Fast L4 profile with xff LTM

Hello,

I have a layer 4 on F5 VS. I have set the FastL4 profile and HTTP profile as below:

ltm profile http HTTP_XforF {

 accept-xff disabled

 app-service none

 defaults-from http

 encrypt-cookies none

 enforcement {

  max-header-count 64

  max-header-size 32768

  max-requests 0

  pipeline allow

  unknown-method allow

 }

 fallback-host none

 fallback-status-codes none

 header-erase none

 header-insert none

 insert-xforwarded-for enabled

 lws-separator none

 lws-width 80

 oneconnect-transformations enabled

 proxy-type reverse

 redirect-rewrite all

 request-chunking preserve

 response-chunking selective

 response-headers-permitted none

 via-request preserve

 via-response preserve

 xff-alternative-names none

Additionally, I have 2 irule connected:

when HTTP_REQUEST {

HTTP::header insert x-forwarded-host [HTTP::host]

}

when HTTP_REQUEST {

HTTP::header insert x-forwarded-proto "https"

}

VS listens on port 443. The certificate is on the server for F5. When you try to call a host, the site is unreachable, only after a few re-invitations the site enrols the certificate and everything starts working.

When I omit F5 in communication, everything works without a problem. F5 is transparent in this case and should not cause a problem. What could be the cause of the problem?