It would appear that vault 1.7.3 from 2021Q3 is failing to fetch:

  Finished security/vault | vault-1.7.3: Failed: fetch

=> hashicorp-vault-v1.7.3_GH0.tar.gz doesn't seem to exist in /portdistfiles/.
=> Attempting to fetch https://codeload.github.com/hashicorp/vault/tar.gz/v1.7.3?dummy=/hashicorp-vault-v1.7.3_GH0.tar.gz
fetch: https://codeload.github.com/hashicorp/vault/tar.gz/v1.7.3?dummy=/hashicorp-vault-v1.7.3_GH0.tar.gz: size unknown
fetch: https://codeload.github.com/hashicorp/vault/tar.gz/v1.7.3?dummy=/hashicorp-vault-v1.7.3_GH0.tar.gz: size of remote file is not known
hashicorp-vault-v1.7.3_GH0.tar.gz                       37 MB 7788 kBps    05s
=> Fetched file size mismatch (expected 39626087, actual 39626079)
=> Trying next site
=> Attempting to fetch http://distcache.FreeBSD.org/ports-distfiles/hashicorp-vault-v1.7.3_GH0.tar.gz
fetch: http://distcache.FreeBSD.org/ports-distfiles/hashicorp-vault-v1.7.3_GH0.tar.gz: Not Found
=> Couldn't fetch it - please try to retrieve this
=> port manually into /portdistfiles/ and try again.
*** Error code 1

Stop.
make: stopped in /usr/ports/security/vault
=>> Cleaning up wrkdir
===>  Cleaning for vault-1.7.3