# Connection Issue.

**URL:** <https://forums.toadworld.com/t/connection-issue/33866>\
**Category:** Toad Data Modeler\
**Created:** [August 3, 2015, 7:54am UTC](https://forums.toadworld.com/t/connection-issue/33866 "2015-08-03T07:54:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![simon.teff](https://avatars.discourse-cdn.com/v4/letter/s/8dc957/32.png) [@simon.teff](https://forums.toadworld.com/u/simon.teff)\
**Post date:** [August 3, 2015, 7:54am UTC](https://forums.toadworld.com/t/connection-issue/33866/1 "2015-08-03T07:54:43Z")

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Dear All,

I have a connection that I am using the reverse-engineer.

Using the connection details I try to connect and I get the Oracle error ‘ORA-01017: invalid username/password; logon denied’

I can logon using SQL Plus and SQL developer with the same details

I’m using ‘Connection via TCP/IP’, a host, port and a service name.

I cannot use a native client.

Could someone please advise me why this issue is occurring.

Simon.

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**Author:** ![Lukas.Knapek](https://sea1.discourse-cdn.com/quest/user_avatar/forums.toadworld.com/lukas.knapek/32/269_2.png) [@Lukas.Knapek](https://forums.toadworld.com/u/Lukas.Knapek)\
**Post date:** [August 4, 2015, 2:35am UTC](https://forums.toadworld.com/t/connection-issue/33866/2 "2015-08-04T02:35:01Z")

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Hello Simon,

A few questions:

- What is your TDM version?

- What is your Oracle version?

- In the **Connecting** section of **Reverse Engineering Wizard** , do you fill the connection details manually or choose identification from **Available Local Net Service Name** combobox?  
You might also try the following suggestions:

- Enter the database IP instead of its hostname.

- Verify that **SID** isn’t entered instead of **Service Name** and vice versa

- Try checking **Use Unicod** e option  
Regards,

Lukas