I can confirm the solution from Николай Коробко. My ~/.kde/share/config/kopeterc contained the ICQVersion section, but with the following differences: Build=6059 instead of 1042 Minor=0 instead of 5 Other=30005 instead of 0
Changing the values to the suggested ones, let me connect again, so thanks a lot Николай. I have created a patch for file kdenetwork-3.5.10/kopete/protocols/oscar/oscarversionupdater.cpp (attached). Unfortunately I can't test it today, as it's still compiling, but you can give it a test as well. If the tests go fine, I think this would be appropriate for a point release.
95c95 < mICQVersion.minor = config.readEntry( "Minor", "0x0000" ).toUShort( 0, 0 ); --- > mICQVersion.minor = config.readEntry( "Minor", "0x0005" ).toUShort( 0, 0 ); 97,98c97,98 < mICQVersion.build = config.readEntry( "Build", "0x17AB" ).toUShort( 0, 0 ); < mICQVersion.other = config.readEntry( "Other", "0x00007535" ).toUInt( 0, 0 ); --- > mICQVersion.build = config.readEntry( "Build", "0x0412" ).toUShort( 0, 0 ); > mICQVersion.other = config.readEntry( "Other", "0x00000000" ).toUInt( 0, 0 );