Varnish 503 Error

[rabillion]

We are using IntegerNet_SansecWatch on our multistore with Hyva theme and today we installed the Basecom_CspSplitHeader module.
For the configuration we used the approximate header size, also tried lower values and as soon as we enable it, the storefront returns a Varnish 503 error.
Restarting and clearing the Varnish cache did not help. Are there any configuration rules for Varnish that are necessary?

[lsiebels]

Hi @rabillion,

you would probably have to increase the maximum allowed header size of Varnish.

Unfortunately, I don't know the name of the value that needs to be adjusted.