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We get a few issue into support around ports required/DRS issues/NTLM versions etc when installing an SVM.
This prerequisite information is within the guides and other KBAs, however I have asked the KB team to create a standalone installation prerequisites KBA so you can quickly reference the checklist in one place.
The KBA can be found here: https://community.sophos.com/kb/en-us/133974
and it is also linked from the SVE Landing Page: https://community.sophos.com/kb/en-us/125791
Hope this helps