git push using ssh key doesn't work

[heavygit]

• Gitea version (or commit ref): 1.8.1 amd64
• Git version: 2.21.0
• Operating system: Linux / Clearlinux
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist:
  2019/05/13 22:01:54 [I] Log Mode: File(Debug)
  2019/05/13 22:01:54 [I] XORM Log Mode: File(Debug)
  2019/05/13 22:01:54 [I] Cache Service Enabled
  2019/05/13 22:01:54 [I] Session Service Enabled
  2019/05/13 22:01:54 [I] Beginning ORM engine initialization.
  2019/05/13 22:01:54 [I] ORM engine initialization attempt Rename import paths: "github.com/gogits/gogs" -> "github.com/go-gitea/gitea" #1/10...
  2019/05/13 22:01:55 [I] ORM engine initialization successful!
  2019/05/13 22:01:55 [I] Git Version: 2.21.0
  2019/05/13 22:01:55 [I] Git config user.name set to Gitea
  2019/05/13 22:01:55 [I] Git config user.email set to gitea@fake.local
  2019/05/13 22:01:55 [I] SQLite3 Supported
  2019/05/13 22:01:55 [I] Run Mode: Production
  2019/05/13 22:01:57 [I] Listen: http://0.0.0.0:3000/git
  2019/05/13 22:01:57 [I] LFS server enabled
  2019/05/13 22:03:18 [D] Session ID: 9eedf4c79329c193
  2019/05/13 22:03:18 [D] CSRF Token: nc5w1Pl_7AZxIh0SiEWWxW3Nd6w6MTU1Nzc4NDk5ODUzOTM5NzYzMA==
  2019/05/13 22:03:18 [D] Session ID: 51b2c5c937025519
  2019/05/13 22:03:18 [D] CSRF Token: PfpUkTacs2eEXdh6e390AIvYMZ86MTU1Nzc4NDk5ODYzNjQ0MjkzNg==
  2019/05/13 22:04:55 [D] Session ID: 95c6160746303dde
  2019/05/13 22:04:55 [D] CSRF Token: R72mpYeBNXFcAmxHy_0zhaerNfQ6MTU1Nzc4NTA5NTYyNzg5MjcxMQ==
  2019/05/13 22:04:55 [D] Session ID: f6b412ea8293d149
  2019/05/13 22:04:55 [D] CSRF Token: C_97jIk-Ld2Kg-d8g0xkcRFdS8w6MTU1Nzc4NTA5NTY0MTE0NzcxNw==
  2019/05/13 22:04:56 [...routers/repo/http.go:211 HTTP()] [E] invalid credentials

Description

Using gitea in combination with apache mod_proxy while using HTTPS.
"git clone" using registered ssh key for authentication works correctly.
"git push" asks for password and "http.go:211 HTTP()] [E] invalid credentials" error message is written to log file.

Screenshots

N/A

[lunny]

Did you clone and push via SSH or HTTPS ?

[heavygit]

clone and push were done via HTTPS

[zeripath]

Could you check git remote -v ensure your remotes are using SSH

Are you running LFS? Check where the LFS is set for your clone.

[heavygit]

Output from git remote -v
origin https://heavy@intlab.local/git/heavy/pokus.git (fetch)
origin https://heavy@intlab.local/git/heavy/pokus.git (push)
As I said, HTTPS was used for both of operations (clone, push).

No, LFS is not used.

[zeripath]

Ok I'm confused - your issue title says that SSH key doesn't work but you're cloning and pushing via http.

[heavygit]

No, I was confused. Of course you can use authentication using SSH keys while HTTP is being used.
The reason why clone worked is that repository hadn't been private.
Sorry guys for wasting your time.