Forum Discussion
pjcampbell_7243
Cirrus
CirrusThe underlying connection was closed: An unexpected error occurred on a receive
I have a 2008 IIS server with .NET1.1 framework client to another 2008 server through LTM Virtual server with SSL offloading.
Whenever the .NET client tries to talk to the Virtual I get a "The ...
This was worked around by enabling the client ssl option "Don't insert empty fragments". Seems to have something to do with CBC ciphers
Apparently this option is supposed to be enabled by default but on our system it is "options none" on the default client ssl profile. I suspect it has something to do with us maintaining the same config since v7 or v8 and upgrading on top over the years to v9 v10 and then v11.
Interestingly with it breaking from v10 to v11. I still have old configs from our v10 setup and it's options none there also.... This doesn't seem to be a new option.
Since we have tried a few things already I wanted to add this as an answer too:
https://support.f5.com/csp/article/K13223
Depending on the amount of traffic to your box it might be worth trying as well.
/Patrik