Please download and apply 
http://users.k12system.com/mrwizard/pound/pound-2.5-base64.patch.bz2

NOTE: this will add additional log messages that will include user/password 
information in your logs... but it'll also give you a better idea of what's 
going on.

I've found a couple cases where this type of error occurs:
1) A browser or server putting the base64 value in ""
2) A browser URL escaping + and / characters as %2b and %2d

This patch takes care of the second... I ran into the first only when I changed 
authentication to read a cookie, so it shouldn't be a problem for Auth Basic.  
If it is, you'll see it in the logs.

Joe


> -----Original Message-----
> From: (private) HKS [mailto:[email protected]]
> Sent: Monday, February 15, 2010 10:08 AM
> To: [email protected]
> Subject: Re: [Pound Mailing List] Can't read BIO_f_base64
>
> Upgrading to OpenBSD 4.6 and Pound 2.5 has *not* changed this behavior.
>
> -HKS
>
> On Wed, Jan 6, 2010 at 5:38 PM, (private) HKS <[email protected]>
> wrote:
> > FWIW, this is running on OpenBSD 4.4. It will be upgraded to 4.6 in
> > the coming weeks, and I'll let you know if the error persists.
> >
> > -HKS
> >
> > On Mon, Jan 4, 2010 at 11:29 AM, Robert Segall <[email protected]>
> wrote:
> >> On Mon, 2009-12-14 at 10:37 -0500, (private) HKS wrote:
> >>> This message recently began appearing in my logs. It tends to come
> in
> >>> clumps of 3-4 within a minute.
> >>>
> >>> pound: (7db89400) Can't read BIO_f_base64
> >>>
> >>> This message appears in the authorization-header-handling code if
> >>> Pound can't read the username (or something - my C skills are very
> >>> subpar). What generally causes this?
> >>
> >> I can't really imagine what the problem could be, unless you have
> >> something strange in your libraries. Anybody else seen this?
> >> --
> >> ?Robert Segall
> >> Apsis GmbH
> >> Postfach, Uetikon am See, CH-8707
> >> Tel: +41-44-920 4904
> >>
> >>
> >> --
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> >>
> >
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