Failed to connect to database ONLY at the first time

Hi all, I installed Discoverer 10g version and I'm using an Application User to connect to the server where's the Db is installed.
Every time I try to connect to the server with Discoverer Viewer or Desktop I have a curious behavior....
ALWAYS but ONLY the first time I try to connect I have the following error :
- Failed to connect to database - Unable to connect to Oracle Applications database: invalid username/password.
If I try to re-connect again the second time it works perfectly !!....so, I think, there's nothing related with my .dbc file.
I tried also to write the ':' at the end of the user name....but it didn't work.
Into the pref.txt file doesn't exist a parameter like DefaultUserTypeIsApps to set....
Anybody have had the same "strange" behavior and found a solution or workaround ?
Thanks in advance
Alex

Thanks for your answers first of all !
At the end I found the solution looking at the Note:307167.1 on Metalink:
Discoverer Plus 10.1.2 Fails with ORA-1017 Error On First Login Attempt Then Works On Second Attempt
This note is very useful but into the solution the point 3 is not correct !
3. Modify the servername parameter to indicate the fully qualified servername.domain
Example:
An httpd.conf setting of: ServerName my_servername.mydomain.com should match a Discoverer Plus URL like http://my_servername.mydomain.com:7778/discoverer/plus
I had this problem both with Viewer and Plus...so instead to change the server name parameter (into the Apache/Apache/conf/httpd.conf file) with my complete URL (http://gnvdev.ote.gr:7779/discoverer/plus), I just write my right server name:
Example
After the installation of the Discoverer 1og server, into the httpd.conf file it was written automatyically: ServerName gnvdev
I just modified in ServerName gnvdev.ote.gr and both Viewer and Plus started to work perfectly at the first time.
I hope that this hint will be useful for you and others in the Discoverer forum !!!
Best Regards
Alex

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Thanks for your answers first of all !
At the end I found the solution looking at the Note:307167.1 on Metalink:
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After the installation of the Discoverer 1og server, into the httpd.conf file it was written automatyically: ServerName gnvdev
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