experiencing the same issue then this might be a good temporary solution so the system can still be used.

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1. Log into Sage CRM using another browser (e.g. Google Chrome)
2. Go to Administration -> System -> System Behaviour and click Change
3. Click Save to save the changes.

Change the Use browser session security field to No.

Conclusion

These are two possible solutions for the problem. I would highly suggest that you configure Internet Explorer as a permanent solution and disabling the feature as a temporary solution. If none of these solve your issue, then please do leave a comment below.

Disclaimer

I do not take any responsibility for any damage done to your system while following this guide. Be cautious and responsible when making changes to your system by making backups and ensuring that you know what consequences any actions you do will have in the system.