session id contains invalid characters

[Felix Natter]

hello,

I am getting this error with php 4.4.0 (cgi mode), apache 1.3.26 on debian
woody:

[01-Nov-2005 03:31:06] PHP Warning: session_start(): The session id
contains invalid characters, valid characters are only a-z, A-Z and 0-9 in
/home/m2004018/DOMAIN.de/shop1/includes/application_top.php on line 270
[01-Nov-2005 03:31:07] PHP Warning: Unknown(): The session id contains
invalid characters, valid characters are only a-z, A-Z and 0-9 in Unknown on
line 0
[01-Nov-2005 03:31:07] PHP Warning: Unknown(): Failed to write session data
(files). Please verify that the current setting of session.save_path is
correct (/home/m2004018/tmp) in Unknown on line 0

The PHPSESSID in the browser address bar looks normal:
index.php?cPath=3&XTCsid=cdfb58872455c72c81dafa502 6e6dd92

This is an oscommerce (actually xt:commerce) shop and currently it fails to
send order-mails (to shop owner) or sends empty mails to the customer.

thank you!

--
Felix Natter