This bug is created as a clone of upstream ticket:
https://fedorahosted.org/freeipa/ticket/5268

VERSION: 4.2.90.201508241517GITb202afb, API_VERSION: 2.152

{{{
[root@freeipabox ~]# ipa user-add --first=Foo --last=Bar --homedir=/home/foobar --password foobar
Password: 
Enter Password again to verify: 
-------------------
Added user "foobar"
-------------------
  User login: foobar
  First name: Foo
  Last name: Bar
  Full name: Foo Bar
  Display name: Foo Bar
  Initials: FB
  Home directory: /home/foobar
  GECOS: Foo Bar
  Login shell: /bin/sh
  Kerberos principal: foobar.COM
  Email address: foobar.com
  UID: 1025000046
  GID: 1025000046
  Password: True
  Member of groups: ipausers
  Kerberos keys available: True


-sh-4.3$ whoami
foobar
-sh-4.3$ ipa vault-find
----------------
0 vaults matched
----------------
----------------------------
Number of entries returned 0
----------------------------


[root@freeipabox ~]# ipa user-del foobar
---------------------
Deleted user "foobar"
---------------------
[root@freeipabox ~]# ipa user-show foobar
ipa: ERROR: foobar: user not found
[root@freeipabox ~]# id foobar
uid=1025000046(foobar) gid=1025000046(foobar) groups=1025000046(foobar)


-sh-4.3$ ipa vault-find
ipa: ERROR: Insufficient access: SASL(-14): authorization failure: Invalid credentials
-sh-4.3$ cd
-sh-4.3$ pwd
/home/foobar
-sh-4.3$ ls
-sh-4.3$ ipa user-find
ipa: ERROR: Can't connect to server: Already connected


[root@freeipabox ~]# ipa user-find
ipa: ERROR: cannot connect to 'https://freeipabox.abc.example.com/ipa/session/json': Internal Server Error


-sh-4.3$ exit
logout
Connection to 192.168.1.1 closed.


[root@freeipabox ~]# ipa user-find
ipa: ERROR: cannot connect to 'https://freeipabox.abc.example.com/ipa/session/json': Internal Server Error
[root@freeipabox ~]# ipa vault-find
ipa: ERROR: cannot connect to 'https://freeipabox.abc.example.com/ipa/session/json': Internal Server Error
# after some time
[root@freeipabox ~]# ipa vault-find
ipa: ERROR: Can't connect to server: Already connected
[root@freeipabox ~]# ipa user-find
ipa: ERROR: Can't connect to server: Already connected
[root@freeipabox ~]# ipa config-show
ipa: ERROR: Can't connect to server: Already connected

# make it working again
[root@freeipabox ~]# systemctl restart ipa
[root@freeipabox ~]# ipa config-show
  Maximum username length: 32
  Home directory base: /home
  Default shell: /bin/sh
  Default users group: ipausers
- SNIP -
[root@freeipabox ~]# ipa vault-find
----------------
0 vaults matched
----------------
----------------------------
Number of entries returned 0
----------------------------
}}}