[Bug 3136] New: ssh RemoteForward show me "Missing target argument"

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3136

            Bug ID: 3136
           Summary: ssh RemoteForward show me "Missing target argument"
           Product: Portable OpenSSH
           Version: 8.2p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: pyygames at gmail.com

Created attachment 3368
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3368&action=edit
a sreenshot for my config and log

Env:
CentOS Linux release 7.4.1708 (Core)
OpenSSH_8.2p1, OpenSSL 1.0.2k-fips  26 Jan 2017

Issue reproduce:
step1. create a config file as bellow:
cat /etc/default/st2c2.config
Host centos2
   HostName centos2
   User user
   IdentityFile /home/user/.ssh/id_rsa
   RemoteForward 8888
   PubkeyAuthentication yes
   ServerAliveInterval 10
   ServerAliveCountMax 4
   ExitOnForwardFailure yes
   ConnectTimeout 10

step2. create a customize ssh tunnel as bellow:
cat /etc/systemd/system/st2c2.service

xxxxxx omit unit session xxxxxx
[Service]
ExecStart=/usr/bin/ssh -F /etc/default/st2c2.config -NT centos2
xxxx  omit install session xxxx

step3. systemctl start st2c2.service 

Step4. then it show me a lot of log as bellow:
Mar 15 22:43:45 centos1 systemd[1]: Started Setup a secure tunnel to
Centos2.    Mar 15 22:43:45 centos1 systemd[1]: Starting Setup a secure
tunnel to Centos2... Mar 15 22:43:45 centos1 ssh[4834]:
/etc/default/st2c2.config line 5: Missing target argument.

Step5 if I connect host in bellow way, it works well
      ssh -F /etc/default/st2c2.config centos2 

Any advise ? under command prompt, it works ,but under service ,it
always show my Missing target argument for my remote forward.

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