Intermittent problem with sessionid being invalid or too long

[cshepherd]

Hi
We are having intermittent problems when our chosen payment gatway, SagePay, passes control back to our site to finish the transaction. The error that the unlucky user gets is

"Warning: session_start() [function.session-start]: The session id is
too long or contains illegal characters, valid characters are a-z,
A-Z, 0-9 and '-,' in
/homepages/0/d165572728/htdocs/qbuster/squirrelcart/pre_common.php on
line 172"

I am new to this role and do not have aclue where to start! We are using Secure Form Transmission which I believe means that we pass a session id to SagePay so when they have finished their fionancial transaction, they pass control back to us, "quoting" the session id so we can pick it up and complete the order on our side. As we dont get a valid session id back (or we haven't sent a valid one in the first place) we cant fish the order and we lose all details. Meantime the customer has paid!

Until about a week ago the problem only happened very occasionaly but seems to be getting worse now.

Any help will be GREATLY appreciated.

Thanks
Chris

[cshepherd]

sorry SquirrelCart version is V2.3.2

[Jamie]

That is not a known problem. We would need you to open a helpdesk ticket in order for us to troubleshoot this.