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Wednesday, November 07, 2007

Exchange 2007: POP3 ERR Command is not valid in this state

Summary: POP applications report ERR "Command is not valid in this state" after supplying credentials. To verify you try telnetting to POP port 110 of your CAS server:

Telnet CASServer 110
User Myaccount
Pass Mypass
ERR Command is not valid in this state

Resolution: Open your Exchange Shell and enter:

Set-PopSettings -LoginType PlainTextLogin

Restart your POP3 service

James Chong (MVP)
Security+, Project+, ITIL


Anonymous Anonymous said...

I got this problem when I installed the RollUp 4 update.
I tried changing login settings to plain text in the management console at first, however that didn't help.
Following your instructions solved the problem. Thanks!

3:29 AM  
Blogger nodlogin said...

Worked like a charm. Thanks!!

12:03 AM  
Blogger Basky said...

But it will no more be a secured login..

2:18 PM  
Blogger TravellerDan said...

spot on

2:07 AM  
Blogger Pragnesh said...

You are star, worked.

11:12 AM  
Anonymous Anonymous said...

Thanks for this info, I couldn't understand why this third party app would login to smtp fine but not pop3, your info sorted it.

4:29 AM  
Anonymous fiso said...

thanks a mllion worked

9:11 AM  
Anonymous Anonymous said...

Spot on....Good man

6:27 AM  
Anonymous Anonymous said...

Love your work. After I have wasted about one hour trying to get this working your post saved the day.

8:05 PM  
Anonymous Anonymous said...

It's very dangerous over Internet, without SSL!

1:43 AM  
Anonymous Cialis Online said...

I've been able to fix the problem that my computer was going through the last few weeks and that was possible only by reading this blog.

9:32 AM  
Blogger Alexis said...

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5:58 AM  
Anonymous Anonymous said...

Thank you very much, this too worked for me!

8:38 AM  
Anonymous Anonymous said...

Works perfect! Thank you.

12:39 AM  
Anonymous Anonymous said...

Thanks James - appreaciate the PS command here to get POP working properly with plain txt

12:39 PM  
Anonymous psychic said...

Such a nice blog, this is one great site that I will make sure I return, and visit again!

6:05 PM  
Anonymous Robson Barros said...

Thanks! nice job.

8:56 AM  
Anonymous Anonymous said...

Works nice! Thanks!

6:01 AM  
Anonymous Anonymous said...

You genius been battling for ages - answer was so simple.

10:11 PM  
Anonymous Anonymous said...

..or you could make sure your client uses SSL.
Like stated above, disabling SSL is not a safe option over the internet!

In outlook for example, go to account settings, 'more settings', advanced, and check 'This server requires an encrypted connection (SSL)'

1:38 AM  
Anonymous Anonymous said...

Thanks for this info!

4:33 AM  
Anonymous Anonymous said...

Thank you Sir! It worked perfectly! You Rock!

9:26 AM  
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