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SSL Client - Blue screen

Hi,

We've been having a lot of issues lately with Sophos' SSL client (as well as the OpenSSL one) on a lot of clients. 

When some people connect to the VPN, when they're at the point where the connection would be established, the computers crash and go all "BSOD" on us. 

The NDIS.sys file is at cause here but I believe it must be a conflict with something else since it is very hit and miss. The problem occurs on ~30 thinkpads (out of ~600 users), various models from T510 to T440s. Windows is up to date up some, not so much on others..) 

Mostly, I believe it is all Intel NICS for Wireless and Wired connections. we've tried old versions of Intel drivers as well as newer ones.

We also tried to update the TAP driver with no success.

The message is SYSTEM_SERVICE_EXCEPTION with a code of 0X0000003B.

Has anyone been experiencing similar issues? 

I've read there should be a new SSL client in the next UTM release but until then, I'm still trying to figure out what could cause this issue.

Thanks!


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  • Hi Scott
    Thanks for getting back to me.
    It is the same error as above (ndis.sys) but interestingly the laptops can also bluescreen with the scfndis.sys. This issue is different in that it's not happening through the sophos ssl client that I am aware of but randomly through our wifi/lan network. I am still unable to replicate the issue and as such it is still random but the fact both errors are relating to ndis.sys points to a network driver conflict? I have updated the NIC drivers to the latest intel ones but the issue is still occurring.
    Many thanks in advance
    Dan